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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
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