手写个冒泡排序吧！

public class asd {
public static void main(String[] args) {
int[] arr = new int[]{2, 34, 56, 766, 23, 123, 123, 34};
for (int i = 0; i < arr.length - 1; i++) {
for (int j = 0; j < arr.length - 1 - i; j++) {
if (arr[j] > arr[j + 1]) {
int temp = arr[j];
arr[j] = arr[j + 1];
arr[j + 1] = temp;
}
}
}
for (int i = 0; i <arr.length ; i++) {
System.out.println(arr[i]);
}
}
}