A summary of the shift operators in Java _java

There are three kinds of shift operators in Java

<<: Left-shift operator, NUM << 1, equivalent to num multiplied by 2

>>: Right shift operator, NUM >> 1, equivalent to num divided by 2

>>>: Unsigned right shift, ignoring symbol bit, vacancy is 0

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

Copy Code code as follows:

/**
*
*/
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;
       //RAW number binary
        printinfo ( number);
        number = number << 1;
       //Move left one
        printinfo ( number);
        number = number >> 1;
       //Right-move one
        printinfo ( number);
   }

   /**
     * Output binary number of an int
     * @param num
     */
    private static void printinfo (int num) {
         System.out.println (integer.tobinarystring (num));
   }
}

The results of the operation are:

1010
10100
1010 We align the above results:

43,210 digits--------
10,100 in: 10 original number
101,000 binary: 20 left one number = number << 1;
10,100 in: 10 to the right one number = number >> 1;

Look at the demo above, now is not on the left and right move to understand a lot of it

For:>>>

Unsigned right shift, ignoring sign bit, empty space with 0

Value >>> num--num Specifies the number of digits to shift the value of.

The rule of unsigned right shift only remembers one point: the symbol bit extension is ignored, the 0 complement highest bit unsigned right shift operator >>> is only meaningful for 32-bit and 64-bit values