Two Dimensional Array in Java: Usage and Examples
☰Fullscreen
Table of Content:
- Syntax to Declare Multidimensional Array in java
- Initialization with Values:
- Example of 2D Array
- Initializing with Values Directly
- Example of Multidimensional java array
- Java Programming Code for Two Dimensional (2D) Array
- Addition of two matrices in java
- Program to multiply two matrices
- Related Questions
- Related Assignment
- Stay Ahead of the Curve! Check out these trending topics and sharpen your skills.
A multi-dimensional array is very much similar to a single dimensional array. It can have multiple rows and multiple columns unlike single dimensional array, which can have only one full row or one full column.
Syntax to Declare Multidimensional Array in java
datatype[][] identifier; dataType[][] arrayName;
or
datatype identifier[][];
Instantiation
<span class="pln"> arrayName </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> dataType</span><span class="pun">[</span><span class="pln">rows</span><span class="pun">][</span><span class="pln">columns</span><span class="pun">];</span>
Combined Declaration and Instantiation
<span class="pln"> dataType</span><span class="pun">[][]</span><span class="pln"> arrayName </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> dataType</span><span class="pun">[</span><span class="pln">rows</span><span class="pun">][</span><span class="pln">columns</span><span class="pun">];</span><span class="pln"> </span>
Initialization with Values:
<span class="pln"> dataType</span><span class="pun">[][]</span><span class="pln"> arrayName </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="pun">{</span><span class="pln">value1</span><span class="pun">,</span><span class="pln"> value2</span><span class="pun">,</span><span class="pln"> value3</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="pln">value4</span><span class="pun">,</span><span class="pln"> value5</span><span class="pun">,</span><span class="pln"> value6</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="pln">value7</span><span class="pun">,</span><span class="pln"> value8</span><span class="pun">,</span><span class="pln"> value9</span><span class="pun">}</span><span class="pln"> </span><span class="pun">};</span><span class="pln"> </span>
Example of 2D Array
Declaring and Initializing with Default Values
<span class="pln"> </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">Main</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pun">[]</span><span class="pln"> args</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="com">// Declaring and Instantiating</span><span class="pln"> </span><span class="kwd">int</span><span class="pun">[][]</span><span class="pln"> array </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="kwd">int</span><span class="pun">[</span><span class="lit">3</span><span class="pun">][</span><span class="lit">3</span><span class="pun">];</span><span class="pln"> </span><span class="com">// Filling values</span><span class="pln"> array</span><span class="pun">[</span><span class="lit">0</span><span class="pun">][</span><span class="lit">0</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="lit">1</span><span class="pun">;</span><span class="pln"> array</span><span class="pun">[</span><span class="lit">0</span><span class="pun">][</span><span class="lit">1</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="lit">2</span><span class="pun">;</span><span class="pln"> array</span><span class="pun">[</span><span class="lit">0</span><span class="pun">][</span><span class="lit">2</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="lit">3</span><span class="pun">;</span><span class="pln"> array</span><span class="pun">[</span><span class="lit">1</span><span class="pun">][</span><span class="lit">0</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="lit">4</span><span class="pun">;</span><span class="pln"> array</span><span class="pun">[</span><span class="lit">1</span><span class="pun">][</span><span class="lit">1</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="lit">5</span><span class="pun">;</span><span class="pln"> array</span><span class="pun">[</span><span class="lit">1</span><span class="pun">][</span><span class="lit">2</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="lit">6</span><span class="pun">;</span><span class="pln"> array</span><span class="pun">[</span><span class="lit">2</span><span class="pun">][</span><span class="lit">0</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="lit">7</span><span class="pun">;</span><span class="pln"> array</span><span class="pun">[</span><span class="lit">2</span><span class="pun">][</span><span class="lit">1</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="lit">8</span><span class="pun">;</span><span class="pln"> array</span><span class="pun">[</span><span class="lit">2</span><span class="pun">][</span><span class="lit">2</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="lit">9</span><span class="pun">;</span><span class="pln"> </span><span class="com">// Printing the array</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">int</span><span class="pln"> i </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln"> i </span><span class="pun"><</span><span class="pln"> </span><span class="lit">3</span><span class="pun">;</span><span class="pln"> i</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">int</span><span class="pln"> j </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln"> j </span><span class="pun"><</span><span class="pln"> </span><span class="lit">3</span><span class="pun">;</span><span class="pln"> j</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">array</span><span class="pun">[</span><span class="pln">i</span><span class="pun">][</span><span class="pln">j</span><span class="pun">]</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="str">" "</span><span class="pun">);</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">();</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span>
Output:
<span class="pln"> </span><span class="lit">1</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="lit">3</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="lit">5</span><span class="pln"> </span><span class="lit">6</span><span class="pln"> </span><span class="lit">7</span><span class="pln"> </span><span class="lit">8</span><span class="pln"> </span><span class="lit">9</span><span class="pln"> </span>
Initializing with Values Directly
<span class="pln"> </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">Main</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pun">[]</span><span class="pln"> args</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">int</span><span class="pun">[][]</span><span class="pln"> array </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="pun">{</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="lit">2</span><span class="pun">,</span><span class="pln"> </span><span class="lit">3</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">4</span><span class="pun">,</span><span class="pln"> </span><span class="lit">5</span><span class="pun">,</span><span class="pln"> </span><span class="lit">6</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">7</span><span class="pun">,</span><span class="pln"> </span><span class="lit">8</span><span class="pun">,</span><span class="pln"> </span><span class="lit">9</span><span class="pun">}</span><span class="pln"> </span><span class="pun">};</span><span class="pln"> </span><span class="com">// Printing the array</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">int</span><span class="pun">[]</span><span class="pln"> row </span><span class="pun">:</span><span class="pln"> array</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="kwd">int</span><span class="pln"> </span><span class="kwd">value</span><span class="pln"> </span><span class="pun">:</span><span class="pln"> row</span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="kwd">print</span><span class="pun">(</span><span class="kwd">value</span><span class="pln"> </span><span class="pun">+</span><span class="pln"> </span><span class="str">" "</span><span class="pun">);</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">();</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span>
Output:
<span class="pln"> </span>
Example of Multidimensional java array
Program: Let's see the simple example to declare, instantiate, initialize and print the 2Dimensional array.
class Arrayxample{ public static void main(String args[]){ //declaring and initializing 2D array int arr[][]={{1,2,3},{2,4,5},{4,4,5}}; //printing 2D array for(int i=0;i<3;i++){ for(int j=0;j<3;j++){ System.out.print(arr[i][j]+" "); } System.out.print("\n"); } } }
Output:
1 2 3 2 4 5 4 4 5 Press any key to continue . . .
Java Programming Code for Two Dimensional (2D) Array
Following Java Program ask to the user to enter row and column size of the array then ask to the user to enter the array elements, and the program will display the two dimensional array:
<span class="pln"> </span><span class="com">/* Java Program Example - Two Dimensional Array */</span><span class="pln"> </span><span class="kwd">import</span><span class="pln"> java</span><span class="pun">.</span><span class="pln">util</span><span class="pun">.</span><span class="typ">Scanner</span><span class="pun">;</span><span class="pln"> </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">JavaProgram</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pln"> args</span><span class="pun">[])</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> row</span><span class="pun">,</span><span class="pln"> col</span><span class="pun">,</span><span class="pln"> i</span><span class="pun">,</span><span class="pln"> j</span><span class="pun">;</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> arr</span><span class="pun">[][]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="kwd">int</span><span class="pun">[</span><span class="lit">10</span><span class="pun">][</span><span class="lit">10</span><span class="pun">];</span><span class="pln"> </span><span class="typ">Scanner</span><span class="pln"> scan </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">Scanner</span><span class="pun">(</span><span class="typ">System</span><span class="pun">.</span><span class="kwd">in</span><span class="pun">);</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"Enter Number of Row for Array (max 10) : "</span><span class="pun">);</span><span class="pln"> row </span><span class="pun">=</span><span class="pln"> scan</span><span class="pun">.</span><span class="pln">nextInt</span><span class="pun">();</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"Enter Number of Column for Array (max 10) : "</span><span class="pun">);</span><span class="pln"> col </span><span class="pun">=</span><span class="pln"> scan</span><span class="pun">.</span><span class="pln">nextInt</span><span class="pun">();</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Enter "</span><span class="pln"> </span><span class="pun">+(</span><span class="pln">row</span><span class="pun">*</span><span class="pln">col</span><span class="pun">)+</span><span class="pln"> </span><span class="str">" Array Elements : "</span><span class="pun">);</span><span class="pln"> </span><span class="kwd">for</span><span class="pun">(</span><span class="pln">i</span><span class="pun">=</span><span class="lit">0</span><span class="pun">;</span><span class="pln"> i</span><span class="pun"><</span><span class="pln">row</span><span class="pun">;</span><span class="pln"> i</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">for</span><span class="pun">(</span><span class="pln">j</span><span class="pun">=</span><span class="lit">0</span><span class="pun">;</span><span class="pln"> j</span><span class="pun"><</span><span class="pln">col</span><span class="pun">;</span><span class="pln"> j</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> arr</span><span class="pun">[</span><span class="pln">i</span><span class="pun">][</span><span class="pln">j</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> scan</span><span class="pun">.</span><span class="pln">nextInt</span><span class="pun">();</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"The Array is :\n"</span><span class="pun">);</span><span class="pln"> </span><span class="kwd">for</span><span class="pun">(</span><span class="pln">i</span><span class="pun">=</span><span class="lit">0</span><span class="pun">;</span><span class="pln"> i</span><span class="pun"><</span><span class="pln">row</span><span class="pun">;</span><span class="pln"> i</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">for</span><span class="pun">(</span><span class="pln">j</span><span class="pun">=</span><span class="lit">0</span><span class="pun">;</span><span class="pln"> j</span><span class="pun"><</span><span class="pln">col</span><span class="pun">;</span><span class="pln"> j</span><span class="pun">++)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">arr</span><span class="pun">[</span><span class="pln">i</span><span class="pun">][</span><span class="pln">j</span><span class="pun">]+</span><span class="pln"> </span><span class="str">" "</span><span class="pun">);</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">();</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span>
Output
When the above Java Program is compile and executed, it will produce the following output:
Enter Number of Row for Array (max 10) : 3 Enter Number of Column for Array (max 10) : 3 Enter 9 Array Elements : 1 2 3 4 5 6 7 8 9 The Array is : 1 2 3 4 5 6 7 8 9 Press any key to continue . . .
Addition of two matrices in java
Program: Let's see a simple example that adds two matrices.
class ArrayEx{ public static void main(String args[]){ //creating two matrices int a[][]={{2,4,6},{3,4,5}}; int b[][]={{7,1,2},{2,1,5}}; //creating another matrix to store the sum of two matrices int c[][]=new int[2][3]; //adding and printing addition of two matrices for(int i=0;i<2;i++){ for(int j=0;j<3;j++){ c[i][j]=a[i][j]+b[i][j]; System.out.print(c[i][j]+" "); } System.out.println();//new line } } }
Output:
9 5 8 5 5 10 Press any key to continue . . .
Program to multiply two matrices
Program: Let's see a simple example that multiply two matrices.
This java program multiply two matrices. Before multiplication matrices are checked whether they can be multiplied or not.
