杭电 2000 ( ASCII码排序 ) java

import java.util.Scanner;public class Main {    public static void main(String[] args) {        Scanner sc = new Scanner(System.in);        while (sc.hasNext()) {            String A = sc.next();            char[] a = A.toCharArray();            for (int j = 0; j < a.length; j++) {                for (int i = 0; i < a.length - 1; i++) {                    if (a[i] > a[i + 1]) {                        char t = a[i];                        a[i] = a[i + 1];                        a[i + 1] = t;                    }                }            }            for (int j = 0; j < 3; j++) {                System.out.print(a[j]);                if (j != 2) {                    System.out.print(" ");                }            }            System.out.println();        }    }}