补码：

补码的规律

* 1. int最大值: 一个0, 31个1

* 16进制: 0x7fffffff

* 2. int最小值:

* 16进制: 0x80000000

* 3. -1 : 在内存中是32个1

* 16进制: 0xffffffff

int max = Integer.MAX_VALUE;

System.out.println(max);

System.out.println(

Integer.toBinaryString(max));

补码的互补对称现象：

int n = 8;

int m = ~n+1;

System.out.println(m);

System.out.println(Integer.toBinaryString(n));

System.out.println(Integer.toBinaryString(~n));

System.out.println(Integer.toBinaryString(~n+1));

//经典面试题目:

System.out.println(~100+1);

//如上代码输出结果:

//A.99 B.-99 C.100 D.-100 E.101

//答案: D

//经典面试题目:

System.out.println(~100);

//如上代码输出结果:

//A.99 B.-99 C.100 D.-100 E.-101

//答案: E

//经典面试题目:

System.out.println(~-100);

//如上代码输出结果:

//A.99 B.-99 C.100 D.-100 E.-101

//答案: A