选择排序

public static void main(String[] args) {
    int[] aa = {5, 86, 21, 231, 4, 3, 1, 74};
    paixu(aa);
    printaaaa(aa);
}

public static void paixu(int[] aa) {
    for (int i = 0; i < aa.length - 1; i++) {
        for (int o = i + 1; o < aa.length; o++) {
            if (aa[i] > aa[o]) {
                int p = aa[i];
                aa[i] = aa[o];
                aa[o] = p;
            }
        }
    }
}

public static void printaaaa(int[] arry) {
    for (int i = 0; i < arry.length; i++) {
        System.out.println(arry[i]);
    }
}