Question

Create a new Java project/class called ChangeUp. Create an empty int array of size 6. Create a method called populateArray that will pass an array, use random class to choose a random index and prompt the user to enter a value, store the value in the array. Create a method called printArray that prints the contents of the array using the for each enhanced loop.

We are using blueJ for my java class, if you can help me id greatly appreciate it.

Answer 1

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Program

import java.util.Random;
import java.util.Scanner;

class ChangeUp
{
public static void main (String[] args)
{
   // declares an Array of integers.
   int[] arr;
  
   // allocating memory for 5 integers.
   arr = new int[5];
populateArray(arr);
   printArray(arr);
  
}
   public static void populateArray(int[] arr)
   {
       Scanner scan = new Scanner(System.in);
       Random rand = new Random();
       int max=5;
       int min=0;
       int random_index = rand.nextInt((max - min) + 1) + min;
       System.out.print("Enter a value: ");
       int num = scan.nextInt();
       arr[random_index]=num;
   }

   public static void printArray(int[] arr)
   {
       System.out.println("Display array using for each loop");
       for (int a : arr) {
        System.out.print(a+ " ");}
   }
}

Output

Enter a value: 24
Display array using for each loop
0 24 0 0 0

Enter a value: 56
Display array using for each loop
0 0 56 0 0