Easy learning with example program codes

Concurrency in java

Dictionary meaning of concurrency: the fact of two or more events or circumstances happening or existing at the same time.


What is concurrency?

Concurrency refers to the parallel processing. It is the ability to execute more than one programs or more than one parts of the program in parallel without affecting the final outcome.


Note: Threads are the backbone of java concurrency.



A process has a self-contained execution environment i.e. allocates separate memory area. Context switch time is more in case of processes because switch is done between different memory areas.



A thread is a lightweight process. Thread uses process’s execution environment i.e. memory area. Context switch time is less in case of threads because switch is done within the same process’s memory area.


Process vs Thread

                       Process                          Thread
  1. Process has its own main memory for execution.
  2. Process is considered as heavyweight component.
  3. One process can have multiple threads.
  4. Context switch time is more.
  1. Thread use process’s main memory for execution and share it with other threads.
  2. Thread is considered as lightweight component.
  3. One thread can’t have multiple process.
  4. Context switch time is less.

Note: By default, a java application runs independently in one process. We need to use several threads to achieve parallel processing in java application.

Related topics

Posted in Java   

Core Java Tutorial

Programming language overview.
Overview of Java.
Java features
JVM architecture details.
Java Coding Guidelines.
Some important definitions.
Variable and data types.
Hello world java program.
Core java examples programs.
Important Java Programs.
How to set permanent path in java?
OOPs Basics.
Object and Class in Java.
OOPs Principles/Concepts.
Abstraction in java.
Encapsulation in java.
Polymorphism in java.
Method overloading in java.
Method overriding in java.
Dynamic method dispatch.
Runtime polymorphism.
Association in java.
Inheritance in java.
Aggregation in java.
Command line arguments in java.
Command line argument program in eclipse.
Read input from command line using Scanner.
Java array programs
Java star pattern programs
Java number pattern programs
final in java.
Abstract class in java.
Interface in java.
Custom marker Interface in java.
Constructor in java.
Package in java.
Access modifier in java.
Static import in java.
Package class in java.
this in java.
Instance initialize block.
Anonymous block.
super in java.
Static in java.
final in java.
Java cloning deep and shallow
Shallow vs Clone copy
String handling in java.
String handling programs.
StringBuffer in java.
StringBuilder in java.
Exception Handling Tutorial.
Multithreading Tutoial.
Java input output stream tutorial.
Collections framework in java tutorial.
Collections framework programs.
Java Random class
Java annotations.
Java design principles.
Java 7 features
Java 8 features
Java networking tutorial
Java Reflection tutorial

Copyright © 2019 CodesJava Protection Status SiteMap Reference: Java Wiki