枚举持续时间问题

发布于 2024-10-20 18:31:32 字数 206 浏览 1 评论 0原文

因此，如果我们有一个像这样的枚举：

  public enum light { red, yellow, green }

持续时间是多少？不是光是某种颜色的时候吗？

比如说

int duration = ligt.red = 1

或者类似的东西？

原文

So if we have an enum like:

  public enum light { red, yellow, green }

What would be the duration? Isn't it the time the light is a certain color?

int duration = ligt.red = 1

or something like that?

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药祭#氼 2024-10-27 18:31:32

像这样声明你的枚举：

public enum Light { 
    RED(1), 
    YELLOW(2), 
    GREEN(3);

    private final int duration;

    Light(int duration) {
        this.duration = duration;
    } 

    public int getDuration() {
        return this.duration;
    }
}

然后你可以像这样使用它：

public class Test {
    public static void main(String... args) {
        Light light = Light.RED;
        System.out.println("Duration of RED is: " + light.getDuration());
    }
}

编辑： 根据 Steve Kuo 的建议，变量 duration 已被确定。

Declare your enum like this:

public enum Light { 
    RED(1), 
    YELLOW(2), 
    GREEN(3);

    private final int duration;

    Light(int duration) {
        this.duration = duration;
    } 

    public int getDuration() {
        return this.duration;
    }
}

Then you can use it like this:

public class Test {
    public static void main(String... args) {
        Light light = Light.RED;
        System.out.println("Duration of RED is: " + light.getDuration());
    }
}

EDIT: Based on Steve Kuo's suggestion, the variable duration has been made final.

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短暂陪伴 2024-10-27 18:31:32

Adarshr 的答案假设持续时间是光颜色的一个属性。如果它是特定信号集的颜色属性，您可以使用 EnumMap。

class Signal {
    private EnumMap<light, Integer> durations = new EnumMap<light, Integer>(light.class);
    Signal() {
        this.durations.put(light.red, 3);
        ....
    }
}

Adarshr's answer presumes that duration is a property of the color of the light. If it is instead a property of the color at a particular set of signals, you might use an EnumMap<light, Integer>.

class Signal {
    private EnumMap<light, Integer> durations = new EnumMap<light, Integer>(light.class);
    Signal() {
        this.durations.put(light.red, 3);
        ....
    }
}

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