蓝桥网试题 java 基础练习 字符串对比

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java有很多可以拿来用的方法为什么不用呢

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 import java.util.*;
 public class Main {
     public static void main(String[] args) {
         Scanner sc = new Scanner(System.in);
         String a1 = sc.nextLine();
         String a2 = sc.nextLine();
         if(a1.length()==a2.length())
             if(a1.toLowerCase().equals(a2.toLowerCase()))
                 if(a1.equals(a2))
                     System.out.println(2);
                 else
                     System.out.println(3);
             else
                 System.out.println(4);
         else
             System.out.println(1);
     }
 }