移位运算

1，<< ：左移运算符，

System.out.println(1<<1);//2

System.out.println(1<<2);//2*2

System.out.println(1<<3);//2*2*2

2，>>： 右移运算符

System.out.println(16>>1);//16/2

System.out.println(16>>2);// 16/2/2

System.out.println(16>>3);// 16/2/2/2

3，>>>： 无符号右移运算符

System.out.println(0x7ffffff); //134217727

System.out.println(0x7ffffff>>>24); //右移24位获取高8位 ----7

System.out.println(0x7ffffff>>>16);//134217727 / 2^16

System.out.println(0x7ffffff>>>8);//  134217727/ 2^8

System.out.println(0x7ffffff>>>0);//  34217727/ 2^0

4，<<<：无符号左移运算符

System.out.println(1<<<1);//2

System.out.println(1<<<2);//2*2

System.out.println(1<<<3);//2*2*2