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);
    }
}