布尔值，if-else语句和扫描器？

Question

I am trying to make the "yes" (or "y" in this case) response to a question a true statement. Any other response to the question below is known to be a false statement.

System.out.print("Do you smoke?(y/n): ");
        boolean smoker = console.nextBoolean();
        if (smoker.equalsIgnoreCase("y")) {
            smoker = true;
        } else {
            smoker = false;
        }

I get the error

HealthPlan.java:32: error: boolean cannot be dereferenced
        if (smoker.equalsIgnoreCase("y")) {
              ^

Does anyone know how I can fix this? I have searched this online and I am not so sure.

Answer 1

Can't cast a String to a boolean , catch the console.next line as a String . Check if it's y and then place the the value in a boolean

String smoker = console.nextLine();
boolean isSmoker = false;
if (smoker.equalsIgnoreCase("y")) {
    isSmoker = true;
}

Answer 2

You have two problems here.

First your variable smoker is of type boolean . Which is a primitive type. A primitive type is not an object, you can't call a method or an attribute on it. So you can't write smoker.someAttribute or smoking.someMethod() . This is why you get this Exception.

Second, your variable is of type boolean so you can only affect boolean to it. But you are trying to affect a String to it, it will obviously fail. This error is hidden cause of the first one.

---

The solution is the same for both problem. Either check directly the console input, or pass it to a String variable then check this variable value. Then after the check, affect the correct boolean value to smoker .

With the direct check :

boolean smoker = false;
if(console.nextLine().equalsIgnoreCase("y")){
    smoker = true;
}

With a String variable

boolean smoker = false;
String consoleInput = console.nextLine();
if(consoleInput.equalsIgnoreCase("y")){
    smoker = true;
}