如何从数组中打印出唯一的随机数而不重复

Question

I need to simply print numbers with 0-9 from array in order without duplicating the numbers in a random order

Example: 0367458192

So far, I have this but It prints out the numbers with spaces , , and [ which I don't want. I feel like this is really simple but I just cant figure it out. Thanks

    package garbage;

import java.util.Arrays;
import java.util.Collections;
import java.util.Random;


public class ReversalGame {

    public static void main(String[] args) {
        Integer[] arr = new Integer[10];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = i;
        }
        Collections.shuffle(Arrays.asList(arr));
        System.out.println(Arrays.toString(arr));

    }
}

Answer 1

You can use the output of Arrays.toString and then use String::replaceAll to get rid of what you do not want

Integer[] arr = new Integer[10];
for (int i = 0; i < arr.length; i++) {
    arr[i] = i;
}
Collections.shuffle(Arrays.asList(arr));
String res = Arrays.toString(arr).replaceAll("\\[|\\]|,|\\s", "");
System.out.println(res);

output

3752486019