Java自定义Enum的实现示例

enum Color { 
    RED, GREEN, BLUE; 
} 

public class Test { 
    // 执行输出结果
    public static void main(String[] args) {
        Color c1 = Color.RED;
        System.out.println(c1);
    }
}



// 运行结果
RED

enum ColorEnum { 
    RED, GREEN, BLUE; 
} 

public class MyClass {

  public static void main(String[] args) {
    ColorEnum color= ColorEnum.BLUE;

    switch(color) {
      case RED:
        System.out.println("红色");
        break;

      case GREEN:
         System.out.println("绿色");
        break;

      case BLUE:
        System.out.println("蓝色");
        break;
    }
  }
}

enum Color 
{ 
    RED, GREEN, BLUE; 
} 
  
public class Test 
{ 
    public static void main(String[] args) 
    { 
        // 调用 values() 
        Color[] colors = Color.values(); 
  
        // 迭代枚举
        for (Color color : colors) 
        { 
            // 查看索引
            System.out.println(color + " at index " + color.ordinal()); 
        } 
  
        // 使用 valueOf() 返回枚举常量，不存在的会报错 IllegalArgumentException 
        System.out.println(Color.valueOf("RED")); 
        // System.out.println(Color.valueOf("WHITE")); 
    } 
}

enum Color 
{ 
    RED, GREEN, BLUE; 
  
    // 构造函数
    private Color() 
    { 
        System.out.println("Constructor called for : " + this.toString()); 
    } 
  
    public void colorInfo() 
    { 
        System.out.println("Universal Color"); 
    } 
} 
  
public class Test 
{     
    // 输出
    public static void main(String[] args) 
    { 
        Color c1 = Color.RED; 
        System.out.println(c1); 
        c1.colorInfo(); 
    } 
}