枚举类型回顾

1、枚举不能继承其他的类，也不能被其他类所继承。
2、枚举类型可以实现多个接口
3、枚举类型只能拥有私有构造器
4、枚举类型里面的对象是public static final的
5、实现了Comparable接口
6、枚举的父类中name属性是私有的，即使之类也定义了name属性，实际上两个name属性是不相干的，相互不影响

java代码：

public class TestEnum2{
	public static void main(String[] args){
		Operator[] op = Operator.values();
		for(int i=0; i<op.length; i++){
			int a = op[i].calculate(5,6);
			System.out.println(op[i]+"--"+op[i].name() + ": " + a);
		} 
	}	
}

//相当于
/*
class Season{
	private String name;
	private Season(String name){this.name = name;}
	public static final Season SPRING = new Season("春");
	public static final Season SUMMER = new Season("夏");
	public static final Season AUTUMN = new Season("秋");
	public static final Season WINTER = new Season("冬");
	public String toString(){return this.name;}
}
*/
enum Operator{
	AA("BBB"){
		public int calculate(int a,int b){
			return a+b;
		}	
	},
	bb(){public int calculate(int a,int b){
		return a+b;
	}	},
	ADD(){
		public int calculate(int a,int b){
			return a+b;
		}	
	},
	MINUS(){
		public int calculate(int a,int b){
			return a-b;
		}	
	},
	MULTIPLY(){
		public int calculate(int a,int b){
			return a*b;
		}	
	},
	DIVIDE(){
		public int calculate(int a,int b){
			return a/b;
		}	
	};	
	private String name;
	private Operator(String name){
		this.name=name;
	}
	public String toString(){
		return name;
	}
	private Operator(){}
	public abstract int calculate(int a, int b);	
}