<span class="pln"> </span><span class="kwd">import</span><span class="pln"> java</span><span class="pun">.</span><span class="pln">util</span><span class="pun">.</span><span class="typ">Scanner</span><span class="pun">;</span><span class="pln"> </span><span class="kwd">class</span><span class="pln"> </span><span class="typ">MatrixMultiplication</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">public</span><span class="pln"> </span><span class="kwd">static</span><span class="pln"> </span><span class="kwd">void</span><span class="pln"> main</span><span class="pun">(</span><span class="typ">String</span><span class="pln"> args</span><span class="pun">[])</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> m</span><span class="pun">,</span><span class="pln"> n</span><span class="pun">,</span><span class="pln"> p</span><span class="pun">,</span><span class="pln"> q</span><span class="pun">,</span><span class="pln"> sum </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">,</span><span class="pln"> c</span><span class="pun">,</span><span class="pln"> d</span><span class="pun">,</span><span class="pln"> k</span><span class="pun">;</span><span class="pln"> </span><span class="typ">Scanner</span><span class="pln"> </span><span class="kwd">in</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="typ">Scanner</span><span class="pun">(</span><span class="typ">System</span><span class="pun">.</span><span class="kwd">in</span><span class="pun">);</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Enter the number of rows and columns of first matrix"</span><span class="pun">);</span><span class="pln"> m </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">in</span><span class="pun">.</span><span class="pln">nextInt</span><span class="pun">();</span><span class="pln"> n </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">in</span><span class="pun">.</span><span class="pln">nextInt</span><span class="pun">();</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> first</span><span class="pun">[][]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="kwd">int</span><span class="pun">[</span><span class="pln">m</span><span class="pun">][</span><span class="pln">n</span><span class="pun">];</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Enter the elements of first matrix"</span><span class="pun">);</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> c </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> c </span><span class="pun"><</span><span class="pln"> m </span><span class="pun">;</span><span class="pln"> c</span><span class="pun">++</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> d </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> d </span><span class="pun"><</span><span class="pln"> n </span><span class="pun">;</span><span class="pln"> d</span><span class="pun">++</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> first</span><span class="pun">[</span><span class="pln">c</span><span class="pun">][</span><span class="pln">d</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">in</span><span class="pun">.</span><span class="pln">nextInt</span><span class="pun">();</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Enter the number of rows and columns of second matrix"</span><span class="pun">);</span><span class="pln"> p </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">in</span><span class="pun">.</span><span class="pln">nextInt</span><span class="pun">();</span><span class="pln"> q </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">in</span><span class="pun">.</span><span class="pln">nextInt</span><span class="pun">();</span><span class="pln"> </span><span class="kwd">if</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> n </span><span class="pun">!=</span><span class="pln"> p </span><span class="pun">)</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Matrices with entered orders can't be multiplied with each other."</span><span class="pun">);</span><span class="pln"> </span><span class="kwd">else</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> second</span><span class="pun">[][]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="kwd">int</span><span class="pun">[</span><span class="pln">p</span><span class="pun">][</span><span class="pln">q</span><span class="pun">];</span><span class="pln"> </span><span class="kwd">int</span><span class="pln"> multiply</span><span class="pun">[][]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">new</span><span class="pln"> </span><span class="kwd">int</span><span class="pun">[</span><span class="pln">m</span><span class="pun">][</span><span class="pln">q</span><span class="pun">];</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Enter the elements of second matrix"</span><span class="pun">);</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> c </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> c </span><span class="pun"><</span><span class="pln"> p </span><span class="pun">;</span><span class="pln"> c</span><span class="pun">++</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> d </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> d </span><span class="pun"><</span><span class="pln"> q </span><span class="pun">;</span><span class="pln"> d</span><span class="pun">++</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> second</span><span class="pun">[</span><span class="pln">c</span><span class="pun">][</span><span class="pln">d</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> </span><span class="kwd">in</span><span class="pun">.