What is the difference between anonymous classes and lambda expressions?

What is the difference between anonymous classes and lambda expressions?

Anonymous classes are used to create a one-time use class without a name, while lambda expressions provide a more concise way to implement functional interfaces.

Can you give me an example of each?

Sure! An anonymous class might look like this: new Runnable() { public void run() { System.out.println("Running"); } }. A lambda expression for the same would be: () -> System.out.println("Running");.

When should I use one over the other?

Use lambda expressions when you need a simple implementation of a functional interface. Anonymous classes are better for more complex scenarios where you need to maintain state.

Are there any performance differences?

Yes, lambda expressions can be more efficient as they can be optimized by the JVM, while anonymous classes create a new class each time.