字符串answer1 =“是”; if（answer1 ==“yes”）给出错误。为什么？

Question

import java.util.Scanner;

public class NewClass {
    public static void main(String[] args){

        Scanner scanner = new Scanner(System.in);

        System.out.println("Enter your name");
        String name = scanner.nextLine();
        System.out.println("Is "+ name + " really your name?");
        String answer1 = scanner.nextLine();
        if (answer1 == "yes"){
        System.out.println("Alright ");
        }else  {System.out.println("Liar!");
    }
    }
}

即使我输入了Liar!，它也会输出yes，因此answer1等于yes。为什么呢？

Answer 1

因为使用==您正在测试引用相等性，而不是值相等性。 Good reading.

取而代之的是answer1 == "yes" answer1.equals("yes")。