java语言中的switch case语法注意事项

每个case最好都写上break；因为匹配到一个case的时候如果没有break，会继续执行下面没有被匹配的case，直到遇到break或者代码执行结束

public class LockCondtionDemo1 {
    static enum Color{
        Red,Green,Yellow,Pink
    }
    private static void printColor(Color color){
        switch (color){
            case Red:
                System.out.println("red");
            case Green:
                System.out.println("green");
            case Yellow:
                System.out.println("yello");
            case Pink:
                System.out.println("pink");
                default:
                    System.out.println("default");
        }
    }
    public static void main(String[] args) {
        printColor(Color.Green);
    }
}

执行结果

green
yello
pink
default

如果加上break

public class LockCondtionDemo1 {
    static enum Color{
        Red,Green,Yellow,Pink,Other
    }
    private static void printColor(Color color){
        switch (color){
            case Red:
                System.out.println("red");break;
            case Green:
                System.out.println("green");break;
            case Yellow:
                System.out.println("yello");break;
            case Pink:
                System.out.println("pink");break;
                default:
                    System.out.println("default");break;
        }
    }
    public static void main(String[] args) {
        printColor(Color.Green);
    }
}

输出结果：
····
green
····