Java 字节数组与字符串的相互转换

字节数组与字符串的相互转换

• 字节数组转字符串
• 字符串转字节数组

字节数组转字符串

//字节数组转字符串
        byte[] data = {104, 101, 108, 108, 111};
        //1.整体转换
        //传递一个参数，即字节数组名
        String str1 = new String(data);
        System.out.println(str1);
        //2.指定区间转换
        //传递三个参数，即字节数组名，开始下标，转换长度
        String str2 = new String(data, 1, 3);
        System.out.println(str2);
           

hello
ell
           

字符串转字节数组

//字符串转字节数组
        String str = "hello";
        //1.调用API
        byte[] data1 = str.getBytes();
        System.out.println(Arrays.toString(data1));
        //2.遍历
        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]