Enum的使用

在项目开发中经常会使用到枚举，下面将举个例子，展示枚举的使用，不说废话，直接上代码。

package com.tom.enumTest;

public enum StatusType {
   A("FOOD","1"), B("CAR","2"), C("HOME","3");
   private String label;
   private String value;
/**
 * @return the label
 */
public String getLabel() {
    return label;
}
/**
 * @param label the label to set
 */
public void setLabel(String label) {
    this.label = label;
}
/**
 * @return the value
 */
public String getValue() {
    return value;
}
/**
 * @param value the value to set
 */
public void setValue(String value) {
    this.value = value;
}
private StatusType(String label, String value) {
    this.label = label;
    this.value = value;
}
  public StatusType getStatusTypeByValue(String val) {
        for (StatusType statusType : StatusType.values()) {
            if (statusType.getValue().equals(val)) {
                return statusType;
            }
        }
      return null;
  }
  
}

package com.tom.enumTest;

import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

public class TestForEnum {
    private static final String GET_LABEL_METHOD = "getLabel";
    public static <T extends Enum<T>> T translateByCode(final Class<T> clazz, final String code) {
        if(code != null){
            try {
                final Method m = clazz.getDeclaredMethod(GET_LABEL_METHOD);
                for (T t : inspectConstants(clazz)) {
                    if (code.equals(m.invoke(t))) {
                        return t;
                    }
                }
            } catch (Exception e) {            
                throw new RuntimeException(e);
            }
        }
        return null;
    }
    public static <T extends Enum<T>> List<T> inspectConstants(final Class<T> clazz) {
        return new ArrayList<T>(Arrays.asList(clazz.getEnumConstants()));
    }
    public static void main(String[] args) {
        StatusType statusType = translateByCode(StatusType.class, "FOOD");
        System.out.println(statusType.getLabel()+","+statusType.getValue());
    }
}

public enum NumberEnum {
    ONE("1","哈哈"),
    TWO("2","嘿嘿"),
    THREE("3","呵呵");
    private String key;
    private String value;
    NumberEnum(String key,String value) {
        this.key = key;
        this.value = value;
    }

    public String getKey() {
        return key;
    }

    public String getValue() {
        return value;
    }
    public static NumberEnum getByKey(String key){
        NumberEnum[] numEnum = NumberEnum.values();
        for(NumberEnum dEnum : numEnum){
            if(redEnum.getValue() == key){
                return dEnum;
            }
        }
        return null;
    }

@Test
public void getIt4() {
   Map<String,Object> map = new HashMap<String, Object>();
   NumberEnum[] numEnum = NumberEnum.values();
   if ( null != numEnum && numEnum.length >=0) {
      for (NumberEnum nEnum : numEnum) {
         map.put(nEnum.getKey(),nEnum.getValue());

      }
   }
   System.out.println(map.size());
}