初学者关于读写文件加锁 基础问题一点 报占用一点小疑惑 百思不得其解 求解答

package interview_prepared;



import java.io.File;



//实现文件读写加锁



import java.io.FileInputStream;

import java.io.FileNotFoundException;

import java.io.FileOutputStream;

import java.io.IOException;

import java.nio.Buffer;

import java.nio.ByteBuffer;

import java.nio.channels.FileChannel;

import java.nio.channels.FileLock;



public class FileReadWrite 

{



	public static void main(String[] args) throws IOException, InterruptedException 

	{

		//String path = Thread.currentThread().getContextClassLoader().getResource("F:\\java\\java_code\\review\\ReadFile.java").getPath();

		File file = new File("F:\\java\\java_code\\review\\ReadFile.java");

		try 

		{

			

			FileInputStream fis = new FileInputStream(file);

			FileOutputStream fos = new FileOutputStream("writehere.txt");

			FileChannel fcin = fis.getChannel();

			FileChannel fcout = fos.getChannel();

			FileLock flin = null;

			 while(true){  

	                try {

						flin = fcin.tryLock();

						break;

					} catch (Exception e) {

						 System.out.println("有其他线程正在操作该文件，当前线程休眠1000毫秒"); 

						 Thread.sleep(1000); 

					}

					

	            } 

			ByteBuffer bbuffin = ByteBuffer.allocate(32);

			

		

			while(fcin.read(bbuffin)!= -1)

			{

				bbuffin.flip();

				FileLock flout = fcout.tryLock();

				fcout.write(bbuffin);

				flout.release();

				System.out.println(bbuffin);

				bbuffin.clear();

			}

			flin.release();

			fos.close();

			fis.close();

			

		} 

		catch (FileNotFoundException e) 

		{

			

			e.printStackTrace();

		}

		



	}



}