Multithreading in Java for Beginners
In Java multithreading is a process of executing multiple threads simultaneously.
Before we understand what is Thread in Java we must know about process, kernel, and context switching.
Process:
A process is a sequence of execution of a program or we can say that it is an abstraction of hardware and kernel.
Kernel:
A kernel is an interface or fundamental component of the operating system that acts between software applications and the computer hardware.
Context Switching:
In an operating system, context switching is the process between user mode to kernel mode to execute the system call.
What is Thread in Java?
we know already that thread is a lightweight process, but it is a sub-task of a process that shares the same address space as that process.
In Java we can achieve Multithreading in 3 ways:
Thread Class:
Runnable Interface:
-> In Java runnable interface is used to define the task that can
be run as a thread. It has only one method void run() that can
be called when the thread is started.
-> It is a functional interface.
-> Functional Interface:
A functional Interface in Java is an interface that contains
only one abstract method.
Lambda Expression:
A lambda expression is a short block of code that takes in parameters and returns a value. Lambda expressions are similar to methods, but they do not need a name and they can be implemented
right in the body of a method
