Thread model of java

Thread model of java

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  Thread Model ofJava
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  Thread model ofJava • All the class libraries are designed multithreading in mind • Java uses threads to enable entire system to be asynchronous • Once a thread has been started • It can be suspended • Suspended thread can be resumed • It may be stopped 2
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  Thread model ofJava contd.. • Thread features • Creation of threads • Context switch • Thread priorities • Synchronization • Messaging 3
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  Creation of Threads •Java provides two ways for creating threads by • Extending Thread class • Implementing Runnable interface 4
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  Context Switch • Switchfrom one thread to other • Two ways of context switch • Thread can voluntarily relinquish control by • Explicitly yielding • Sleeping • Blocking on pending I/O • Context switch is done by selecting the highest priority thread • Pre-emption • Occurs when a high priority enters while executing a low priority thread 5
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  Thread Priorities • Threadpriorities are simple integers • Ranging from 1 to 10 • A relative measure • Higher the priority – brighter the chances of getting executed first 6
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  Synchronization • As threadsintroduces asynchronous behavior in Java programs • Synchronization is needed when two or more threads work with a shared resource • ‘Monitor’ feature is used in Java to implement Synchronization • Monitors are used mutually exclusive 7
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  Synchronization contd.. • Thereis no special monitor class in Java • Every object has its own implicit monitor • Two ways to show synchronization • synchronized methods • synchronized statements 8
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  Messaging • Java threadscommunicate with each other through • notify() method • wait() method 9
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  Summary In this class,you have learnt • Thread basics • Process • Definition of thread • Comparison of process and thread • Thread model of Java • Features of Java that implemented threads 10
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  Frequently Asked Questions 1.Compare a process and a thread 2. Which methods are useful for messaging in Java 3. Explain the thread model of Java 11
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  Quiz 1. Which oneof the following is a thread ? a) MS-Word b) Windows Explorer c) Spell checker in MS-Word d) Notepad 12
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  Quiz Contd.. 2. Whichstatement is true? a) Thread does not depend on resources of any process b) Each Thread has its own heap memory c) A Thread share heap with other threads d) None
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  Home Exception Handling Graphical User Interface Programming (GUI) Previous Java question papers with Answers for polytechnic diploma (jntu) OCT/NOV-2012 QUESTION PAPER April / May 2012 c-09 October/ November-2011 c-09 April/ May 2011 c-09 APRIL/MAY-2011 (C-05) Internal Lab question paper External Lab question paper BTECH JNTU LAB MANUAL Lab practice Core java interview questions