import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

class Deadlock {
    static Lock lock1 = new ReentrantLock();
    static Lock lock2 = new ReentrantLock();

    public static void metode1(boolean first) {
        System.out.println("Starter metode");
        lock1.lock();
        try {
            if (first) metode2(false);

            System.out.println("Ferdig med metode");
        } finally {
            lock1.unlock();
        }
    }

    public static void metode2(boolean first) {
        System.out.println("Starter metode2");
        lock2.lock();
        try {
            if (first) metode1(false);

            System.out.println("Ferdig med metode2");
        } finally {
            lock2.unlock();
        }
    }

    public static void main(String[] args) {
        for (int i = 0; i <3; i++) {
            new Thread(() -> metode1(true)).start();
            new Thread(() -> metode2(true)).start();
        }
    }
}