Giới thiệu về Thread trong java

Creating Threads• Sub classing Thread: – Creating subclass – Overriding the run method – Starting the thread • Using the Runnable interface: – Implementing the Runnable interface – Impl

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A Guide to Advanced Java - Module 1 - Thread 30/07/2008

Module 1 Introduction to Thread

• Objective

Define Threads

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A Guide to Advanced Java - Module 1 - Thread 30/07/2008

Creating Threads

• Sub classing Thread:

– Creating subclass

– Overriding the run()

method – Starting the thread

• Using the Runnable interface:

– Implementing the Runnable interface – Implementing the run() method

– Starting the thread

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A Guide to Advanced Java - Module 1 - Thread 30/07/2008

Thread states

Methods of the Thread class

• The currentThread() method returns the thread running.

• The getName() method helps to retrieve the name of the

current thread

• The setName() method assigns a name to a thread.

• The start() method allocates the system resources

necessary to run the thread and executes the run()

method of its target object

• The run() method contains instructions, which are

executed when the start() method is invoked

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A Guide to Advanced Java - Module 1 - Thread 30/07/2008

Methods of the Thread class …

Methods of the Thread class …

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Managing Thread

• Thread priority

– Thread.MAX_PRIORITY : constant value of 10

– Thread.NORM_PRIORITY : constant value of 5, default

– Thread.MIN_PRIORITY : constant value of 1

• Methods:

– setPriority()

– getPriority()

• Thread priority helps the thread scheduler to decide

which thread to run

• Priority also helps the OS to decide the amount of

resource that has to be allocated to each thread

Daemon Threads

• setDaemon() method

• isDaemon() method

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Needs for Daemon Thread

Summary

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LAB & Exercises

LAB

1) Extending the Thread class 2) Implementing the Runnable 3) Creating the Thread objects 4) Using sleep() and getName() methods 5) Displaying Thread class method descriptions 6) Setting and getting Thread priorities

Exercises

 Write a thread displaying an electronic clock