import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;
public class Test {
public static void main(String[] args) {
final Lock firstLock = new ReentrantLock();
final Lock secondLock = new ReentrantLock();
firstLock.lock();
Thread secondThread = new Thread(new Runnable() {
public void run() {
secondLock.lock();
firstLock.lock();
}
});
secondThread.start();
try {
Thread.sleep(250);
} catch (InterruptedException e) {
e.printStackTrace();
}
secondLock.lock();
secondLock.unlock();
firstLock.unlock();
}
}
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