System.out.println(0X1<<2); //2^a-->2^(a+b)
创建时间：
2015/8/1 10:55
System.
out
.println(0X1<<2);
//2^a-->2^(a+b)
System.
out
.println(-8>>1);
//2^a-->2^(a-b) -2^-a-->-z^(-a=b)
System.
out
.println(-1>>>1);
//-2^32-->2^(32-1)