排序法

public class Test {
    public static void main(String[] args) {
        int[] arr = { 9, 5, 6, 3, 8, 2, 1, 4, 7 };
        int temp;
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr.length - 1 - i; j++) {
                if (arr[j] > arr[j + 1]) {
                    temp = arr[j];
                    arr[j] = arr[j + 1];
                    arr[j + 1] = temp;
                }
            }
        }
        for (int i = 0; i < arr.length; i++) {
            System.out.print(arr[i] + "\t");
        }
    }
}

import java.util.Arrays;
public class Test {
    public static void main(String[] args) {
        int[] arr = { 9, 5, 6, 3, 8, 2, 1, 4, 7 };
        for (int i = 0; i < arr.length; i++) {
            for (int j = 0; j < arr.length - 1 - i; j++) {
                if (arr[j] > arr[j + 1]) {
                    arr[j] = arr[j] ^ arr[j + 1];
                    arr[j + 1] = arr[j] ^ arr[j + 1];
                    arr[j] = arr[j] ^ arr[j + 1];
                }
            }
        }
        System.err.println(Arrays.toString(arr));
    }
}