int与byte之间的相互转化_int转byte-优快云博客

本文详细介绍了如何在Java中将int类型数据转换为byte数组，以及如何反向操作，将byte数组还原为int类型。通过具体的代码示例，讲解了移位操作的重要性，并探讨了源码、反码、补码的概念及其在负数表示中的应用。

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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

https://blog.youkuaiyun.com/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

https://blog.youkuaiyun.com/leonliu06/article/details/78685197
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