Java Language Fundamental - Quiz

Which one of these lists contains only Java programming language keywords?

  • Aclass, if, void, long, Int, continue
  • Bgoto, instanceof, native, finally, default, throws
  • Ctry, virtual, throw, final, volatile, transient
  • D strictfp, constant, super, implements, do

Which is a valid declarations of a String?

  • AString s1 = null;
  • BString s2 = 'null';
  • CString s3 = (String) 'abc';
  • DString s4 = (String) '\ufeed';

public class F0091 
{    
    public void main( String[] args ) 
    {  
        System.out.println( "Hello" + args[0] ); 
    } 
}
What will be the output of the program, if this code is executed with the command line: > java F0091 world

  • AHello
  • BHello Foo91
  • CHello world
  • DThe code does not run.

What will be the output of the program? 
public class TestDogs 
{
    public static void main(String [] args) 
    {
        Dog [][] theDogs = new Dog[3][];
        System.out.println(theDogs[2][0].toString());
    }
}
class Dog { }

  • Anull
  • BtheDogs
  • CCompilation fails
  • DAn exception is thrown at runtime

What will be the output of the program ? 
public class Test 
{
    public static void main(String [] args) 
    {
        signed int x = 10;
        for (int y=0; y<5; y++, x--)
            System.out.print(x + ", ");
    }
}

  • A10, 9, 8, 7, 6,
  • B9, 8, 7, 6, 5,
  • CCompilation fails.
  • DAn exception is thrown at runtime.

What will be the output of the program? 
public class CommandArgsTwo 
{
    public static void main(String [] argh) 
    {
        int x;
        x = argh.length;
        for (int y = 1; y <= x; y++) 
        {
            System.out.print(" " + argh[y]);
        }
    }
}

and the command-line invocation is

> java CommandArgsTwo 1 2 3

  • A0 1 2
  • B1 2 3
  • C0 0 0
  • DAn exception is thrown at runtime

What will be the output of the program? 
 
public class X 
{
    public static void main(String [] args) 
    {
        String names [] = new String[5];
        for (int x=0; x < args.length; x++)
            names[x] = args[x];
        System.out.println(names[2]);
    }
}

and the command line invocation is

  • Anames
  • Bnull
  • CCompilation fails
  • DAn exception is thrown at runtime

Size of int in Java is

  • A16 bit
  • B32 bit
  • C64 bit
  • DDepends on execution environment

Number of primitive data types in Java are?

  • A2
  • B4
  • C10
  • D8

What will be the output of the program? 

class MCQ
{
	public static void main(String args[])
	{
		MCQ mcq = new MCQ();
		mcq.test(12);
	}

	void test(int n){

		for (int x = 1; x <= n; x++)
		if(n%x == 0)
			System.out.print(x+" ");
	}
}

  • A1 2 3 4 6 12
  • B1 2 3 4 5 6 12
  • C1 2 3 4 6 7 12
  • D1 2 3 4 6 12 14

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