Java:CharBuffer“忽略”数组偏移量?

请帮助我理解以下内容:

我创建了一个 CharBuffer 使用 CharBuffer.wrapped(new char[12], 2, 10) (数组、偏移、长度)
因此,我希望使用偏移量 2 以及 10 . 但是 arrayOffset() 收益率 0 .

我想了解的是(并且无法从JavaDoc中了解到):

• 什么时候 数组() 不是 零 和

• 有没有可能让 字符缓冲器 使用具有“实际”偏移量的数组(这样就永远不会在该偏移量之前访问该数组)?

下面是一个小测试用例:

import java.nio.*;
import java.util.*;
import org.junit.*;

public class _CharBufferTests {

  public _CharBufferTests() {
  }

  private static void printBufferInfo(CharBuffer b) {
    System.out.println("- - - - - - - - - - - - - - -");
    System.out.println("capacity: " + b.capacity());
    System.out.println("length: " + b.length());
    System.out.println("arrayOffset: " + b.arrayOffset());
    System.out.println("limit: " + b.limit());
    System.out.println("position: " + b.position());
    System.out.println("remaining: " + b.remaining());
    System.out.print("content from array: ");

    char[] array = b.array();
    for (int i = 0; i < array.length; ++i) {
        if (array[i] == 0) {
            array[i] = '_';
        }
    }

    System.out.println(Arrays.toString(b.array()));
  }

  @Test
  public void testCharBuffer3() {
    CharBuffer b = CharBuffer.wrap(new char[12], 2, 10);
    printBufferInfo(b);
    b.put("abc");
    printBufferInfo(b);
    b.rewind();
    b.put("abcd");
    printBufferInfo(b);
  }

}

输出:

- - - - - - - - - - - - - - -
capacity: 12
length: 10
arrayOffset: 0
limit: 12
position: 2
remaining: 10
content from array: [_, _, _, _, _, _, _, _, _, _, _, _]
- - - - - - - - - - - - - - -
capacity: 12
length: 7
arrayOffset: 0
limit: 12
position: 5
remaining: 7
content from array: [_, _, a, b, c, _, _, _, _, _, _, _]
- - - - - - - - - - - - - - -
capacity: 12
length: 8
arrayOffset: 0
limit: 12
position: 4
remaining: 8
content from array: [a, b, c, d, c, _, _, _, _, _, _, _]

谢谢您!