Java threads are one of the most fundamental aspects of the language, and yet they are often misunderstood. In this article, we’ll try to clear up some of the confusion surrounding threads and provide a few simple rules to help you know when and how to use them.

First, let’s start with a quick definition. A thread is simply a process that can be run concurrently with other processes. In other words, a thread is like a mini-program that can be executed independently of the main program.

One common misconception about threads is that they are used to make programs run faster. This is not necessarily true. Threads can actually make programs run slower if they are not used correctly.

What is thread in java

A thread is a separate path of execution within a program. In Java, threads are implemented as instances of the Thread class. When you create a new Thread instance, you must specify the code that the thread will execute. This is done by passing a Runnable object to the Thread constructor. The Runnable interface defines a single method, run(), which contains the code that will be executed by the thread.

Difference between thread and process

A process can be thought of as a program that is being executed. A thread is a single path of execution within that program. Threads are sometimes called light-weight processes because they share the same address space as the process that created them. This means that threads can communicate with each other more easily than processes can.

Threads also have some other benefits over processes. For example, threads can be created and destroyed more quickly than processes. They are also less resource-intensive than processes. However, there are some trade-offs that come with using threads. Because they share the same address space, threads can interfere with each other if they are not properly synchronized.

How to create a thread in Java

Creating a new thread in Java is pretty simple. You just need to create a new Thread object and pass it a Runnable object. The Runnable object contains the code that will be executed by the new thread.

Here’s a simple example:

public class MyThread implements Runnable {

public void run() {

// Code that will be executed by the new thread


public static void main(String[] args) {

Thread myThread = new Thread(new MyThread());




When to use threads in Java

There are two common reasons to use threads in Java.

The first reason is to make your program more responsive. If your program has a long-running task, you can use a thread to execute that task in the background while the rest of the program continues to run. This way, the user won’t have to wait for the task to complete before they can use the program.

The second reason to use threads is to improve performance. If your program has multiple tasks that can be executed concurrently, you can use threads to execute those tasks at the same time. This can make your program run faster because the tasks will be executed in parallel.