Java Quiz

Array is

• immutable

• mutable

• always contant

Which of the following declares an array of int named img?

• int img;

• int[] img;

• new int img[];

• int img = int[];

What are the legal indexes for the array ar, given the following declaration:

int[] ar = {2, 4, 6, 8 };

• 0, 1, 2, 3

• 1, 2, 3, 4

• 2, 4, 6, 8

• 0, 2, 4. 6

What is the output of the following code fragment:

int[] ar = {2, 4, 6, 8 };

System.out.println( ar[0] + " " + ar[1] );

• 2 6

• 8

• 2 4

• 6 8

What is the output of the following code fragment:

int[] ar = {2, 4, 6, 8 };

ar[0] = 23;

ar[3] = ar[1];

System.out.println( ar[0] + " " + ar[3] );

• 23 2

• 2 8

• 31

• 23 4

What is the output of the following code fragment:

int[] y = new int[5];

y[0] = 34;

y[1] = 88;

System.out.println( y[0] + " " + y[1] + " " + y[5] );

• 34 88 0

• 34 88 88

• The program is defective and will not compile

• 0 34 88

What is the output of the following code fragment:

int[] z = new int[9];

z[0] = 7;

z[1] = 3;

z[2] = 4;

System.out.println( z[0] + z[1] + " " + z[5] );

• 10 0

• 7 3 0

• The program is defective and will not compile.

• 7 3 4

What is the output of the following code fragment:

int[] zip = new int[5];

zip[0] = 7;

zip[1] = 3;

zip[2] = 4;

zip[3] = 1;

zip[4] = 9;

System.out.println( zip[ 2 + 1 ] );

• 4 3

• 3

• 4

• 1

What is the output of the following code fragment:

int[] zip = new int[5];

zip[0] = 7;

zip[1] = 3;

zip[2] = 4;

zip[3] = 1;

zip[4] = 9;

int j = 3;

System.out.println( zip[ j-1 ] );

• 7

• 3

• 4

• 1

How many objects are present after the following code fragment has executed?

double[] ann = new double[ 7 ];

double[] bob;

bob = ann;

• 2

• 7

• 14

• 1