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我單獨測試了一下一個漢字的gbk編碼，為什么測出來長度是三，不應該是2嗎

package?com.imooc.io;

import?java.io.File;
import?java.io.IOException;
import?java.io.RandomAccessFile;

import?sun.font.CreatedFontTracker;

public?class?RafDemo?{

	/**
	?*?@param?args
	?*?@throws?IOException?
	?*/
	public?static?void?main(String[]?args)?throws?IOException?{
		//?TODO?Auto-generated?method?stub
		File?demo=new?File("demo");
		if(!demo.exists()){
			demo.mkdir();
		}
		File?file=new?File(demo,"raf.dat");
		if(!file.exists()){
			file.createNewFile();
		}
		RandomAccessFile?raf=new?RandomAccessFile(file,?"rw");

		String?s="中?";
		byte[]?gbk=s.getBytes("gbk");
		raf.write(gbk);
		System.out.println("指針的位置："+raf.getFilePointer());
		System.out.println("長度："+raf.length());
	}

}