![An example
15
class MyThread implements Runnable
{
public void run()
{
System.out.println(" this thread is running ... ");
}
} // end class MyThread
class ThreadEx2
{
public static void main(String [] args ) {
Thread t = new Thread(new MyThread());
// due to implementing the Runnable interface
// I can call start(), and this will call run().
t.start();
} // end main()
} // end class ThreadEx2
RAJESHREE KHANDE](https://image.slidesharecdn.com/multithreadingprogramming-200516102334/85/Java-Multi-threading-programming-15-320.jpg)
Java Multi-threading programming
- 1. Multithreading Programming Multithreading is conceptual programming where a program (processes) are divided into two or more subprograms (processes). A thread is similar to program that has a single flow of control It has beginning , body , an end and executes command Sequentially Every program will have at least one thread. 1 RAJESHREE KHANDE
- 2. What are Threads? A piece of code that run in concurrent with other threads. Each thread is a statically ordered sequence of instructions. Threads are being extensively used express concurrency on both single and multiprocessors machines. 2 RAJESHREE KHANDE
- 3. A single threaded program class ABC { …. public void main(..) { … .. } } begin body end 3 RAJESHREE KHANDE
- 4. A Multithreaded Program Main Thread Thread A Thread B Thread C start start start Threads may switch or exchange data/results Main Method Module SwitchingSwitching 4 RAJESHREE KHANDE
- 5. Printing Thread Editing Thread Modern Applications need Threads (ex1): Editing and Printing documents in background. 5 RAJESHREE KHANDE
- 6. Thread Class Multithreading System built upon Thread class it’s method, it’s interface Runnable. To create a new Thread , either extends Thread or implement the Runnable interface Thread class defines several Methods. Some of the method are 1) getName() : Obtain a thread Name. 6 RAJESHREE KHANDE
- 7. Thread Class 2) getPriority() : Obtain a Thread Priority 3) isAlive() : Determine if the thread is still running 4) join() : Wait for thread to terminate. 5) run() : Entry point for the thread. 6) sleep() : Suspend a thread for a period of time. 7) start() : Start a thread by calling it’s run() method 7 RAJESHREE KHANDE
- 8. Creating Thread Java threads may be created by: 1. Extending Thread class 2. Implementing the Runnable interface Java threads are managed by the JVM. 8 RAJESHREE KHANDE
- 9. 1. Extending Thread class Declare a class as extending the Thread class Create instance of that class This class must override the run() method which is entry point for the new thread. It must also call start() to begin the execution of new thread. 9 RAJESHREE KHANDE
- 10. Extending Thread class Syntax class MyThread extends Thread { public void run() { // thread body of execution } } 10 RAJESHREE KHANDE
- 11. Create a thread: MyThread thr1 = new MyThread(); Start Execution of threads: thr1.start(); Create and Execute: new MyThread().start(); 1.Extending Thread class 11 RAJESHREE KHANDE
- 12. The Main Thread When Java Program start up one thread begins immediately called Main Thread. It can be control through a object Thread For this obtain a reference to it by calling the method currentThread() which is public static member of Thread It’s General Form static Thread CurrentThread() 12 RAJESHREE KHANDE
- 13. Life Cycle of Thread 13 new runnable non-runnable dead wait() sleep() suspend() blocked notify() slept resume() unblocked start() stop() RAJESHREE KHANDE
- 14. 2: Threads by implementing Runnable interface class MyThread implements Runnable { ..... public void run() { // thread body of execution } } Creating Object: MyThread myObject = new MyThread(); Creating Thread Object: Thread thr1 = new Thread( myObject ); Start Execution: thr1.start(); 14 RAJESHREE KHANDE
- 15. An example 15 class MyThread implements Runnable { public void run() { System.out.println(" this thread is running ... "); } } // end class MyThread class ThreadEx2 { public static void main(String [] args ) { Thread t = new Thread(new MyThread()); // due to implementing the Runnable interface // I can call start(), and this will call run(). t.start(); } // end main() } // end class ThreadEx2 RAJESHREE KHANDE