Java I/O - 如何比较两个CharBuffer的相等

import java.nio.CharBuffer;

public class MainClass {
  public static void main(String[] args) {
    CharBuffer cb1 = CharBuffer.allocate(5), cb2 = CharBuffer.allocate(5);
    cb1.put('B').put('u').put('f').put('f').put('A');
    cb2.put('B').put('u').put('f').put('f').put('B');
    cb1.rewind();
    cb2.rewind();
    System.out.println(cb1.limit(4).equals(cb2.limit(4)));
  }
}