Question

下面的代码只是一直给出其他错误消息我不知道出了什么问题..

Boolean loop2 = true;
userInput = scan.next();

while (loop2) {
    userInput = scan.next();
    if(userInput.toLowerCase() == "") {
        out.println(
            "Please pick a option! it's in the 'Commands' <= type this in!"
        );
        loop2 = true;
    } else if(userInput.toLowerCase() == "fight") { 
        Fights(); loop2 =   false;
    } else if(userInput.toLowerCase() == "train") { 
        Training(); loop2 = false; 
    } else if(userInput.toLowerCase() == "bosses") { 
        Bossing(); loop2 =  false; 
    } else if(userInput.toLowerCase() == "shops") { 
        ShopsAll(); loop2 = false; 
    } else if(userInput.toLowerCase() == "commands") { 
        Menu(); loop2 = false; 
    } else {
        out.println("ERROR MESSAGE!!.");
    }
}

Answer 1

使用：

"fight".equals(userInput.toLowerCase());

==比较内存引用

Answer 2

在java中，您必须将字符串与.equals()或.equalsIgnoreCase()方法进行比较。切勿使用==运算符来比较字符串！

继续给我错误信息

2 个答案: