What are some examples of higher-order functions in Java?

What are some examples of higher-order functions in Java?

Higher-order functions are functions that can take other functions as arguments or return them. In Java, examples include methods like map, filter, and reduce in the Stream API.

Can you explain how the map function works?

Sure! The map function applies a given function to each element of a stream and returns a new stream with the transformed elements. For example, you can use it to square each number in a list.

What about the filter function?

The filter function allows you to select elements from a stream that match a certain condition. It takes a predicate as an argument and returns a new stream containing only the elements that satisfy the predicate.

Can you give me a code example of using reduce?

Certainly! Here's a simple example: int sum = numbers.stream().reduce(0, Integer::sum); This sums up all the integers in the list.