Java Multithreading

Level : Advanced
Mentor: Shailendra Chauhan
Duration : 00:02:00

What is multithreading in Java?

Multithreading is a feature of Java that allows two or more portions of a program to run concurrently, maximizing CPU utilization. Each component of such a program is referred to as a thread. Thus, threads are lightweight processes within processes.

Benefits of Multithreading in Java

  • Multithreading in Java increases performance and reliability.
  • Multithreading in Java significantly reduces execution time.
  • Multithreading in Java provides a seamless and hassle-free GUI response.
  • The software maintenance costs are reduced.
  • The CPU and other processing resources are properly used.

Disadvantages of Java Multithreading

  • Multithreading in Java complicates code debugging.
  • In Java, the likelihood of a process execution deadlock increases when several threads are used.
  • In worst-case scenarios, the result may be unpredictable.
  • Complications may arise while code is being transferred.

Process vs Threads

  • Threads are contained within processes, whereas processes are standalone.
  • Threads are lightweight, whereas processes are heavy.
  • Threads lack separate memory and resources, whereas processes do.
  • Threads require synchronization, whereas processes do not.
  • Threads share address space for direct communication, while processes communicate via inter-process communication

What is the Main Thread in Java?

When a Java program starts, one thread runs instantly. This is commonly referred to as the program's main thread because it is performed when the program starts.

Properties of Main Thread

  • The main thread creates child threads.
  • The main thread usually finishes last, executing shutdown operations.

Creating a new thread in Java

To create a new thread in Java, first instantiate a class that extends the Thread class or implements the Runnable interface, and then call the start() method to start the new thread's execution.

Thread with Loop in java

In Java, a thread containing a loop is created by enclosing a loop within the run() method of a Thread subclass or a Runnable implementation and then beginning the thread to execute the loop concurrently.

Thread Lifecycle

In Java, a thread can be in any of the following states. The states are:

  • New
  • Active
  • Blocked / Waiting
  • Timed Waiting
  • Terminated
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