二进制存储判断功能-优快云博客

本文探讨了Java中使用位操作实现功能值的组合与解析。通过对特定位进行设置和检查，展示了如何根据不同的功能需求生成对应的整数值，并从中解析出已启用的功能。

package happy;

public class ChannelFunctionTest {
public static void main(String[] args) {
System.out.println(0|(1<<1));
System.out.println("+++++++++++++++++++");
System.out.println((0|(1<<1))&(1<<1));
System.out.println((0|(1<<1))&(1<<2));
System.out.println((0|(1<<1))&(1<<3));
System.out.println((0|(1<<1))&(1<<4));
System.out.println((0|(1<<1))&(1<<5));
System.out.println("----------------------------------");
System.out.println((0|(1<<1))|(1<<2));
System.out.println("+++++++++++++++++++");
System.out.println(((0|(1<<1))|(1<<2))&(1<<1));
System.out.println(((0|(1<<1))|(1<<2))&(1<<2));
System.out.println(((0|(1<<1))|(1<<2))&(1<<3));
System.out.println(((0|(1<<1))|(1<<2))&(1<<4));
System.out.println(((0|(1<<1))|(1<<2))&(1<<5));
System.out.println("----------------------------------");
System.out.println(((0|(1<<1))|(1<<2))|(1<<3));
System.out.println("+++++++++++++++++++");
System.out.println((((0|(1<<1))|(1<<2))|(1<<3))&(1<<1));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3))&(1<<2));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3))&(1<<3));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3))&(1<<4));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3))&(1<<5));
System.out.println("----------------------------------");
System.out.println(((0|(1<<1))|(1<<2))|(1<<3)|(1<<4)|(1<<5));
System.out.println("+++++++++++++++++++");
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4))&(1<<1));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4))&(1<<2));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4))&(1<<3));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4))&(1<<4));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4))&(1<<5));
System.out.println("----------------------------------");
System.out.println(((0|(1<<1))|(1<<2))|(1<<3)|(1<<4)|(1<<5));
System.out.println("+++++++++++++++++++");
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4)|(1<<5))&(1<<1));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4)|(1<<5))&(1<<2));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4)|(1<<5))&(1<<3));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4)|(1<<5))&(1<<4));
System.out.println((((0|(1<<1))|(1<<2))|(1<<3)|(1<<4)|(1<<5))&(1<<5));
}
}

package com.cainiao.aeye.hsf.util;

import java.util.ArrayList;
import java.util.List;

/**
 * @author wb-fem407232
 * @date 2018/08/02
 */
public class SundaryUtil {

    /**
     * 通过传入功能枚举bitPos
     * 得到functionValue(即数据库存储的value)
     * @param bitPosList
     * @return
     */
    public static Integer getFunctionValue(List<Integer> bitPosList){
        if(bitPosList==null || bitPosList.size()>0){
            return null;
        }
        Integer functionValue=0;
        for (Integer bitPos: bitPosList) {
            functionValue=functionValue|(1<<bitPos);
        }
        return functionValue;
    }

    /**
     * 通过传入功能枚举bitPos
     * 得到拥有的功能bitPos
     * @param bitPosList
     * @return
     */
    public static List<Integer> getHasFunctions(Integer functionValue,List<Integer> bitPosList){
        if(functionValue==null ||bitPosList==null ||bitPosList.isEmpty()){
            return null;
        }
        List<Integer> hasFunctionBitPos = new ArrayList<>();
        for (Integer bitPos:bitPosList) {
            if((functionValue&(1<<bitPos))!=0){
                hasFunctionBitPos.add(bitPos);
            }
        }
        return hasFunctionBitPos;
    }
}