Q: give me the class main for this code

import java.util.concurrent.Semaphore;

public class SharedDatabase {

// Semaphore to control access to the database

private Semaphore semaphore;

// Count of the number of readers currently accessing the database

private int readerCount;

// The shared data in the database

private int data;

public SharedDatabase() {

this.semaphore = new Semaphore(1);

this.readerCount = 0;

}

public int readData() throws InterruptedException {

// Acquire the semaphore

semaphore.acquire();

// Increment the number of readers

readerCount++;

// If this is the first reader, acquire the semaphore again to prevent writers from accessing

if (readerCount == 1) {

semaphore.acquire();

}

// Release the semaphore

semaphore.release();

// Read the data

int readData = data;

// Acquire the semaphore

semaphore.acquire();

// Decrement the number of readers

readerCount--;

// If this is the last reader, release the semaphore to allow writers to access

if (readerCount == 0) {

semaphore.release();

}

// Release the semaphore

semaphore.release();

// Return the read data

return readData;

}

public void writeData(int data) throws InterruptedException {

// Acquire the semaphore to prevent readers and other writers from accessing

semaphore.acquire();

// Write the data

this.data = data;

// Release the semaphore to allow readers and other writers to access

semaphore.release();

}

}