Java Switch 不兼容类型 Boolean Int

Question

我有以下类(class):

public class NewGameContract {

public boolean HomeNewGame = false;

public boolean AwayNewGame = false;

public boolean GameContract(){

    if (HomeNewGame && AwayNewGame){
        return true;
    } else {
        return false;
    }
}
}

当我尝试像这样使用它时:

            if (networkConnection){

            connect4GameModel.newGameContract.HomeNewGame = true;

            boolean status = connect4GameModel.newGameContract.GameContract();

            switch (status){

                case true:
                    break;

                case false:
                    break;
            }
            return;
        }

我收到错误:

incompatible types found: boolean required: int on the following
`switch (status)` code.

我做错了什么？

Answer 1

您无法打开 boolean 值(无论如何它只有 2 个值):

Java 语言规范明确规定了可以switch-ed 的表达式类型。

JLS 14.11 The switch statement

SwitchStatement:
    switch ( Expression ) SwitchBlock

The type of the Expression must be char, byte, short, int, Character, Byte, Short, Integer, or an enum type, or a compile-time error occurs.

简单地使用 if 语句来区分 boolean 的两种情况会更具可读性和简洁性。