Java threads.
public class MyThread extends Thread {
private String name;
private long startTime;
private boolean stop;
private int counter;
public MyThread(String name) {
this.name = name;
startTime = System.currentTimeMillis();
}
public synchronized int incrementCounter() {
int current = counter;
counter++;
return current;
}
public void run() {
while(!stop) {
// keep running
}
}
public void print() {
System.out.println("My name is " + name + ", my counter is " + counter + "my stop is " + stop);
long now = System.currentTimeMillis();
System.out.println("I've been running for " + (now - startTime) + " milliseconds");
}
public void stopThread() {
stop = true;
}
}
public class ThreadsDemo {
public static void main(String[] args) {
MyThread thread1 = new MyThread("One");
thread1.start();
MyThread thread2 = new MyThread("Two");
thread2.start();
System.out.println(thread1.getState());
System.out.println(thread2.getState());
thread1.incrementCounter();
thread2.incrementCounter();
System.out.println(thread1.getState());
System.out.println(thread2.getState());
System.out.println(thread1.isAlive());
System.out.println(thread2.isAlive());
thread1.print();
thread2.print();
thread1.stopThread();
// sleep the current thread
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(thread1.getState());
System.out.println(thread2.getState());
thread1.stopThread();
System.out.println(thread1.isAlive());
System.out.println(thread2.isAlive());
// sleep the current thread
try {
Thread.sleep(100);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
System.out.println(thread1.getState());
System.out.println(thread2.getState());
thread2.stopThread();
System.out.println(thread1.isAlive());
System.out.println(thread2.isAlive());
thread1.print();
thread2.print();
System.out.println("both threads are done");
MyThread[] threads = new MyThread[100];
for (int i = 0; i < 100; ++i) {
threads[i] = new MyThread(new Integer(i).toString());
threads[i].start();
}
for (MyThread thread : threads) {
thread.incrementCounter();
thread.print();
}
for (MyThread thread : threads) {
System.out.println(thread.getState());
}
for (MyThread thread : threads) {
thread.stopThread();
}
try {
Thread.sleep(20);
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for (MyThread thread : threads) {
System.out.println(thread.getState());
}
try {
for (MyThread thread : threads) {
thread.join();
}
System.out.println("All threads done");
} catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
CSci 4651
course web site.