按位操作符只可用於int型別,其它型別都會轉化位int型別在操作,並且只有數值右端的低5位才右用(因為2^5=32)

<<  左移位操作符,低位補零

>>  右移位操作符,有符號數高位補1,無符號數高位補0

>>  java專用右移位操作符;無任正負,都在高位插入0

//: object/Shifting.java

package object;
import java.util.*;
import static net.util.Print.*;


public class Shifting{
    public static
 
 void main(String[] args){
        int n1 =-4;
        print("n1<<2 = "+Integer.toBinaryString(n1<<2));
        print("n1<<2 = "+Integer.toBinaryString(n1>>2));
        print("n1<<2 = "+Integer.toBinaryString(n1>>>2));
        print("n1<<2 = "+(n1>>>2));
    }
}
 
/* output:
n1<<2 = 11111111111111111111111111110000
n1<<2 = 11111111111111111111111111111111
n1<<2 = 111111111111111111111111111111
n1<<2 = 1073741823
*///~