目录

1 主函数2 int转化成byte3 byte转化成int4 测试结果5 过程分析6 知识延伸

1 主函数

public static void main(String[] args) {int number = 10;System.out.println(toInt(toBytes(number)));}

2 int转化成byte

public static byte[] toBytes(int number){byte[] bytes = new byte[4];bytes[0] = (byte)number;bytes[1] = (byte) (number >> 8);bytes[2] = (byte) (number >> 16);bytes[3] = (byte) (number >> 24);return bytes;}

3 byte转化成int

public static int toInt(byte[] bytes){int number = 0;for(int i = 0; i < 4 ; i++){number += bytes[i] << i*8;}return number;}

4 测试结果

5 过程分析

int占4个字节；byte占1个字节。int转化成byte的时候每次取低八位，用四个byte来存储一个int的值。byte转化成int的时候再按原来逆向移动相同的位数并叠加。

6 知识延伸

移位操作

/zhangyong01245/article/details/83715717源码、反码、补码

正数：

反码是源码

补码是源码

负数：

反码是源码除符号位都取反

补码是反码加1计算机为什么要用补码表示数值

/leonliu06/article/details/78685197

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