In what cases is the synchronized modifier used in the code?

The synchronized modifier in Java is used to ensure thread safety when working with shared resources in a multithreaded environment. It guarantees that only one thread at a time can execute a synchronized block or method, preventing race conditions.

It is used in cases where:

• You need to protect a critical section of code that modifies shared data.
• You need to ensure the atomicity of operations.
• You want to avoid concurrent access to an object or method from multiple threads.

Example:

public class Counter {
    private int count = 0;

    public synchronized void increment() {
        count++;
    }

    public synchronized int getCount() {
        return count;
    }
}

Here, the increment and getCount methods are synchronized to prevent incorrect modification and reading of the count variable from different threads.