Java Output Questions set - 2

Set -2

1)class Output

{

    final static short i = 2;

    public static int j = 0;

    public static void main(String [] args)

    {

        for (int k = 0; k < 3; k++)

        {

            switch (k)

            {

                case i: System.out.print(" 0 ");

                case i-1: System.out.print(" 1 ");

                case i-2: System.out.print(" 2 ");

            }

        }

    }

}

A.210100

B.012122

C.212012

D.012

E.Compile error

2)public class Final

{

    final int assign;

    public static void main(String[] args)

    {

        final int result = 20;

        Final f = new Final();

        f.assign = process(result);

        System.out.println(f.assign);

    }

    final static int process(int a)

    {

        return a + 5;

    }

}

A.20

B.25

C.Compile Error

D.Runtime Error

3)String x = new String("xyz");

String y = "abc";

x = x + y;

How many String objects have been created?

A. 2

B. 3

C. 4

D. 5

4)public class ObjComp

{

    public static void main(String [] args )

    {

        int result = 0;

        ObjComp oc = new ObjComp();

        Object o = oc;

        if (o == oc)

            result = 1;

        if (o != oc)

            result = result + 10;

        if (o.equals(oc) )

            result = result + 100;

        if (oc.equals(o) )

            result = result + 1000;

        System.out.println("result = " + result);

    }

}

A. 1

B. 10

C. 101

D. 1101

5)public class Example

{

    public static void main(String [] args)

    {

        double values[] = {-2.3, -1.0, 0.25, 4};

        int cnt = 0;

        for (int x=0; x < values.length; x++)

        {

            if (Math.round(values[x] + .5) == Math.ceil(values[x]))

            {

                ++cnt;

            }

        }

        System.out.println("same results " + cnt + " time(s)");

    }

}

A. same results 0 time(s)

B. same results 2 time(s)

C. same results 4 time(s)

D. Compilation fails.

6)try

{

    Float f1 = new Float("3.0");

    int x = f1.intValue();

    byte b = f1.byteValue();

    double d = f1.doubleValue();

    System.out.println(x + b + d);

}

catch (NumberFormatException e) /* Line 9 */

{

    System.out.println("bad number"); /* Line 11 */

}

A. 9.0

B. bad number

C. Compilation fails on line 9.

D. Compilation fails on line 11.

7)String s = "ABC";

s.toLowerCase();

s += "def";

System.out.println(s);

A. ABC

B. abc

C. ABCdef

D. Compile Error

8)class Tree { }

class Pine extends Tree { }

class Oak extends Tree { }

public class Forest1

{

    public static void main (String [] args)

    {

        Tree tree = new Pine();

        if( tree instanceof Pine )

            System.out.println ("Pine");

        else if( tree instanceof Tree )

            System.out.println ("Tree");

        else if( tree instanceof Oak )

            System.out.println ( "Oak" );

        else

            System.out.println ("Oops ");

    }

}

A. Pine

B. Tree

C. Forest

D. Oops

9)

String a = "newspaper";

a = a.substring(5,7);

char b = a.charAt(1);

a = a + b;

System.out.println(a);

A. apa

B. app

C. apea

D. apep

10)class MainClass

{

 public static void main(String arg[])

 {

  int arr[][]={{4,3},{2,1}};

  int i,j;

  for(i=1;i>-1;i--)

  {

   for(j=1;j>-1;j--)

   {

    System.out.print(arr[i][j]);

   }

  }

 }

}

A.1234

B.12

C.34

D.1245