Shift operators in java: <<,>>,>>> summary

There are three shift operators in java

<< : : Left shift operator, num << 1, which is equivalent to multiplying num by 2

>> : : Right shift operator, num >> ; 1, which is equivalent to dividing num by 2

>>> : Unsigned right shift, ignore the sign bit, and fill the gaps with 0

Let’s take a look at how these shift operations are used

/**
 * 
 */
package com.b510.test;

/**
 * @author Jone Hongten
 * @create date：2013-11-2
 * @version 1.0
 */
public class Test {

    public static void main(String[] args) {
        int number = 10;
        //原始数二进制
        printInfo(number);
        number = number << 1;
        //左移一位
        printInfo(number);
        number = number >> 1;
        //右移一位
        printInfo(number);
    }
    
    /**
     * 输出一个int的二进制数
     * @param num
     */
    private static void printInfo(int num){
        System.out.println(Integer.toBinaryString(num));
    }
}

The running result is:

1010
10100
1010

Let’s align the above results:

位数
--------
     十进制：10     原始数         number
     十进制：20     左移一位       number = number << 1;
     十进制：10     右移一位       number = number >> 1;

After reading the above demo, do you now know a lot about left shift and right shift?

For: >>>

Unsigned right shift, ignore the sign bit, and fill the gaps with 0

value >>> num -- num specifies the number of digits to shift the value value.

Just remember one thing about the rules of unsigned right shift: ignore the sign bit extension and fill the highest bit with 0. The unsigned right shift operator>>> is only meaningful for 32-bit and 64-bit values ​​

More shift operators in java: <<,>>,>>> To summarize related articles, please pay attention to the PHP Chinese website!