JAVA 蓝桥杯基础练习 字符串对比

import java.util.Scanner;

public class Main{

public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner in = new Scanner(System.in);
String st1, st2;
st1 = in.nextLine();
st2 = in.nextLine();
if (st1.length() != st2.length()) {
System.out.println(1);
} else if (st1.equals(st2)) {
System.out.println(2);
} else if (st1.toLowerCase().equals(st2.toLowerCase())&&!st1.equals(st2)) {
System.out.println(3);
} else {
System.out.println(4);
}

}

}