public class Season {
 public static final int SPRING = 1;
 public static final int SUMMER = 2;
 public static final int AUTUMN = 3;
 public static final int WINTER = 4;
}

private String getChineseSeason(int season){
  StringBuffer result = new StringBuffer();
  switch(season){
   case Season.SPRING :
    result.append("春天");
    break;
   case Season.SUMMER :
    result.append("夏天");
    break;
   case Season.AUTUMN :
    result.append("秋天");
    break;
   case Season.WINTER :
    result.append("冬天");
    break;
   default :
    result.append("地球没有的季节");
    break;
  }
  return result.toString();
 }

 public void doSomething(){
  System.out.println(this.getChineseSeason(Season.SPRING));//这是正常的场景

  System.out.println(this.getChineseSeason(5));//这个却是不正常的场景，这就导致了类型不安全问题
 }

public enum Season {
 SPRING, SUMMER, AUTUMN, WINER;
}

public enum Season {
 SPRING(1), SUMMER(2), AUTUMN(3), WINTER(4);

 private int code;
 private Season(int code){
  this.code = code;
 }

 public int getCode(){
  return code;
 }
}
public class UseSeason {
 /**
  * 将英文的季节转换成中文季节
  * @param season
  * @return
  */
 public String getChineseSeason(Season season){
  StringBuffer result = new StringBuffer();
  switch(season){
   case SPRING :
    result.append("[中文：春天，枚举常量:" + season.name() + "，数据:" + season.getCode() + "]");
    break;
   case AUTUMN :
    result.append("[中文：秋天，枚举常量:" + season.name() + "，数据:" + season.getCode() + "]");
    break;
   case SUMMER : 
    result.append("[中文：夏天，枚举常量:" + season.name() + "，数据:" + season.getCode() + "]");
    break;
   case WINTER :
    result.append("[中文：冬天，枚举常量:" + season.name() + "，数据:" + season.getCode() + "]");
    break;
   default :
    result.append("地球没有的季节 " + season.name());
    break;
  }
  return result.toString();
 }

 public void doSomething(){
  for(Season s : Season.values()){
   System.out.println(getChineseSeason(s));//这是正常的场景
  }
  //System.out.println(getChineseSeason(5));
  //此处已经是编译不通过了，这就保证了类型安全
 }

 public static void main(String[] arg){
  UseSeason useSeason = new UseSeason();
  useSeason.doSomething();
 }
}

public enum Color { 
 RED, GREEN, BLANK, YELLOW 
} 

enum Signal { 
 GREEN, YELLOW, RED 
} 
public class TrafficLight { 
 Signal color = Signal.RED; 
 public void change() { 
  switch (color) { 
  case RED: 
   color = Signal.GREEN; 
   break; 
  case YELLOW: 
   color = Signal.RED; 
   break; 
  case GREEN: 
   color = Signal.YELLOW; 
   break; 
  } 
 } 
} 

public enum Color { 
 RED("红色", 1), GREEN("绿色", 2), BLANK("白色", 3), YELLO("黄色", 4); 
 // 成员变量 
 private String name; 
 private int index; 
 // 构造方法 
 private Color(String name, int index) { 
  this.name = name; 
  this.index = index; 
 } 
 // 普通方法 
 public static String getName(int index) { 
  for (Color c : Color.values()) { 
   if (c.getIndex() == index) { 
    return c.name; 
   } 
  } 
  return null; 
 } 
 // get set 方法 
 public String getName() { 
  return name; 
 } 
 public void setName(String name) { 
  this.name = name; 
 } 
 public int getIndex() { 
  return index; 
 } 
 public void setIndex(int index) { 
  this.index = index; 
 } 
} 

public enum Color { 
 RED("红色", 1), GREEN("绿色", 2), BLANK("白色", 3), YELLO("黄色", 4); 
 // 成员变量 
 private String name; 
 private int index; 
 // 构造方法 
 private Color(String name, int index) { 
  this.name = name; 
  this.index = index; 
 } 
 //覆盖方法 
 @Override 
 public String toString() { 
  return this.index+"_"+this.name; 
 } 
} 

public interface Behaviour { 
 void print(); 
 String getInfo(); 
} 
public enum Color implements Behaviour{ 
 RED("红色", 1), GREEN("绿色", 2), BLANK("白色", 3), YELLO("黄色", 4); 
 // 成员变量 
 private String name; 
 private int index; 
 // 构造方法 
 private Color(String name, int index) { 
  this.name = name; 
  this.index = index; 
 } 
//接口方法 
 @Override 
 public String getInfo() { 
  return this.name; 
 } 
 //接口方法 
 @Override 
 public void print() { 
  System.out.println(this.index+":"+this.name); 
 } 
} 

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