</span><span class="pln">nextInt</span><span class="pun">();</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> c </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> c </span><span class="pun"><</span><span class="pln"> m </span><span class="pun">;</span><span class="pln"> c</span><span class="pun">++</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> d </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> d </span><span class="pun"><</span><span class="pln"> q </span><span class="pun">;</span><span class="pln"> d</span><span class="pun">++</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> k </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> k </span><span class="pun"><</span><span class="pln"> p </span><span class="pun">;</span><span class="pln"> k</span><span class="pun">++</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> sum </span><span class="pun">=</span><span class="pln"> sum </span><span class="pun">+</span><span class="pln"> first</span><span class="pun">[</span><span class="pln">c</span><span class="pun">][</span><span class="pln">k</span><span class="pun">]*</span><span class="pln">second</span><span class="pun">[</span><span class="pln">k</span><span class="pun">][</span><span class="pln">d</span><span class="pun">];</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> multiply</span><span class="pun">[</span><span class="pln">c</span><span class="pun">][</span><span class="pln">d</span><span class="pun">]</span><span class="pln"> </span><span class="pun">=</span><span class="pln"> sum</span><span class="pun">;</span><span class="pln"> sum </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pun">;</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="pln">println</span><span class="pun">(</span><span class="str">"Product of entered matrices:-"</span><span class="pun">);</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> c </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> c </span><span class="pun"><</span><span class="pln"> m </span><span class="pun">;</span><span class="pln"> c</span><span class="pun">++</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> </span><span class="pun">(</span><span class="pln"> d </span><span class="pun">=</span><span class="pln"> </span><span class="lit">0</span><span class="pln"> </span><span class="pun">;</span><span class="pln"> d </span><span class="pun"><</span><span class="pln"> q </span><span class="pun">;</span><span class="pln"> d</span><span class="pun">++</span><span class="pln"> </span><span class="pun">)</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="kwd">print</span><span class="pun">(</span><span class="pln">multiply</span><span class="pun">[</span><span class="pln">c</span><span class="pun">][</span><span class="pln">d</span><span class="pun">]+</span><span class="str">"\t"</span><span class="pun">);</span><span class="pln"> </span><span class="typ">System</span><span class="pun">.</span><span class="kwd">out</span><span class="pun">.</span><span class="kwd">print</span><span class="pun">(</span><span class="str">"\n"</span><span class="pun">);</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span><span class="pun">}</span><span class="pln"> </span>
Output:
Enter the number of rows and columns of first matrix 3 3 Enter the elements of first matrix 1 2 3 4 5 6 7 8 9 Enter the number of rows and columns of second matrix 3 3 Enter the elements of second matrix 9 8 7 6 5 4 3 2 1 Product of entered matrices:- 30 24 18 84 69 54 138 114 90 Press any key to continue . . .
- Question 1:
Declare a 2D array of integers in Java with 3 rows and 4 columns. Initialize the array with the following values:
<span class="pln"> </span><span class="lit">1</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="lit">3</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="lit">5</span><span class="pln"> </span><span class="lit">6</span><span class="pln"> </span><span class="lit">7</span><span class="pln"> </span><span class="lit">8</span><span class="pln"> </span><span class="lit">9</span><span class="pln"> </span><span class="lit">10</span><span class="pln"> </span><span class="lit">11</span><span class="pln"> </span><span class="lit">12</span> - Question 2:
Given the following 2D array:
<span class="pln"> </span><span class="kwd">int</span><span class="pun">[][]</span><span class="pln"> matrix </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="pun">{</span><span class="lit">5</span><span class="pun">,</span><span class="pln"> </span><span class="lit">8</span><span class="pun">,</span><span class="pln"> </span><span class="lit">3</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">4</span><span class="pun">,</span><span class="pln"> </span><span class="lit">9</span><span class="pun">,</span><span class="pln"> </span><span class="lit">7</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">6</span><span class="pun">,</span><span class="pln"> </span><span class="lit">2</span><span class="pun">,</span><span class="pln"> </span><span class="lit">1</span><span class="pun">}</span><span class="pln"> </span><span class="pun">};</span><span class="pln"> </span> Write a program to display the element at the second row, third column.
- Question 3:
Write a Java program to calculate and print the sum of all elements in the following 2D array:
<span class="pln"> </span><span class="kwd">int</span><span class="pun">[][]</span><span class="pln"> arr </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="pun">{</span><span class="lit">2</span><span class="pun">,</span><span class="pln"> </span><span class="lit">4</span><span class="pun">,</span><span class="pln"> </span><span class="lit">6</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="lit">3</span><span class="pun">,</span><span class="pln"> </span><span class="lit">5</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">7</span><span class="pun">,</span><span class="pln"> </span><span class="lit">8</span><span class="pun">,</span><span class="pln"> </span><span class="lit">9</span><span class="pun">}</span><span class="pln"> </span><span class="pun">};</span><span class="pln"> </span> - Question 4:
Write a Java program that takes a 2D array of size
2x3and returns its transpose.<span class="pln"> </span><span class="lit">1</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="lit">3</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="lit">5</span><span class="pln"> </span><span class="lit">6</span><span class="pln"> </span> Output:
<span class="pln"> </span><span class="lit">1</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="lit">5</span><span class="pln"> </span><span class="lit">3</span><span class="pln"> </span><span class="lit">6</span><span class="pln"> </span> - Question 5:
Write a Java program to search for a specific element in a 2D array and print its position (row and column index). If the element is not found, print a message indicating that the element was not found.
