Question 2: (a) Write a Java expression for the following:
(b) Write the return data type of the following functions:
- startsWith()
- random()
(c) If the value of basic=1500, what will be the value of tax after the following statement is executed?
<![CDATA[<span class="pln">
tax </span><span class="pun">=</span><span class="pln"> basic </span><span class="pun">></span><span class="pln"> </span><span class="lit">1200</span><span class="pln"> </span><span class="pun">?</span><span class="pln"> </span><span class="lit">200</span><span class="pln"> </span><span class="pun">:</span><span class="lit">100</span><span class="pun">;</span>]]>
(d) Give the output of following code and mention how many times the loop will execute?
<![CDATA[<span class="pln">
</span><span class="kwd">int</span><span class="pln"> i</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">5</span><span class="pun">;</span><span class="pln"> i</span><span class="pun">>=</span><span class="lit">1</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">if</span><span class="pun">(</span><span class="pln">i</span><span class="pun">%</span><span class="lit">2</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">
</span><span class="kwd">continue</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">i</span><span class="pun">+</span><span class="str">" "</span><span class="pun">);</span><span class="pln">
</span><span class="pun">}</span><span class="pln">
</span>]]>
(e) State a difference between call by value and call by reference.
(f) Give the output of the following:
Math.sqrt(Math.max(9,16))
(g) Write the output for the following:
<![CDATA[<span class="pln">
</span><span class="typ">String</span><span class="pln"> s1 </span><span class="pun">=</span><span class="pln"> </span><span class="str">"phoenix"</span><span class="pun">;</span><span class="pln"> </span><span class="typ">String</span><span class="pln"> s2 </span><span class="pun">=</span><span class="str">"island"</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">s1</span><span class="pun">.</span><span class="pln">substring</span><span class="pun">(</span><span class="lit">0</span><span class="pun">).</span><span class="pln">concat</span><span class="pun">(</span><span class="pln">s2</span><span class="pun">.</span><span class="pln">substring</span><span class="pun">(</span><span class="lit">2</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">s2</span><span class="pun">.</span><span class="pln">toUpperCase</span><span class="pun">());</span>]]>
(h) Evaluate the following expression if the value of x=2, y=3 and z=1.
v=x + --z + y++ + y
(i) String x[] = {"Artificial intelligence", "IOT", "Machine learning", "Big data"};
Give the output of the following statements:
- System.out.println(x[3]);
- System.out.println(x.length);
(j) What is meant by a package? Give an example.
