public class Task290725 {
    public static void main(String[] args) {
        Object lock1 = new Object();
        Object lock2 = new Object();
        
        new Thread(() -> {
            synchronized(lock1) {
                synchronized(lock2) {
                    System.out.println("Thread 1");
                }
            }
        }).start();
        
        new Thread(() -> {
            synchronized(lock1) {
                synchronized(lock2) {
                    System.out.println("Thread 2");
                }
            }
        }).start();
    }
}

public class Task300725 {
    public static void main(String[] args) {
        Object lock = new Object();
        
        synchronized (lock) {
            try {
                lock.wait();
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
        
        System.out.println("Done");
    }
}

import java.util.concurrent.*;

public class Task310725 {
    public static void main(String[] args) throws Exception {
        Callable<String> task = () -> "Result";
        FutureTask<String> future = new FutureTask<>(task);
        
        new Thread(future).start();
        System.out.println(future.get());
    }
}