1. Introduction
In Java, threads are instances of the Thread
class or objects implementing the Runnable
interface. A Java program itself is a single thread called the “main” thread.
2. Creating Threads
a. Extending the Thread
Class
b. Implementing the Runnable
Interface
3. Thread Lifecycle
Threads in Java go through different states, including NEW
, RUNNABLE
, BLOCKED
, WAITING
, TIMED_WAITING
, and TERMINATED
. Understanding these states is crucial for effective thread management.
4. Thread Synchronization
In a multithreaded environment, synchronization is essential to avoid data inconsistency issues. Java provides the synchronized
keyword and the lock
framework for this purpose.
a. Synchronized Method
b. Lock Framework
5. Thread Pools
Creating and managing threads individually can be resource-intensive. Java provides the ExecutorService
framework to manage thread pools efficiently.
Conclusion
Understanding threads in Java is crucial for building concurrent and scalable applications. This tutorial covered the basics of creating threads, managing their lifecycle, synchronizing access to shared resources, and using thread pools. Multithreading is a powerful tool, but it requires careful consideration to avoid common pitfalls like race conditions and deadlocks.