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POHow to synchronize methods in java?
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  1. POHow to synchronize methods in java?
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    copied!<p>i have some small problem. I hava some class <strong>Processor</strong> and <strong>Process</strong>. <strong>Process</strong> class have only name and value <strong>Processor</strong> must calculate this value and display it. In turn, <strong>Processor</strong> implement Runnable interface But i have a trouble. When I set process to my Processor, it begin to calculate value, but i want to start another thread with different value of process, and this value set to first thread too. Here is code</p> <pre><code> package ua.edu.lp.controller; import java.util.Random; import ua.edu.lp.controller.processors.FirstProcessor; import ua.edu.lp.controller.processors.MyBaseProcessor; import ua.edu.lp.model.MyProcess; import ua.edu.lp.model.Queue; public class Computer { private Queue&lt;MyProcess&gt; queue; public void run() { MyBaseProcessor myBaseProcessor = new FirstProcessor(); generateQueue(); for (int i = 0; i &lt; queue.getQueue().size(); i++) { MyProcess process = queue.get(i); myBaseProcessor.setProcess(process); Thread thread = new Thread(myBaseProcessor); thread.start(); } } private void generateQueue() { queue = new Queue&lt;MyProcess&gt;(); for (int i = 0; i &lt; 10; i++) { String name = "Process[" + (i + 1) + "]"; MyProcess myProcess = new MyProcess(name, new Random().nextInt(10) + 1); queue.add(myProcess); System.out.println(myProcess.getName() + "\t" + myProcess.getValue()); } } } </code></pre> <p>BaseProcessor</p> <pre><code>package ua.edu.lp.controller.processors; import ua.edu.lp.model.MyProcess; public abstract class MyBaseProcessor implements Runnable { protected MyProcess myProcess; @Override public void run() { synchronized (myProcess) { calculateValue(); } } protected abstract void calculateValue(); public synchronized MyProcess getProcess() { return myProcess; } public synchronized void setProcess(MyProcess myProcess) { synchronized (myProcess) { this.myProcess = myProcess; } } } </code></pre> <p>And FirstProcessor</p> <pre><code>package ua.edu.lp.controller.processors; public class FirstProcessor extends MyBaseProcessor { @Override protected synchronized void calculateValue() { System.out.println("First processor is working..."); int value = this.myProcess.getValue(); int result = (int) Math.pow(value, 2); System.out.println("Pow of " + value + " = " + result); System.out.println("First processor is free"); } } </code></pre> <p>All project you can download from <a href="http://www.sendspace.com/file/5rlmkx" rel="nofollow">http://www.sendspace.com/file/5rlmkx</a></p>
 

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