Given the following 2D array:
<span class="pln"> </span><span class="kwd">int</span><span class="pun">[][]</span><span class="pln"> arr </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="pun">{</span><span class="lit">5</span><span class="pun">,</span><span class="pln"> </span><span class="lit">7</span><span class="pun">,</span><span class="pln"> </span><span class="lit">9</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">4</span><span class="pun">,</span><span class="pln"> </span><span class="lit">6</span><span class="pun">,</span><span class="pln"> </span><span class="lit">8</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="lit">2</span><span class="pun">,</span><span class="pln"> </span><span class="lit">3</span><span class="pun">}</span><span class="pln"> </span><span class="pun">};</span><span class="pln"> </span> - Question 6:
Write a Java program that calculates the sum of each row in a 2D array and prints the result.
Given the following array:
<span class="pln"> </span><span class="kwd">int</span><span class="pun">[][]</span><span class="pln"> arr </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="pun">{</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="lit">2</span><span class="pun">,</span><span class="pln"> </span><span class="lit">3</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">4</span><span class="pun">,</span><span class="pln"> </span><span class="lit">5</span><span class="pun">,</span><span class="pln"> </span><span class="lit">6</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">7</span><span class="pun">,</span><span class="pln"> </span><span class="lit">8</span><span class="pun">,</span><span class="pln"> </span><span class="lit">9</span><span class="pun">}</span><span class="pln"> </span><span class="pun">};</span><span class="pln"> </span> - Question 7:
Write a Java program that prints the diagonal elements of a square 2D array.
Given the following array:
<span class="pln"> </span><span class="kwd">int</span><span class="pun">[][]</span><span class="pln"> matrix </span><span class="pun">=</span><span class="pln"> </span><span class="pun">{</span><span class="pln"> </span><span class="pun">{</span><span class="lit">1</span><span class="pun">,</span><span class="pln"> </span><span class="lit">2</span><span class="pun">,</span><span class="pln"> </span><span class="lit">3</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">4</span><span class="pun">,</span><span class="pln"> </span><span class="lit">5</span><span class="pun">,</span><span class="pln"> </span><span class="lit">6</span><span class="pun">},</span><span class="pln"> </span><span class="pun">{</span><span class="lit">7</span><span class="pun">,</span><span class="pln"> </span><span class="lit">8</span><span class="pun">,</span><span class="pln"> </span><span class="lit">9</span><span class="pun">}</span><span class="pln"> </span><span class="pun">};</span><span class="pln"> </span> - Question 8:
Write a Java program to multiply two matrices. Ensure that the number of columns in the first matrix is equal to the number of rows in the second matrix.
Given matrices:
Matrix A (2x3):
<span class="pln"> </span><span class="lit">1</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="lit">3</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="lit">5</span><span class="pln"> </span><span class="lit">6</span><span class="pln"> </span> Matrix B (3x2):
<span class="pln"> </span><span class="lit">7</span><span class="pln"> </span><span class="lit">8</span><span class="pln"> </span><span class="lit">9</span><span class="pln"> </span><span class="lit">10</span><span class="pln"> </span><span class="lit">11</span><span class="pln"> </span><span class="lit">12</span><span class="pln"> </span> - Question 9:
Write a Java program to sort each row of the following 2D array in ascending order.
Example Input:
<span class="pln"> </span><span class="lit">9</span><span class="pln"> </span><span class="lit">7</span><span class="pln"> </span><span class="lit">5</span><span class="pln"> </span><span class="lit">3</span><span class="pln"> </span><span class="lit">1</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="lit">6</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="lit">8</span><span class="pln"> </span> Expected Output:
<span class="pln"> </span><span class="lit">5</span><span class="pln"> </span><span class="lit">7</span><span class="pln"> </span><span class="lit">9</span><span class="pln"> </span><span class="lit">1</span><span class="pln"> </span><span class="lit">2</span><span class="pln"> </span><span class="lit">3</span><span class="pln"> </span><span class="lit">4</span><span class="pln"> </span><span class="lit">6</span><span class="pln"> </span><span class="lit">8</span><span class="pln"> </span> - Question 10:
(ix)
(a) Write the Java statement to initialize the first 6 odd numbers in a 3 × 2 array.(b) What is the result of
x[0][1] + x[2][1]of the above array?
Related Questions
- Assignment 1: Example of Multidimensional java array
- Assignment 2: Java Programming Code for Two Dimensional (2D) Array