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public class ProducerComsumer extends Object {
private Object slot;
public ProducerComsumer() {
slot = null; // null indicates empty
}
public synchronized void putIn(Object obj)
throws InterruptedException {
while ( slot != null ) {
wait();
}
slot = obj; // put object into slot
notifyAll(); // signal that slot has been filled
}
public synchronized Object takeOut()
throws InterruptedException {
while ( slot == null ) {
wait(); // wait while slot is empty
}
Object obj = slot;
slot = null; // mark slot as empty
notifyAll(); // signal that slot is empty
return obj;
}
public static void main(String[] args) {
final ProducerComsumer ch = new ProducerComsumer();
Runnable runA = new Runnable() {
public void run() {
try {
String str;
Thread.sleep(500);
str = "multithreaded";
ch.putIn(str);
str = "programming";
ch.putIn(str);
str = "with Java";
ch.putIn(str);
} catch ( InterruptedException x ) {
x.printStackTrace();
}
}
};
Runnable runB = new Runnable() {
public void run() {
try {
Object obj;
obj = ch.takeOut();
System.out.println("in run() - just took out: '" +
obj + "'");
Thread.sleep(500);
obj = ch.takeOut();
System.out.println("in run() - just took out: '" +
obj + "'");
obj = ch.takeOut();
System.out.println("in run() - just took out: '" +
obj + "'");
} catch ( InterruptedException x ) {
x.printStackTrace();
}
}
};
Thread threadA = new Thread(runA, "threadA");
threadA.start();
Thread threadB = new Thread(runB, "threadB");
threadB.start();
}
}
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