Java Thread Synchronization Issues

Question

In a multi-threaded context, what major problem can occur with the implementation of FlagCheck?
 
```java
public class FlagCheck {
    private boolean flag = false;
    
    public void setTrue() { flag = true; }
    
    public void waitForFlag() {
        while(!flag) {
            // busy-wait
        }
        System.out.println("Flag is true");
    }
}
```

Accepted Answer

Race condition and memory visibility issues because 'flag' is neither volatile nor accessed within a synchronized block.

Answer

An infinite loop due to improper use of the volatile keyword.

Answer

Deadlock since the busy-wait loop prevents lock release.

Answer

The program will always compile with no runtime issues.

Question Leaderboard