How can I use streams with lambda expressions in Java?

How can I use streams with lambda expressions in Java?

You can use streams in Java to process collections of objects. Lambda expressions allow you to write concise code for operations like filtering, mapping, and reducing.

Can you give me an example of filtering a list using streams and lambda?

Sure! Here's an example:

List<String> names = Arrays.asList("Alice", "Bob", "Charlie");
List<String> filteredNames = names.stream()
    .filter(name -> name.startsWith("A"))
    .collect(Collectors.toList());

This will give you a list containing only "Alice".

What about using map with streams?

You can use the map method to transform each element in the stream. For example:

List<String> names = Arrays.asList("Alice", "Bob", "Charlie");
List<Integer> nameLengths = names.stream()
    .map(String::length)
    .collect(Collectors.toList());

This will give you a list of the lengths of each name.

How do I handle exceptions when using streams?

Handling exceptions in streams can be tricky. One common approach is to wrap the code in a try-catch block within a lambda expression, or to use a custom wrapper method that handles exceptions.