可以在java中设置枚举起始值 [英] can set enum start value in java

问题描述

我使用枚举做一些常量：

 枚举ids {OPEN，CLOSE}; 
  

OPEN值为零，但我希望它为100.是可能吗？

解决方案

Java枚举不像C或C ++枚举，它们只是整数的标签。

pre pre pre pre pre code $ b OPEN（100），CLOSE（200）;

private final int id;
Ids（int id）{this.id = id; }
public int getValue（）{return id; }
}

最大的区别在于它们是类型安全这意味着你不必担心将COLOR枚举分配给SIZE变量。

请参阅 http://docs.oracle.com/javase/tutorial/java/javaOO/enum.html 了解更多信息。 p>

I use the enum make a few constants:

enum ids {OPEN, CLOSE};

the OPEN value is zero, but I want it as 100. Is it possible?

解决方案

Java enums are not like C or C++ enums, which are really just labels for integers.

Java enums are implemented more like classes - and they can even have multiple attributes.

public enum Ids {
    OPEN(100), CLOSE(200);

    private final int id;
    Ids(int id) { this.id = id; }
    public int getValue() { return id; }
}

The big difference is that they are type-safe which means you don't have to worry about assigning a COLOR enum to a SIZE variable.

See http://docs.oracle.com/javase/tutorial/java/javaOO/enum.html for more.

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