1. Pemrograman Multithreading Menggunakan Thread Java
Armin Lawi
Program Pascasarjana UNHAS

2. Apa itu thread Alur kontrol yang melewati program
Thread  (high-weight) Process
Process mengalokasi memori
Thread berbagi memori dengan thread lainnya (global memory dan local memory)
Thread kadang disebut light-weight process
Multithreading: Program dengan lebih dari satu thread

3. Single threaded program
class ABC { ….
public void main(..) … .. }
begin
body
end

4. Single- dan Multi-threaded Program
Single-threaded program
Multithreaded program
Eksekusi Thread
Multiple instruction stream
Single instruction stream
Ruang Address
Bersama

5. Multithreaded Program
Main Thread
start
start
start
Thread A
Thread B
Thread C
Thread dapat bertukar data/hasil

6. Mengapa Multithreading Penting
Client 1 Process
Server Process
Server
Threads
Internet
Client 2 Process

7. Membuat thread dalam Java
Membuat class yang meng-extend Thread
Membuat class yang tidak meng-extend Thread tetapi meng-implement Runnable interface

8. Contoh dengan extends Thread
public class ThreadSebutNama extends Thread { public static void main (String[] args) { ThreadSebutNama thread1, thread2; thread1 = new ThreadSebutNama(); thread2 = new ThreadSebutNama(); thread1.start(); //memanggil run thread2.start(); // memanggil run } public void run () { int pause; for (int i=0; i<10; i++) { try { System.out.println(getName() + " sementara dieksekusi."); pause = (int) (Math.random()*3000); sleep(pause); // 0-3 detik catch (InterruptedException e) { System.out.println(e); } } }
Contoh dengan task yang sama!!

9. Contoh Lain
Contoh thread dengan task yang berbeda

10. Contoh dengan implements Runnable
public class RunnableSebutNama implements Runnable { public static void main(String[] args) { Thread thread1 = new Thread(new RunnableSebutNama()); Thread thread2 = new Thread(new RunnableSebutNama()); thread1.start(); thread2.start(); } public void run() { int pause; for (int i=0; i<10; i++) { try { System.out.println(Thread.currentThread().getName() + " sedang dieksekusi."); pause = (int)(Math.random() * 3000); Thread.sleep(pause); catch (InterruptedException e) { System.out.println(e); } } } }
RunnableSebutNama runnable1 = new RunnableSebutNama();
RunnableSebutNama runnable2 = new RunnableSebutNama();
Thread thread1 = new Thread(runnable1)

11. Multithreaded server
MultiEchoServer
MultiEchoClient