Synchronization on String Literals

Question

In the code below, the `performAction` method synchronizes on a `String` object. What is a potential pitfall of this approach?

```java
public class ImmutableLock {
    private final String lock = "LOCK";
    public void performAction() {
        synchronized(lock) {
            System.out.println("Performing action");
        }
    }
}
```

Accepted Answer

Immutable objects like String can be interned and shared across the program, leading to unexpected contention or deadlocks if other parts synchronize on the same literal.

Answer

The immutability of the String prevents race conditions, making synchronization unnecessary.

Answer

There is no pitfall; synchronizing on any object provides equivalent concurrency protection.

Answer

Synchronizing on immutable objects always ensures thread safety without any drawbacks.

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