Multithreading in Java: Execute Multiple Threads Concurrently

Learn about multithreading in Java, a powerful feature enabling the concurrent execution of multiple threads. Discover how threads, as lightweight sub-processes, share memory space and help optimize memory usage and reduce context-switching time for efficient performance in Java applications.

Multithreading in Java

Multithreading in Java allows executing multiple threads simultaneously. A thread is a lightweight sub-process, sharing memory space. It saves memory and context-switching time.

public class Main {
public static void main(String[] args) {
System.out.println("Hello World");
}
}

Hello World

Advantages of Multithreading

1. Threads are independent; multiple operations can be performed simultaneously.
2. It saves time as many operations can be done together.
3. If an exception occurs in one thread, it doesn't affect others.

Multitasking

Multitasking allows executing multiple tasks simultaneously, utilizing the CPU.

Two types of multitasking:

• Process-based Multitasking (Multiprocessing)
  • Each process has a separate memory area.
  • Processes are heavyweight.
  • High communication cost between processes.
• Thread-based Multitasking (Multithreading)
  • Threads share the same memory area.
  • Threads are lightweight.
  • Low communication cost between threads.

Java Thread

A thread is a separate path of execution. Threads are independent and share memory.

Java Thread Class

The Thread class provides methods to create and manage threads.

Java Thread Methods