【蓝桥杯】java基础练习--字符串对比，供参考思路

import java.util.Locale;
import java.util.Scanner;
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        String a=scanner.next();
        String b =scanner.next();
        a.toCharArray();
        b.toCharArray();
        if (a.length()==b.length()){
            if (a.equals(b)){
                System.out.println(2);
            }else if(!a.equals(b)&&a.toUpperCase(Locale.ROOT).equals(b.toUpperCase(Locale.ROOT))){
                System.out.println(3);
            }else if (!a.equals(b)&&!a.toUpperCase(Locale.ROOT).equals(b.toUpperCase(Locale.ROOT)))
                System.out.println(4);
        }else System.out.println(1);
    }
}