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

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

public class ChangeUp{
    public static void main(String [] args){
        int n = 6;
        int[] arr= new int[n];
        populateArray(arr); //We call populateArray by passing arrayWe.
        printArray(arr); //We call the printArray to output/print the components of array.
    }
    //here we interpret populateArray method
    public static void populateArray(int[] array){
        
        Random myrandom = new Random();
        Scanner s = new Scanner(System.in);
        int i = myrandom.nextInt(5) + 1; //We select random index for user to submit the numbr
        System.out.println("Enter the value in randomly chosen index number " + i + ":"); //asked to submit a value here.
        array[i] = s.nextInt();
   }
   //here we interpret the printArray method
    public static void printArray(int[] array){
        System.out.println("The upgraded array will be ");
        for(int a=0; a < array.length; a++){ //we will be using for loop here in order to print the values.
            System.out.print(array[a]); //System.out.print prints the array value.
            System.out.print("\t");// tab space
        }
    }
}

• As asked, first we create the empty array of size 6
• Further, creating a method named populateArray that passes an array which uses random class to choos a random index and further prompting the user to enter a value and store the value in array
• Finally the printArray method prints the contents of the array for ench enhanced loop

I did not have blueJ compiler software so I used an online compiler to execute the code. Don't worry, it is just the same and make sure to save the program as ChangeUp.
Here is the screenshot to the code with output:

import java.util.Scanner; import java.util. Random; 8 9 4- public class Changeup{ 5 public static void main(String [] args) { 6 int n = 6; 7 int[] arr= new int[n]; populateArray(arr); //We call populateArray by passing arraywe. printArray(arr); //We call the printArray to output/print the components of array. 10 } 11 //here we interpret populateArray method 12 - public static void populateArray(int[] array){ 13 14 Random myrandom = new Random(); 15 Scanner s = new Scanner(System.in); 16 int i = myrandom.nextInt(5) + 1; // We select random index for user to submit the numbr 17 System.out.println("Enter the value in randomly chosen index number " +i+":"); //asked to submit a value here. 18 array[i] = s.nextInt(); 19 20 //here we interpret the printArray method 21 - public static void printArray(int[] array){ 22 System.out.println("The upgraded array will be "); 23 - for(int a=0; a < array.length; a++){ //we will be using for loop here in order to print the values. 24 System.out.print(array[a]); //System.out.print prints the array value. 25 System.out.print("\t");// tab space 26 27 28 } }

✓ Execute Mode, Version, Inputs & Arguments JDK 11.0.4 Interactive Stdin Inputs CommandLine Arguments 3 Execute Result CPU Time: 0.28 sec(s), Memory: 40052 kilobyte(s) Enter the value in randomly chosen index number 2: The upgraded array will be 8 8 3 8 8 8

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