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    <p>I would really recommend that you go through a tutorial like <a href="http://java.sun.com/docs/books/tutorial/essential/concurrency/" rel="noreferrer">Sun's Java Concurrency</a> before you commence in the magical world of multithreading.</p> <p>There are also a number of good books out (google for "Concurrent Programming in Java", "Java Concurrency in Practice".</p> <p><strong>To get to your answer:</strong></p> <p>In your code that must wait for the <code>dbThread</code>, you must have something like this:</p> <pre><code>//do some work synchronized(objectYouNeedToLockOn){ while (!dbThread.isReady()){ objectYouNeedToLockOn.wait(); } } //continue with work after dbThread is ready </code></pre> <p>In your <code>dbThread</code>'s method, you would need to do something like this:</p> <pre><code>//do db work synchronized(objectYouNeedToLockOn){ //set ready flag to true (so isReady returns true) ready = true; objectYouNeedToLockOn.notifyAll(); } //end thread run method here </code></pre> <p>The <code>objectYouNeedToLockOn</code> I'm using in these examples is preferably the object that you need to manipulate concurrently from each thread, or you could create a separate <code>Object</code> for that purpose (I would not recommend making the methods themselves synchronized):</p> <pre><code>private final Object lock = new Object(); //now use lock in your synchronized blocks </code></pre> <p><strong>To further your understanding:</strong><br> There are other (sometimes better) ways to do the above, e.g. with <code>CountdownLatches</code>, etc. Since Java 5 there are a lot of nifty concurrency classes in the <code>java.util.concurrent</code> package and sub-packages. You really need to find material online to get to know concurrency, or get a good book. </p>
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    1. CONor all thread code can be nicely integrated in objects, if I am not wrong. So I do not think using object synchronization is a good way to implememnt this thread related work.
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