package acm;import java.util.Arrays;import java.util.Scanner;/** * Created by ${fk} * on 19:32 2018/3/19 */public class Test {    public static void main(String[] args) {        Scanner scanner = new Scanner(System.in);        String str = scanner.nextLine();        char a = str.charAt(0);        char b = str.charAt(1);        char c = str.charAt(2);        MySort(a, b, c);    }    private static void MySort(char a, char b, char c) {        char a1 = a;        char b1 = b;        char c1 = c;        if (a1 < b1 && b1 < c1) {            System.out.println(a1 + " " + b1 + " " + c1);        }        if (a1 < c1 && c1 < b1) {            System.out.println(a1 + " " + c1 + " " + b1);        }        if (b1 < c1 && c1 < a1) {            System.out.println(b1 + " " + c1 + " " + a1);        }        if (b1 < a1 && a1 < c1) {            System.out.println(b1 + " " + a1 + " " + c1);        }        if (c1 < a1 && a1 < b1) {            System.out.println(c1 + " " + a1 + " " + b1);        }        if (c1 < b1 && b1 < a1) {            System.out.println(c1 + " " + b1 + " " + a1);        }    }}

这个题目关键是要了解Scanner的API里的方法,知道使用哪个方法来把String转化为char.当然也可以调用java给我们封装好的sort()来排序.

String str1 = scanner.next(); String[] str2 = str1.split(" "); Arrays.sort(str2); for (String t : str2) {
      System.out.println(t); }