Making a array and while loop

Question

Hello friends,
I have a homework but I don’t know from where should I start
I have to write a program In java that must have the following concept
First I have to make an array that has 4 int index
And after that I have to make a while loop
When I run the program the index must change their place with each other
I hope that I explain it well
Thanks in advance 🤗🤗🤗

Answer 1

Plz elabrate your qustion
I think you want to shuffel your int indexs.

Answer 2

Sam

I think this you want run that programme

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

Random r = new Random();

int random;

for(int i=0;i<arr.length;i++)
{
random = r.nextInt(i+1);

int temp = arr[i];
arr[i] = arr[random];
arr[random]=temp;
}

for(int i:arr)
{
System.out.print(i+", ");
}

Answer 3

Sam
// first line of you programme
import java.util.*;

And inside the class paste it that code that i wrote.

Than your programme work properly.

Answer 4

create an array:

int[] arr = new int[4];
arr is an empty array (all 4 elemnts are 0).
index from 0 to 3 (in java an index starts always at 0).
how to fill:
e.g. arr[0] = 4; //the first element is 4
arr[2] = 1; //third element is 2

Or:
int[] arr = {1,2,3,4};
This would be a filled array.

int i = 0;
while(i < arr.length){
System.out.println(arr[i]);
i++; //increment i
}

Answer 5

Sam Sorry I didn't see that you want to shuffle the array.

In a special order or randomly?

Answer 6

If you are not familiar with Random() you can do this:

int[] arr = {1,2,3,4};
int i = 0;

while(i < arr.length / 2){

int temp = arr[i];
arr[i] = arr[arr.length - 1 - i];
arr[arr.length - 1 - i] = temp;
i++;

}

This code will reverse the array. You can play around with the index to see what happens.

Answer 7

Sam
Add another for loop to print the values.

Answer 8

thank u Sumit Programmer😎😎 now it works

Answer 9

Sumit Programmer😎😎 dear the program which you have wrote it has error can you check it once 🙏🏿🙏🏿🙏🏿🙏🏿

Answer 10

Denise Roßberg when i run your program
the result is
no output

Answer 11

Sumit Programmer😎😎 yes exactly

Answer 12

Denise Roßberg sorry but it’s not changing their place with each other