Question

我正在编写此代码，您可以为程序命名。

Java告诉我，如果变量“isACoolGuy”为false，则应该使用语句中的else。

if (isACoolGuy = true){
        System.out.println("Thank you for this name... "+ name);
    }else if(isACoolGuy = false){    
        System.out.println("Okay im changing my name since you are an idiot");
        name = name = "jack";
        System.out.println("My name is "+ name + " now");

之前有一个switch语句应该将“isACoolGuy”布尔值更改为false。

case "name":
            System.out.println("You are an a******");
            isACoolGuy = false;
            break;

Answer 1

你的错误

if (isACoolGuy == true){
        System.out.println("Thank you for this name... "+ name);
    }else if(isACoolGuy == false){
        System.out.println("Okay im changing my name since you are an idiot");
        name = "jack";
        System.out.println("My name is "+ name + " now");

或更好

if (isACoolGuy){
        System.out.println("Thank you for this name... "+ name);
    }else if(!isACoolGuy){
        System.out.println("Okay im changing my name since you are an idiot");
        name =  "jack";
        System.out.println("My name is "+ name + " now");

并且在你的情况下最正确的方法是跳过else if并将其替换为像这样的其他

if (isACoolGuy){
        System.out.println("Thank you for this name... "+ name);
    }else {
        System.out.println("Okay im changing my name since you are an idiot");
        name =  "jack";
        System.out.println("My name is "+ name + " now");

和一些理论

isACoolGuy = true表示为isACoolGuy变量赋值true。在if中使用它总是返回true isACoolGuy == true检查变量isACoolGuy是否具有true值。这是比较

在if中你可以跳过比较布尔值，因为if具有以下格式

if(true)
{

}

所以如果（isACoolGuy）类似于if（isACoolGuy == true）

Answer 2

不是检查它是否为真，而是将isACoolGuy指定为true，因此它总是计算为true。

 if (isACoolGuy = true){

改为使用

 if (isACoolGuy == true){

更好用： -

if (isACoolGuy)

Answer 3

要检查条件，请使用==而非=进行分配，例如此if(isACoolGuy == true)。
尝试删除第二个条件if(isACoolGuy == false)没有必要，这就足以让关键字else像这样：

  isACoolGuy = true;  
  ...
  if (isACoolGuy){ // the positive control
    System.out.println("Thank you for this name... "+ name);
 }else{    // otherwise negative
    ...
  }

if else语句中的死分支

3 个答案: