Exam 4 (Chapters 5 & 6, mainly 8)

What is the value of names[4] in the following array? String[] names = {"Jeff", "Dan", "Sally", "Jill", "Allie"};

Allie (Jeff = 0, Dan = 1, Sally = 2, Jill = 3, Allie =4)

What will be the output of the following code? int[] arr = new int[9]; System.out.println(arr[0]);

0

4. public class Main { public static void main(String args[]) { int arr[][] = new int[4][]; arr[0] = new int[1]; arr[1] = new int[2]; arr[2] = new int[3]; arr[3] = new int[4]; int i, j, k = 0;

0 1 2 3 4 5 6 7 8 9 ?

What numbers does the code that follows print to the console? int[] numbers = {1, 2, 3, 4, 5, 6, 7, 8, 9}; for (int i = 0; i < 8; i++) { System.out.println(numbers[i]); }

1-8

2. Predict the output // file name: Main.java public class Main {public static void main(String args[]) {int arr[] = {10, 20, 30, 40, 50}; for(int i=0; i < arr.length; i++) { System.out.print(" " + arr[i]);

10, 20, 30, 40, 50

The length of the following array is int[] grades = new int[4];

4

3. class Test { public static void main(String args[]) { int arr[2]; System.out.println(arr[0]); System.out.println(arr[1]); } }

compiler error

1. Which of the following is FALSE about arrays on Java

Length of array can be changed after creation of array

Output of following Java program? class Test { public static void main (String[] args) { int arr1[] = {1, 2, 3}; int arr2[] = {1, 2, 3}; if (arr1 == arr2) System.out.println("Same"); else; System.out.println("Not Same");

Not Same

class Test { public static void main (String[] args) { int arr1[] = {1, 2, 3}; int arr2[] = {1, 2, 3}; if (arr1.equals(arr2)) System.out.println("Same"); else System.out.println("Not Same");

Not Same

Output of following Java program? import java.util.Arrays; class Test { public static void main (String[] args) { int arr1[] = {1, 2, 3}; int arr2[] = {1, 2, 3}; if (Arrays.equals(arr1, arr2)) System.out.println("Same");

Same

Which of the following, if any, is an invalid array declaration?

String[] names = new String[5]; String names[] = new String[5]; String[] names = new String[0]; all are valid

What will be the output of the following code? int[] arr = new int[9]; System.out.println(arr[9]);

error because index must be less than the higher number of the array size

Which of the following statements gets the number of integers in the array that follows? int[] customers = new int[55];

int size = customers.length;

local variable

located on the stack

new variables

stored on the heap

What is the highest index value associated with the array that follows? byte[] values = new byte[x];

x - 1 (the highest value index you can create is one less than the value you created...?)