Java 8 revolutionized the language with lambdas, streams, and functional programming features. These tutorials help you write modern, expressive Java code using features from Java 8 through Java 21.

• Mastering java.util.function.Supplier in Java
• Working with java.util.function.Consumer in Java
• Understanding java.util.function.Predicate in Java
• What is a Lambda Expression in Java, and How Does it Differ from an Anonymous Inner Class?
• Mastering Optional in Java 8: A Comprehensive Guide
• Modern Java Features: From Java 8 to Java 21
• Using Sealed Classes for Better Domain Modeling in Java

Lambda expressions and the Stream API. They fundamentally change how you write Java code—making it more concise, readable, and functional. Start with lambdas, then move to streams.

Both have their place. Streams are great for data transformation and filtering. For-loops are better for simple iterations and when you need to break early. Our tutorials show when to use each.

Optional is a container that may or may not contain a value. It helps avoid NullPointerException and makes your code's intent clearer. Instead of returning null, return Optional.empty().

Functional interfaces (interfaces with one abstract method) enable lambda expressions. Predicate, Consumer, Supplier, and Function are built-in functional interfaces you'll use constantly.

Java 17 or 21 (LTS versions). They include all Java 8 features plus records, sealed classes, pattern matching, and text blocks. Our tutorials cover features across all modern versions.

Absolutely. Interviewers expect you to write modern Java code. Knowing lambdas, streams, and Optional demonstrates you're current with Java best practices.