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Can we synchronize a run() method in Java?
Yes, we can synchronize a run() method in Java, but it is not required because this method has been executed by a single thread only. Hence synchronization is not needed for the run() method. It is good practice to synchronize a non-static method of other class because it is invoked by multiple threads at the same time.
Example
public class SynchronizeRunMethodTest implements Runnable {
public synchronized void run() {
System.out.println(Thread.currentThread().getName() + " is starting");
for(int i=0; i < 5; i++) {
try {
Thread.sleep(1000);
System.out.println(Thread.currentThread().getName() + " is running");
} catch(InterruptedException ie) {
ie.printStackTrace();
}
}
System.out.println(Thread.currentThread().getName() + " is finished");
}
public static void main(String[] args) {
SynchronizeRunMethodTest test = new SynchronizeRunMethodTest();
Thread t1 = new Thread(test);
Thread t2 = new Thread(test);
t1.start();
t2.start();
}
}Output
Thread-0 is starting Thread-0 is running Thread-0 is running Thread-0 is running Thread-0 is running Thread-0 is running Thread-0 is finished Thread-1 is starting Thread-1 is running Thread-1 is running Thread-1 is running Thread-1 is running Thread-1 is running Thread-1 is finished
Updated on 02-Jul-2020 13:17:19
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