interactive java note - m06_un012_p01

8/3/2019 Interactive Java Note - M06_UN012_P01

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Programming Language (JAVA)

Unit 6.12 - Basics of Threading

Presentation 1



Revision

1. Define an applet and explain its lifecycle.

2. State the differences between applet and

application?

3. Describe the use of graphic class.



Objectives

At the end of this presentation, you will beable to

• Explain the need of multitasking

• Recognize the concurrent execution ofmultithreaded applications

• Describe the uses of threads



Thread – Definition

Thread can be defined as single, sequentialflow of control within a program.



Thread – Types

Are of two types

• Single thread

• Multiple threads



Single threaded Application

• A task or process that is made up of only onethread is single-thread.

• A program that supports single thread iscalled single threaded application.



Multi-threaded Application

• A task or process that is made of more thanone thread is multiple threading.

• A program that supports more than onethread is multi-threaded application



Multi-tasking

• Is the ability of an operating system toexecute more than one program

simultaneously.



Difference Between Multitasking andMultithreading

S.No: Multitasking Multithreading

1. More than one program getsexecuted simultaneously.

More than one part of a programcalled threads is executedsimultaneously.

2. Multitasking is a timesharingprocess. CPU switches fromone program to anotherprogram so quickly tocomplete all the programs

simultaneously.

Multithreading is also a timesharingprocess. CPU switches from oneactivity to another activity within theprogram so quickly to complete allthe activities simultaneously.

3. Since each program occupiesdifferent memory location,Multitasking is called asheavyweight process

Multithreading is a light weightprocess because the activities/ threads share the same memoryspace.



Uses of Threads

• A program can be split into separate tasksand further into threads. This increases theeffective usage of CPU during execution.

• The popularity of threading increased withGraphical User Interfaces. Threading systemallowed the user to attain better performance

in a program.• The introduction of threads created an illusion

that the program's performance was faster.



Importance of Threads

• In a Java program, one thread need not waitfor another thread to complete. This is called

asynchronous behaviour of threads.• Java provides few techniques to handle the

asynchronous behaviour of threads.

• Minimise the CPU's idle time.



Summary

In this presentation, you learnt the following

• Threads can be defined as single, sequential flow of

control within a program.• The two types of threads are single and multiple

threads

• A program that supports single thread is single

threaded application.

• A program that supports more than one thread ismulti-threaded application.

• Multi-Tasking is the ability of an operating system toexecute more than one program simultaneously.

interactive java note - m06_un012_p01

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