Threading_and_Multi_threading.txt

What is Single Thread?

A single thread is basically a lightweight and the smallest unit of processing. Java uses threads by using a "Thread Class".

There are two types of thread 
– user thread and daemon thread (daemon threads are used when we want to clean the application and are used in the background).

When an application first begins, user thread is created. Post that, we can create many user threads and daemon threads.

What is Multithreading?

Multithreading in java is a process of executing two or more threads simultaneously to maximum utilization of CPU.
Multithreaded applications are where two or more threads run concurrently; hence it is also known as Concurrency in Java.
This multitasking is done, when multiple processes share common resources like CPU, memory, etc.
Each thread runs parallel to each other. Threads don't allocate separate memory area; hence it saves memory.
Also, context switching between threads takes less time.



What is the difference between threading and multithreading?

Multithreaded Programming

1.In this type of programming multiple threads run at the same time.
2.Multi threaded model doesn’t use event loop with polling.
3.CPU time is never wasted.
4.Idle time is minimum.
5.It results in more efficient programs.
6.When one thread is paused due to some reason, other threads run as normal.

Single Threaded Programming

1. In this type of programming a single thread runs at a time.
2. Single threaded model uses a process event loop with polling.
3. CPU time is wasted.
4. Idle time is more.
5. It results in less efficient programs.
6. When one thread is paused, the system waits until this thread is resumed.