我怎麼能從我的枚舉在Java中設置整數，字符串值？

Question

如何預先定義Enum中的任何類型的值？

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

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 2

您可以在enums中定義members。然後覆蓋toString()

您可以定義一個getDesc()方法，該方法更好地覆蓋IMO，覆蓋toString()。

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; 
    } 
} 

只要注意這是解決方案可開始Java版本1.5

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; 
    } 
}