<div>
Since the getItem() method is not synchronized, there is nothing stopping it from executing at the same time as the putItem() method. So, yes, both methods could be running at once.
</div>


Since the getItem() method is not synchronized, there is nothing stopping it from executing at the same time as the putItem() method. So, yes, both methods could be running at once.

<div>
Ok but if thread 1 gets in the putItem method and locks on the hashmap, how can another thread lock on the same item in the getItem method?
</div>


Ok but if thread 1 gets in the putItem method and locks on the hashmap, how can another thread lock on the same item in the getItem method?

<div>
<div class="content wysiwyg-content">
Hi,<br />
My question is the following, &nbsp;take a look at the code, one method is synchronized, the other is not. &nbsp;The hashmap itself is not synchronized. &nbsp;Is it possible for 2 threads to ever be here: ie: one thread is in the synchronized put block, and another thread is in the getItem method?<br />
<br />
Why? Why Not? &nbsp;Im pretty sure this is impossible for it to happen but i am not 100% sure.<br />
<br />
Thanks<br />

<pre><code id="code-8168992">public class Test{
 private HashMap map = new HashMap();

public synchronized void putItem(Object x){
//put code
}

public Object getItem(Object x){
//get code
}
}</code></pre>
</div>
</div>


Hi,
My question is the following,  take a look at the code, one method is synchronized, the other is not.  The hashmap itself is not synchronized.  Is it possible for 2 threads to ever be here: ie: one thread is in the synchronized put block, and another thread is in the getItem method?

Why? Why Not?  Im pretty sure this is impossible for it to happen but i am not 100% sure.

Thanks

synchronization java hashmap

Java is a platform-independent, object-oriented programming language and run-time environment, designed to have as few implementation dependencies as possible such that developers can write one set of code across all platforms using libraries. Most devices will not run Java natively, and require a run-time component to be installed in order to execute a Java program.

Java

Java Enterprise Edition (Java EE) is a specification defining a collection of Java-based server and client technologies and how they interoperate. Java EE specifies server and client architectures and uses profiles to define technology sets targeted at specific classes of applications. All Java EE profiles share a set of common features, such as naming and resource injection, packaging rules and security requirements.

Java EE

Programming includes both the specifics of the language you’re using, like Visual Basic, .NET, Java and others, but also the best practices in user experience and interfaces and the management of projects, version control and development. Other programming topics are related to web and cloud development and system and hardware programming.