Java Data Type - 如何获取字符串的大小w /编码，以字节为单位

import java.nio.charset.Charset;
import java.nio.charset.StandardCharsets;

public class Main {
  public static long bytesRequiredToEncode(final String s,
      final Charset encoding) {
    int ENCODE_CHUNK = 100;
    long count = 0;
    for (int i = 0; i < s.length();) {
      int end = i + ENCODE_CHUNK;
      if (end >= s.length()) {
        end = s.length();
      } else if (Character.isHighSurrogate(s.charAt(end))) {
        end++;
      }
      count += encoding.encode(s.substring(i, end)).remaining() + 1;
      i = end;
    }
    return count;
  }

  public static void main(String[] args) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < 100; i++) {
      sb.appendCodePoint(1064124);
    }
    Charset cs = StandardCharsets.UTF_8;

    System.out.println(bytesRequiredToEncode(new String(sb), cs));
    System.out.println(new String(sb).getBytes(cs).length);
  }
}