Implementing lazy initialization

You're working on optimizing the startup time of a Java application. The team has identified that creating database connections eagerly is causing unnecessary delays. You need to implement lazy initialization, i.e., creating a connection only if there is none, for the Database class to improve startup performance.

Deze oefening maakt deel uit van de cursus

Optimizing Code in Java

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Oefeninstructies

Create a property client of type DatabaseClient.
Lazily connect to our database.
Return our database client only when connected.

Praktische interactieve oefening

Probeer deze oefening eens door deze voorbeeldcode in te vullen.

public class Main {
    public static void main(String[] args) {}
}

class Database {
	// Create a property for DatabaseClient
    private ____ ____
    
    public DatabaseClient getClient() {
    	// Lazily connect to our database
        if (client ____ ____) {
        	client.connect("https//our-database.com");
        }
        // Return only when connected
      	return ___
    }
}

// This class is simulating a real client connecting to a database
class DatabaseClient {
    public void connect(String connectionUrl) {}
}

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