一道线程交替读取的面试题

有两个单词的txt文本a.txt和b.txt，a是以换行区分单词，b是 换行或者空格符。写一个程序，交替读取a和b文件中的单词保存在文件c中。
代码如下：

package com.kaiying.face;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.concurrent.locks.Condition;
import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class FileWriteAndReadTest {
	private Lock lock = new ReentrantLock();
	private Condition condition = lock.newCondition();
	private Condition otherCondition = lock.newCondition();
	private OutputStream out;
	private boolean turnA = true;//读A  false 读B文件
	private boolean empty = false;//判断有一个文件的单词全部读完

	public FileWriteAndReadTest() {
		try {
			out = new FileOutputStream("d.txt");
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		}
	}

	class ReadFileA implements Runnable {

		public void run() {
			try {
				lock.lock();
				InputStream in = new FileInputStream("a.txt");
				int r = 0;
				while ((r = in.read()) != -1) {
					while (!turnA) {
						otherCondition.await();
					}
					writeByte(r);
					if (r == 10) {// 换行
						if (!empty) {
							turnA = false;
							System.out.println("A");
							condition.signal();
						}
					}
				}
				turnA = false;
				empty = true;
			} catch (Exception e) {
				e.printStackTrace();
			} finally {
				lock.unlock();
			}
		}
	}

	class ReadFileB implements Runnable {

		public void run() {
			try {
				lock.lock();
				InputStream in = new FileInputStream("b.txt");
				int r = 0;
				while ((r = in.read()) != -1) {
					while (turnA) {
						condition.await();
					}
					writeByte(r);
					if (r == 10 || r == 32) {// 换行  空格
						if (!empty) {
							System.out.println("B");
							turnA = true;
							otherCondition.signal();
						}
					}
				}
				turnA = true;
				empty = true;
			} catch (Exception e) {
				e.printStackTrace();
			} finally {
				lock.unlock();
			}
		}
	}

	public void writeByte(int byteWord) {
		try {
			out.write(byteWord);
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}

	public static void main(String[] args) {
		FileWriteAndReadTest test = new FileWriteAndReadTest();
		ReadFileA fileA = test.new ReadFileA();
		ReadFileB fileB = test.new ReadFileB();
		new Thread(fileA).start();
		new Thread(fileB).start();
	}
}