字符串对比

import java.util.Scanner;import java.util.prefs.BackingStoreException;public class Main {public static void main(String[] args) {Scanner sc = new Scanner(System.in);String s1 = sc.nextLine();String s2 = sc.nextLine();int len1 = s1.length();int len2 = s2.length();if(len1 == len2 ){if(s1.equals(s2)){System.out.println("2");}else if(s1.equalsIgnoreCase(s2)){System.out.println("3");}else{System.out.println("4");}}else{System.out.println("1");}}}