[编程入门]三个字符串的排序 （Java代码）

     import java.util.Scanner;
     public class Main {
     public static void main(String[] age){
     Scanner sc=new Scanner(System.in);
     String s1=sc.nextLine();
     String s2=sc.nextLine();
     String s3=sc.nextLine();
     String s4=new String();
     if(s1.compareTo(s2)>0){
    s4=s1;
    s1=s2;
    s2=s4;
     }
     if(s1.compareTo(s3)>0){
    s4=s1;
    s1=s3;
    s3=s4;
     }
     if(s2.compareTo(s3)>0){
    s4=s2;
    s2=s3;
    s3=s4;
     }
     System.out.println(s1+"\n"+s2+"\n"+s3);

}

}