我如何从Java中的枚举中获取设置的整数、字符串值？

Question

如何在枚举中预定义任何类型的值？

public enum Hardware
{
    USB2(0) = "external low speed",
    PCI(1)  = "embedded",
    USB3(2) = "external high speed
}

System.out.println( Hardware.USB2 ) // show me external low speed

Answer 1

您可以在枚举中定义成员。然后覆盖 toString()

您可以定义一个 getDesc() 方法，在我看来，它比覆盖 toString() 更好。

public enum Hardware
{
    USB2(0, "external low speed"),
    PCI(1,"embedded"),
    USB3(2,"external high speed");

    private String desc;
    private int id;

    private Hardware(int id, String desc) {
        this.id = id;
        this.desc = desc;
    }

    @Override
    public String toString() {
        return this.desc;
    }
}

请注意，该解决方案从 Java 版本 1.5 开始可用

Answer 2

enum Hardware
{
    USB2("external low speed"),
    PCI("embedded"),
    USB3("external high speed");

    private String val;

    private Hardware(String val){
        this.val = val;
    }

    public String toString(){
        return val;
    }
}

Answer 3

public enum Hardware {
    USB2(0, "external low speed"),
    PCI(1,"embedded"),
    USB3(2,"external high speed);

    String desc;
    int id;

    public Hardware(int id, String desc) {
        this.id = id;
        this.desc = desc;
    }

    public String toString() {
        return this.desc;
    }
}