Multithreading in Java

Index:

1. What is Thread?
2. Advantages of thread?
3. How Threads are created in java?  
4. Difference between Thread class & Runnable interface?
5. Lifecycle of thread (How thread travels) 

1. What is Thread?

1. Any executable program is called as Thread.

2. Thread is a class in java present in java.lang package

3. Process of executing multiple threads simultaneously is called as MultiThreading.

Consider below example to understanding thread:

Example of Multithreading

In above figure, Thread-1 and Thread-2 are executing at a time so it's called as Multithreading.