2-D Arrays in Java

Given the code, what is in values[2][1] ?

• 7.9

• 9.2

• 7.3

• 0.5

Given the code, what is the value of things.length ?

• 4

• 3

• 12

• 7

Given the following:

double [][] stuff ;

Which of the following statements constructs an array with 5 rows of 7 columns each and assign its reference to stuff ?

• stuff = new stuff[5][7] ;

• stuff = new double[5][7] ;

• new stuff = double[5][7] ;

• stuff = double new[5][7] ;

How would you get the value "6" out of the following array?

• a [0][3]

• a [1][3]

• c) a[0][2]

• d) a[2][0]

• e) a[3][1]

What would the statement a[1].length return?

• 3

• 4

• 2

• 1

Which of the following statements correctly declares a two-dimensional integer array?

• int Matrix[ ] = new int[5,4];

• int Matrix[ ]; Matrix = new int[5,4];

• int Matrix[ ][ ] = new int[5][4];

• int Matrix[ ][ ] = int[5][4];

How would you get the value 6 out of the following array int[][] a = {{2, 4, 6, 8}, {1, 2, 3, 4}};? Remember each set of curly braces represents a row, or a single dimensional array.

• a [0][3]

• a [1][3]

• c) a[0][2]

• d) a[2][0]

• e) a[3][1]

How many columns does a have if it is created as follows

int[][] a = {{2, 4, 6, 8}, {1, 2, 3, 4}};?

• 3

• 4

• 2

• 1

import java.util.Arrays;

public class GfG

{

public static void main(String[] args)

{

int[][] mat = new int[2][2];

mat[0][0] = 99;

mat[0][1] = 151;

mat[1][0] = 30;

mat[1][1] = 5;

System.out.println(Arrays.deepToString(mat));

}

}

• [[99, 151], [30, 5]]

• [99,30],[151,5]

• [99,151,5,30]

• Compile error

class array_output

{

public static void main(String args[])

{

int array_variable [] = new int[10];

for (int i = 0; i < 10; ++i)

{

array_variable[i] = i; System.out.print(array_variable[i] + " ");

i++;

}

}

}

• 0 2 4 6 8

• 1 3 5 7 9

• 0 1 2 3 4 5 6 7 8 9

• 1 2 3 4 5 6 7 8 9 10