Thread notify
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
public class EarlyNotify extends Object {
private List list;
public EarlyNotify() {
list = Collections.synchronizedList(new LinkedList());
}
public String removeItem() throws InterruptedException {
synchronized (list) {
while (list.isEmpty()) {
print("wait()");
list.wait();
print("done with wait()");
}
String item = (String) list.remove(0);
return item;
}
}
public void addItem(String item) {
print("entering");
synchronized (list) {
list.add(item);
print("added: '" + item + "'");
list.notifyAll();
print("notified");
}
print("leaving");
}
private static void print(String msg) {
String name = Thread.currentThread().getName();
System.out.println(name + ": " + msg);
}
public static void main(String[] args) {
final EarlyNotify enf = new EarlyNotify();
Runnable runA = new Runnable() {
public void run() {
try {
String item = enf.removeItem();
print("returned: '" + item + "'");
} catch (InterruptedException ix) {
print("interrupted!");
} catch (Exception x) {
print("threw an Exception!!!\n" + x);
}
}
};
Runnable runB = new Runnable() {
public void run() {
enf.addItem("Hello!");
}
};
try {
Thread threadA1 = new Thread(runA, "A");
threadA1.start();
Thread.sleep(500);
Thread threadA2 = new Thread(runA, "B");
threadA2.start();
Thread.sleep(500);
Thread threadB = new Thread(runB, "C");
threadB.start();
Thread.sleep(1000);
threadA1.interrupt();
threadA2.interrupt();
} catch (InterruptedException x) {
}
}
}
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