32用Enumset代替位域

当Enum多用于集合判断的时候，可以使用这种方式

位域 不利于 判别。 也不利于理解。

Enum却利于判断

enumSet源代码学习

package com.canal.demo;

import java.util.EnumSet;
import java.util.Set;

public class ZookeeperHello {

	private static final int ADD =1<<1; //2
	private static final int DIVIDE =1<<2; //4
	private static final int MULTIPLY =1<<3; //8
	private static final int SUB =1<<4; //16


	private static boolean apply(int code){
		//TODO do logic here
		return false;
	}

	private static boolean apply(Set<Operation> operations){
		return operations.contains(Operation.ADD)||operations.contains(Operation.SUB);
	}


	private static enum Operation{
		ADD(2),
		DIVIDE(4),
		MULTIPLY(8),
		SUB(16);

		private int code;

		Operation(int code) {
			this.code = code;
		}

		public int getCode() {
			return code;
		}

	}


	public static void main(String[] args) {

		System.out.println(apply(ADD|SUB));
		System.out.println(apply(EnumSet.of(Operation.ADD,Operation.DIVIDE)));

	}
}