如何在字符串中打印第一个字符的二进制表示 [英] How do I print the binary representation of the first character in a string

问题描述

我想检索文件中数据的二进制值。所以我写了以下代码：

i want to retrieve the binary values of the data in the file. so i have written the following the code:

while ((fileData = br.readLine()) != null) {
  byte b[] = fileData.getBytes("UTF-8");
  BigInteger bi = new BigInteger(b);
  String s = bi.toString(2);
  System.out.println("Original message in binary: " + s);
  System.out.println("Original message length: " + s.length());
}

输出：

abca (this is the data in a text file)
Original message in binary: <here>1100001011000100110001101100001
Original message length: 31

一切都很好，但是当我打印二进制格式的数据时，我无法打印第一位（< here> ）任何人都可以帮助我吗？

Everything is fine but while i am printing the data in binary format i am not able to print the first bit (<here>) can anyone help me?

推荐答案

对于第一个角色：

s.charAt(0);

---

编辑：
如果你想打印第一个字节的二进制表示，那么试试这个：

---

If you want to print the binary representation of first byte then try this:

    String str = Integer.toBinaryString("abca".getBytes("UTF-8")[0]);
    System.out.println(str);

编辑2：
尝试使用前导零。

EDIT 2: Try this for leading zeroes.

static String addLeadingZeroes(String s) {
    int zeroes = s.length() % 8;
    byte[] bzero = new byte[8 - zeroes];
    Arrays.fill(bzero, (byte)0x30);
    return new StringBuilder(new String(bzero)).append(s).toString();
}

并致电

System.out.println("Original message in binary: "+ addLeadingZeroes(s));

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