枚举应用案例

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//应用案例

import java.util.HashMap;

import java.util.Map;

public enum InvoiceStatusEnum {

UNSET(-1, "未知"),
HANDLED(1, "等待处理"),
COMPLETED(2, "处理完成"),
;
private int code;
private String description;
private static Map<Integer, InvoiceStatusEnum> CodeMap;
static {
CodeMap = new HashMap<Integer, InvoiceStatusEnum>();
InvoiceStatusEnum[] values = InvoiceStatusEnum.values();
for (InvoiceStatusEnum value : values) {
CodeMap.put(value.getCode(), value);}
}
public static InvoiceStatusEnum fromCode(int code){
if(CodeMap.containsKey(code)){//如果存在key就返回否则未知
return CodeMap.get(code);
}
return InvoiceStatusEnum.UNSET;
}
private InvoiceStatusEnum(int code,String description){
this.code = code;
this.description = description;
}
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}

}

//相应基础知识

public class TestMain

{

System.out.println("对象块");

}

static

{

System.out.println("静态块");

}

// 构造方法的调用是在new 对象（）时才会调用

// 在声明时是会调用对象｛｝

public TestMain()

{

System.out.println("构造器");

}

public static void main(String[] args)

{

TestMain t = null;

t = new TestMain();

}

执行结果：静态块、对象块、构造器

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