Java 8 Features

This repository focuses on showcasing several useful features introduced in Java 8. Each feature is covered in a distinct package and named accordingly:

1. Lambda Expressions
2. Streams
3. Default Methods
4. Optional
5. Functional Interfaces
6. Parallel Streams
7. Date and Time API

1. Lambda Expressions

Under the LambdaExpressions package, you'll find the MathOperation interface. Implementations of this interface will demonstrate how to use lambda expressions to carry out different mathematical operations like addition, subtraction, multiplication, and division.

2. Streams

In the Streams package, there's an example of how to use Java 8's Stream API. Given a list of strings, the task is to filter out all strings that start with a lowercase letter and collect the remaining strings into a list.

3. Default Methods

Check out the DefaultMethods package for an introduction to default methods in interfaces. There, we have the Person interface with a default method greet() which prints a greeting message that includes the person's name.

4. Optional

Explore the Optional package to see how to use the Optional class for better null handling. The findString() method returns an Optional that may or may not contain a string, depending on whether a match is found in a given list of strings.

5. Functional Interfaces

In the FunctionalInterfaces package, there are examples that use the java.util.function package. A Predicate filters all numbers greater than 5 from a list of integers. A Function maps a list of strings into their lengths. A Consumer iterates over a list of numbers and prints them.

6. Parallel Streams

The ParallelStreams package shows how to use parallel streams. Given a list of integers, the goal is to use a parallel stream to calculate the sum of the squares of each number.

7. Date and Time API

Finally, in the DateTimeAPI package, we use the java.time package to calculate the number of days between two dates and to add an arbitrary number of days to a given date.

Feel free to dive into each package and explore these features further. Happy coding!

Contributing

Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.

License

MIT