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copied!<p>You can do the above operation similar like below code. perfect use of producer consumer Thread using <code>wait()</code> and <code>notify()</code>.</p> <p><strong>FileOperator.java</strong></p> <pre><code>public class FileOperator { File file = new File("D:\\Personal\\MyProjects\\File\\file.txt"); BufferedWriter bw; BufferedReader br; boolean isWriteComplete = false; public FileOperator() throws IOException { if(!file.exists()) file.createNewFile(); bw = new BufferedWriter(new FileWriter(file)); br = new BufferedReader(new FileReader(file)); } public void writeInFile(String str) throws IOException{ bw.write(str); bw.newLine(); bw.flush(); } public String readFromFile() throws IOException{ return br.readLine(); } } </code></pre> <p>and here is our <strong>FileReaderWriterDemo.java</strong></p> <pre><code>class ThreadReader implements Runnable{ FileOperator fo; public ThreadReader(FileOperator fo) { super(); this.fo = fo; } @Override public void run() { synchronized (fo) { if(!fo.isWriteComplete){ try { fo.wait(); } catch (InterruptedException e) { e.printStackTrace(); } } System.out.println("--------ORDER DETAILS------"); try { System.out.println(fo.readFromFile()); } catch (IOException e) { e.printStackTrace(); } fo.notify(); } } } class ThreadWriter implements Runnable{ FileOperator fo; public ThreadWriter(FileOperator fo) { super(); this.fo = fo; } @Override public void run() { synchronized (fo) { System.out.println("Going to write..."); try { fo.writeInFile("OrderNo:1 | advancePaid: 2000 | custName: Mr.XXX | mobileModel: Nokia"); } catch (IOException e) { e.printStackTrace(); } fo.isWriteComplete = true; fo.notify(); } } } public class FileReaderWriterDemo { public static void main(String[] args) { FileOperator fop = null; try { fop = new FileOperator(); } catch (IOException e) { e.printStackTrace(); } Thread tr = new Thread(new ThreadWriter(fop)); tr.start(); Thread tw = new Thread(new ThreadReader(fop)); tw.start(); } } </code></pre> <p>Output in console:</p> <p>Going to write</p> <p>--------ORDER DETAILS------</p> <p>OrderNo:1 | advancePaid: 2000 | custName: Mr.XXX | mobileModel: Nokia</p>

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