Java 位元組數組與字元串的互相轉換

位元組數組與字元串的互相轉換

• 位元組數組轉字元串
• 字元串轉位元組數組

位元組數組轉字元串

//位元組數組轉字元串
        byte[] data = {104, 101, 108, 108, 111};
        //1.整體轉換
        //傳遞一個參數，即位元組數組名
        String str1 = new String(data);
        System.out.println(str1);
        //2.指定區間轉換
        //傳遞三個參數，即位元組數組名，開始下标，轉換長度
        String str2 = new String(data, 1, 3);
        System.out.println(str2);
           

hello
ell
           

字元串轉位元組數組

//字元串轉位元組數組
        String str = "hello";
        //1.調用API
        byte[] data1 = str.getBytes();
        System.out.println(Arrays.toString(data1));
        //2.周遊
        byte[] data2 = new byte[str.length()];
        for (int i = 0; i < str.length(); i++) {
            data2[i] = (byte) str.charAt(i);
        }
        System.out.println(Arrays.toString(data2));
           

[104, 101, 108, 108, 111]
[104, 101, 108, 108, 111]