Which Java design pattern is often used to handle database connections efficiently?Question 2Answera.Singletonb.Observerc.Factoryd.Proxy

The Singleton design pattern is often used to handle database connections efficiently in Java. This pattern restricts the instantiation of a class to a single instance and provides a global point of access to it. In the context of database connections, using the Singleton pattern can help to prevent unnecessary connections, reduce memory usage, and improve application performance.

Here's a step-by-step explanation:

1. The Singleton pattern is a design pattern that restricts the instantiation of a class to a single instance. This means that there can only be one instance of the class in the JVM.

2. This pattern is often used in scenarios where system-wide actions need to be coordinated from a single central place. An example of this is a database connection pool.

3. The Singleton pattern provides a global point of access to the instance, which can be particularly useful for controlling access to shared resources such as database connections.

4. When a database connection is required, the existing instance of the connection is used instead of creating a new one. This can help to prevent unnecessary connections, reduce memory usage, and improve application performance.

5. Therefore, the Singleton pattern is often used to handle database connections efficiently in Java.

So, the answer to your question is a. Singleton.