1.定義常量：

public enum Color {RED,ORANGE,YELLOW,GREEN,INDIGO,BLUE,PURPLE }

2.用于switch：?

enum Color {RED,ORANGE,YELLOW,GREEN,INDIGO,BLUE,PURPLE } public class Draw{Color c = Color.BLUE;public void draw(){switch(c){case RED:c = Color.RED;break;case ORANGE:c = Color.ORANGE;break;case YELLOW:c = Color.YELLOW;break;case GREEN:c = Color.GREEN;break;case INDIGO:c = Color.INDIGO;break;case BLUE:c = Color.BLUE;break;case PURPLE:c = Color.PURPLE;break;}} }?

3.在枚舉中添加新方法：

public enum Color {RED(1,"紅"),ORANGE(2,"橙"),YELLOW(3,"黃"),GREEN(4,"綠"),INDIGO(5,"靛"),BLUE(6,"藍"),PURPLE(7,"紫");//成員變量private int sequence;private String name;//構造方法private Color(int sequence, String name) {this.sequence = sequence;this.name = name;}//自定義方法public static String getColorName(int sequence){for (Color c : Color.values()) {if(c.getSequence() == sequence)return c.name;}return null;}//getter&setterpublic int getSequence() {return sequence;}public void setSequence(int sequence) {this.sequence = sequence;}public String getName() {return name;}public void setName(String name) {this.name = name;} }

4.覆蓋（重寫）枚舉的方法：

public enum Color {RED(1,"紅"),ORANGE(2,"橙"),YELLOW(3,"黃"),GREEN(4,"綠"),INDIGO(5,"靛"),BLUE(6,"藍"),PURPLE(7,"紫");//成員變量private int sequence;private String name;//構造方法private Color(int sequence, String name) {this.sequence = sequence;this.name = name;}//覆蓋方法 @Overridepublic String toString() {return "順序："+this.sequence+"_顏色名："+this.name;} }

5.實現接口：

interface Action{void getDetail(); } public enum Color implements Action{RED(1,"紅"),ORANGE(2,"橙"),YELLOW(3,"黃"),GREEN(4,"綠"),INDIGO(5,"靛"),BLUE(6,"藍"),PURPLE(7,"紫");//成員變量private int sequence;private String name;//構造方法private Color(int sequence, String name) {this.sequence = sequence;this.name = name;}@Overridepublic void getDetail() {System.out.println("順序："+this.sequence+"_顏色名："+this.name);} }

6.使用接口組織枚舉：

public interface Food { enum Coffee implements Food{ BLACK_COFFEE,DECAF_COFFEE,LATTE,CAPPUCCINO } enum Dessert implements Food{ FRUIT, CAKE, GELATO } }

7.枚舉集合：

java.util.EnumSet和java.util.EnumMap是兩個枚舉集合。EnumSet保證集合中的元素不重復；EnumMap中的key是enum類型，而value則可以是任意類型。

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轉載于:https://www.cnblogs.com/lxcmyf/p/6558514.html

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