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package com.displacement;

/**

* 移位运算符

*

* Java三种移位运算符:

* <<:左移运算符，num << 1,相当于num乘以2

* >>:右移运算符，num >> 1,相当于num除以2

* >>>:无符号右移，忽略符号位，空位都以0补齐

*

* 按二进制形式把所有的数字向左移动对应的位数，

* 高位(最左点位)移出(舍弃)，低位(最右边位)的空位补零(有符号则正数补零，负数补1)。

*

* @author ken

* 2017-5-31 下午04:23:58

*/

public class Displacement {

public static void main(String[] args) {

int number = 10;

// 原始数二进制

System.out.println("原始数二进制:" + printInfo(number));

// 左移一位

number = number << 1;

System.out.println("左移一位:" + printInfo(number)+"\n");

// 右移2位

number = -10;

number = number >> 2;

System.out.println("右移2位:" + printInfo(number));

//有符号右移二进制转十进制：减一取反

System.out.println(Integer.parseInt(String.valueOf(number))+"\n");

// 无符号右移2位。负二进制(原码取反=反码，反码+1=补码)

number = 5;

System.out.println("原始数二进制:" + printInfo(number));

number = number >>> 1;

System.out.println("无符号右移1位:" + printInfo(number));

System.out.println(Integer.parseInt(String.valueOf(number)));

}

public static String printInfo(int num) {

return Integer.toBinaryString(num);

}

}