Explore multithreading and concurrency concepts in Java, from the basics on upward.

Java for Programmers

Java Multithreading

## Explanation

Java's semaphore can be <code class="mthd">release()-ed</code> or <code class="mthd">acquire()-d</code> for signalling amongst threads. However the important call out when using semaphores is to make sure **that the permits acquired should equal permits returned**. Take a look at the following example, where a runtime exception causes a deadlock.

# Explanation

Java's semaphore can be <code class="mthd">release()-ed</code> or <code class="mthd">acquire()-d</code> for signalling amongst threads. However the important call out when using semaphores is to make sure **that the permits acquired should equal permits returned**. Take a look at the following example, where a runtime exception causes a deadlock.

# Explanation

Java's semaphore can be <code>release()-ed</code> or <code>acquire()-d</code> for signalling amongst threads. However the important call out when using semaphores is to make sure **that the permits acquired should equal permits returned**. Take a look at the following example, where a runtime exception causes a deadlock.

The Basics

Multithreading in Java

Java Memory Model

Java Thread Basics

Semaphore in Java

Explanation