Java Thread Race Condition

Question

Which statement best describes a potential concurrency issue in the following program?

```java
public class Counter {
    private int count = 0;
    public void increment() { count++; }
    public int getCount() { return count; }
}

public class Worker extends Thread {
    private Counter counter;
    public Worker(Counter counter) { this.counter = counter; }
    public void run() {
        for (int i = 0; i < 1000; i++) {
            counter.increment();
        }
    }
}

public class Main {
    public static void main(String[] args) throws InterruptedException {
        Counter c = new Counter();
        Thread t1 = new Worker(c);
        Thread t2 = new Worker(c);
        t1.start();
        t2.start();
        t1.join();
        t2.join();
        System.out.println("Count is: " + c.getCount());
    }
}
```

Accepted Answer

The unsynchronized increment() method creates a race condition as threads concurrently modify the shared variable 'count'.

Answer

The join() calls could throw a checked exception leading to unexpected termination.

Answer

There is a compile-time error due to incorrect thread instantiation.

Answer

A deadlock occurs because threads wait on each other to complete.

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