java 41 | Threads in java | How to create Threads in java | Runnable interface | Extend Thread clas смотреть онлайн

A thread is a lightweight sub-process, the smallest unit of processing.
At the end of this class students will be able to : -
Understand what is Thread.
Create threads.
Extend the Thread class.
Implement the Runnable interface.
Thread
It is a separate path of execution.
Threads are independent.
If there occurs exception in one thread, it doesn't affect other threads.
It uses a shared memory area.
There can be multiple processes inside the OS, and one process can have multiple threads.

How to create thread
There are two ways to create a thread:
By extending Thread class
By implementing Runnable interface.
Thread class:
Thread class provide constructors and methods to create and perform operations on a thread.
Thread class extends Object class and implements Runnable interface.

By extending Thread class
class Multi extends Thread{  
public void run(){  
System.out.println("thread is running...");  
}  
public static void main(String args[]){  
Multi t1=new Multi();  
t1.start();  
 }  
}  
Output: thread is running...
By implementing Runnable interface.
class Multi3 implements Runnable{  
public void run(){  
System.out.println("thread is running...");  
}  
public static void main(String args[]){  
Multi3 m1=new Multi3();  
Thread t1 =new Thread(m1);  
t1.start();  
 }  
}  Output:thread is running...

If you are not extending the Thread class,your class object would not be treated as a thread object.
So you need to explicitly create Thread class object.
We are passing the object of your class that implements Runnable so that your class run() method may execute.

summary
A thread is a lightweight sub-process, the smallest unit of processing.
There can be multiple processes inside the OS, and one process can have multiple threads.
There are two ways to create a thread:
By extending Thread class
By implementing Runnable interface.

Java: The Complete Reference Book by Herbert Schildt
https://www.youtube.com/playlist?list=PLA3taA2THXpy0q0TxYd4i5dpk76HpsZ_n
https://www.javatpoint.com/creating-thread