Parallel task - solution with CountDownLatch

import java.util.concurrent.CountDownLatch;

public class DashboardLoader {

    public void loadDashboard() throws InterruptedException {
        long start = System.currentTimeMillis();

        CountDownLatch latch = new CountDownLatch(3);

        new Thread(() -> {
            try {
                loadUserData();
            } catch (InterruptedException ignored) {
            } finally {
                latch.countDown();
            }
        }).start();

        new Thread(() -> {
            try {
                loadOrderHistory();
            } catch (InterruptedException ignored) {
            } finally {
                latch.countDown();
            }
        }).start();

        new Thread(() -> {
            try {
                loadRecommendations();
            } catch (InterruptedException ignored) {
            } finally {
                latch.countDown();
            }
        }).start();

        latch.await();

        System.out.println("All data loaded");
        System.out.println("Total time: " +
                (System.currentTimeMillis() - start) + " ms");
    }

    private void loadUserData() throws InterruptedException {
        Thread.sleep(2000);
        System.out.println("User data loaded");
    }

    private void loadOrderHistory() throws InterruptedException {
        Thread.sleep(3000);
        System.out.println("Order history loaded");
    }

    private void loadRecommendations() throws InterruptedException {
        Thread.sleep(2500);
        System.out.println("Recommendations loaded");
    }
}