Java Threads

What is a Java Thread?

A thread in Java is a lightweight process that allows you to perform multiple operations simultaneously, enabling concurrency in your applications. Java provides a built-in support for threads, allowing you to create, manage, and execute them efficiently.

Creating a Thread by Extending the Thread Class

One way to create a thread in Java is by extending the Thread class. You need to override the run() method where you define the task that the thread will execute. Below is an example:

Implementing Runnable Interface

Another way to create a thread in Java is by implementing the Runnable interface. This approach offers more flexibility since your class can extend another class as well. Here is how you can do it:

Thread Lifecycle

Understanding the lifecycle of a thread is crucial for effective thread management. A thread can be in one of the following states:

• New: When a thread is created but not yet started.
• Runnable: When the thread is ready to run and is waiting for CPU time.
• Blocked/Waiting: When the thread is waiting for a monitor lock or for another thread to perform a specific action.
• Timed Waiting: When the thread is waiting for another thread to perform an action for a specified waiting time.
• Terminated: When the thread has finished executing.

Thread Priorities

Java threads have priorities that help the thread scheduler determine when each thread should be allowed to run. Thread priorities are represented by integers ranging from 1 (lowest priority) to 10 (highest priority). By default, a thread will inherit the priority of the thread that created it.