The Java variable is a little weird

import java.util.Random;

public class Compare {
    public static void main(String[] args) {
        int[] arr = new int[100];
        Random rand = new Random();

        for(int i = 0; i < arr.length; i++) {
            arr[i] = rand.nextInt(100) + 1;
        }

        int[] ascSortedArr = new int[100];
        ascSortedArr = ascBubbleSort(arr);
        int[] decSortedArr = new int[100];
        decSortedArr = decBubbleSort(arr);

        for(int j = 0; j < arr.length; j++) {
            System.out.println(ascSortedArr[j]);
        }
        for(int j = 0; j < arr.length; j++) {
            System.out.println(decSortedArr[j]);
        }
    }

    public static int[] ascBubbleSort(int[] arr) {
        for(int i = 0; i < arr.length; i++) {
            for(int j = 0; j < arr.length -1; j++) {
                int temp;

                if(arr[j] > arr[j + 1]) {
                    temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }

        }

        return arr;
    }

    public static int[] decBubbleSort(int[] arr) {
        for(int i = 0; i < arr.length; i++) {
            for(int j = 0; j < arr.length -1; j++) {
                int temp;

                if(arr[j] < arr[j + 1]) {
                    temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }

        }

        return arr;
    }
}