Java Thread Wait,NotifyAll
In this segment of tutorial we will learn about the wait and notifyAll methods of the Thread.Then We will create an example which is notifying all the threads at a time.
In this segment of tutorial we will learn about the wait and notifyAll methods of the Thread.Then We will create an example which is notifying all the threads at a time.
- Wait notifyAll both are the methods of the object class.
- notify is used to notify only the first waiting thread.
- notifyAll notifies all the thread to resume their lock
Java Thread Wait Notifyall Example
class passenger extends Thread {
train tr;
public passenger(train trn) {
tr = trn;
}
public void run() {
synchronized (tr) {
try {
System.out.println("Waiting for train...");
tr.wait();
} catch (InterruptedException e) {
}
System.out.println("Total is: " + tr.total);
}
}
public static void main(String[] args) {
train mytrain = new train();
new passenger(mytrain).start();
new passenger(mytrain).start();
new passenger(mytrain).start();
mytrain.start();
}
}
class train extends Thread {
int total;
public void run() {
synchronized (this) {
for (int i = 0; i < 100; i++) {
total += i;
}
notifyAll();
}
}
}
Output
Waiting for train... Waiting for train... Waiting for train... Total is: 4950 Total is: 4950 Total is: 4950
