filter values only if not null using lambda in java8
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Filtering Non-Null Values with Lambda Expressions in Java 8
This tutorial will guide you through filtering out `null` values from collections using lambda expressions in Java 8. We'll cover the basics of lambda expressions, different ways to filter using the `Stream` API, and various scenarios with code examples to illustrate the concepts.
*1. Understanding Lambda Expressions and the Stream API*
Before we dive into filtering, let's briefly review lambda expressions and the Stream API, which are fundamental to this process.
*Lambda Expressions:* Lambda expressions are anonymous functions (functions without a name) that can be treated as values. They provide a concise way to represent functional interfaces (interfaces with a single abstract method).
The basic syntax is: `(parameters) - { body }`
For example: `(x, y) - x + y` is a lambda expression that adds two numbers.
*Stream API:* The Stream API, introduced in Java 8, allows you to process collections of objects (lists, sets, arrays, etc.) in a declarative and functional style. It provides methods for filtering, mapping, sorting, and performing other operations on collections without modifying the original collection.
Streams don't store data; they act as a pipeline that transforms and processes data from a source (like a collection).
*2. Filtering Null Values using `Stream.filter()`*
The core method for filtering in the Stream API is `filter()`. It accepts a `Predicate` (a functional interface that takes an argument and returns a boolean) that determines whether an element should be included in the resulting stream.
To filter out `null` values, we can create a `Predicate` that checks if an element is not `null`. The lambda expression makes this very concise.
*Basic Example: Filtering Nulls from a List of Strings*
*Explanation:*
1. *`names.stream()`:* Creates a stream from the `names` list.
2. *`.filter(name - name != null)`:* This is the key part.
`filte ...
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