Arrays

Is String a primitive data type?

• Yes

• No

• Both

Which method to use to find length of an array?

• length

• size

• long

• count

int[] myArray = {11, 22, 33, 44, 55};

which code is correct to print length of above int-array?

• System.out.println(int[].myArray.length());

• System.out.println(myArray.length);

• System.out.println(myArray.length());

• System.out.println(int[].myArray.size());

String[] friends = {"John", "Mike", "Samantha", "Monica"};

which code is correct to print "Samantha" using array functionality?

• System.out.println(friends[2]);

• System.out.println(friends[3]);

• System.out.println(friends["Samantha"]);

• System.out.println(friends{2});

Select correct code to create an array of "double" datatype of length 5.

• double arr = double[5];

• double{} arr = new double{5};

• double[5] arr = new double[];

• double[] arr = new double[5];

What is the correct relation between length and last-index of array?

• last-index is always 1 more than the length

• last-index is 1 less than the length (but not always)

• last-index is always 1 less than the length

• last-index is always equal to the length

Consider the following code segment.

int[]arr={1, 2, 3, 4, 5, 6, 7};

for(int k=3; k<arr.length-1;k++) {

Arr[k]=arr[k+1];

}

Which of the following represents the contents of arr as a result of executing the code segment?

• {1, 2, 3, 4, 5, 6,7}

• {1, 2, 3, 5, 6,7}

• {1, 2, 3, 5, 6, 7,7}

• {1, 2, 3, 5, 6, 7,8}

• {2, 3, 4, 5, 6, 7,7}

A two-dimensional array arr is to be created with the following contents.

boolean[][] arr = {{false, true,false},

{false, false, true}};

Which of the following code segments can be used to correctly create and initialize arr in another way?

I. boolean arr[][] = new boolean[2][3];

arr[0][1] =true;

arr[1][2] = true;

II. boolean arr[][] = newboolean[2][3];

arr[1][2] =true;

arr[2][3] = true;

III. boolean arr[][] = newboolean[3][2];

arr[0][1] =true;

arr[1][2] = true;

• I only

• II only

• III only

• I and II only

• I and III only

Consider the following code segment.

int[] oldArray = {1, 2, 3, 4, 5, 6, 7, 8, 9}; int[][] newArray = newint[3][3];

int row = 0; int col = 0;

for (int index = 0; index < oldArray.length; index++) { newArray[row][col] = oldArray[index];

row++;

if ((row % 3) == 0){ col++;

row = 0;

}

}

System.out.println(newArray[0][2]);

What is printed as a result of executing the code segment?

• 3

• 4

• 5

• 7

• 8

Consider the following code segment

int[][] arr = {{6, 2, 5, 7},{7, 6, 1, 2}};

for (int j = 0; j < arr.length;j++){

for (int k = 0; k < arr[0].length; k++){ if (arr[j][k] > j + k){

System.out.println("!");

}

}

}

How many times will "!" be printed when the code segment is executed?

• 5 times

• 6 times

• 2 times

• 3 times

• 8 times