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Javaで整数 ⇄ バイト配列の相互変換

Last updated at Posted at 2015-09-17

必要なインポート

import java.nio.ByteBuffer;

整数 → 4バイトの配列

byte[] bytes = ByteBuffer.allocate(4).putInt(整数).array();

バイト配列 → 整数

int num = ByteBuffer.wrap(バイト配列).getInt();

サンプルコード

整数1695609641を4のバイトの配列に変換して、元の整数に戻す例です

import java.nio.ByteBuffer;

public class Main {

    public static void main(String[] args) {
        // int -> bytes
        byte[] bytes = ByteBuffer.allocate(4).putInt(1695609641).array();
        // bytes -> int
        int num = ByteBuffer.wrap(bytes).getInt();

        System.out.print("bytes: ");
        for(byte b: bytes){
            System.out.printf("%x ", b);
        }
        System.out.println();

        System.out.print("int: ");
        System.out.println(num);
    }

}

出力結果

bytes: 65 10 f3 29 
int: 1695609641

参考

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