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Java

614What Are Static Nested Classes?
615Declaring and Instantiating Static Nested Classes
616Access to Outer Class Members
617Access Modifiers for Static Nested Classes
618Organizing Related Classes with Static Nested Classes
619Static Nested Classes vs Top-Level Classes
620Builder Pattern with Static Nested Classes
621Common Use Cases and Best Practices
622What Are Inner Classes?
623Declaring an Inner Class
624Instantiating Inner Classes: The Outer.new Syntax
625Accessing Outer Class Fields from Inner Classes
626Accessing Outer Class Methods from Inner Classes
627The Implicit Outer Reference
628Qualifying this: OuterClass.this
629Shadowing and Name Resolution in Inner Classes
630Inner Classes and Encapsulation
631Memory Implications of Inner Classes
632What Are Local Classes?
633Declaring and Instantiating Local Classes
634Accessing Local Variables from Local Classes
635Effectively Final Requirement
636Accessing Enclosing Class Members
637Scope and Shadowing in Local Classes
638Local Classes vs Anonymous Classes
639Practical Use Cases for Local Classes
640What Are Anonymous Classes?
641Anonymous Class Syntax
642Implementing Interfaces with Anonymous Classes
643Extending Classes with Anonymous Classes
644Accessing Enclosing Scope Variables
645Limitations: No Constructors
646Use Case: Event Handlers and Callbacks
647Use Case: Comparators and Functional Interfaces
648Use Case: Thread Runnable Implementation
649When to Prefer Lambdas Over Anonymous Classes
650Anonymous Classes as Functional Interface Implementations
651Basic Lambda Conversion: Removing Boilerplate
652Lambda Conversions with Parameters and Return Values
653When Lambda Conversion Is Not Possible
654Method References as Further Simplification
655this and super Semantics: Key Differences
656Variable Capture: Effectively Final Requirement
657Practical Migration: Collections and Event Handlers

Java

614What Are Static Nested Classes?
615Declaring and Instantiating Static Nested Classes
616Access to Outer Class Members
617Access Modifiers for Static Nested Classes
618Organizing Related Classes with Static Nested Classes
619Static Nested Classes vs Top-Level Classes
620Builder Pattern with Static Nested Classes
621Common Use Cases and Best Practices
622What Are Inner Classes?
623Declaring an Inner Class
624Instantiating Inner Classes: The Outer.new Syntax
625Accessing Outer Class Fields from Inner Classes
626Accessing Outer Class Methods from Inner Classes
627The Implicit Outer Reference
628Qualifying this: OuterClass.this
629Shadowing and Name Resolution in Inner Classes
630Inner Classes and Encapsulation
631Memory Implications of Inner Classes
632What Are Local Classes?
633Declaring and Instantiating Local Classes
634Accessing Local Variables from Local Classes
635Effectively Final Requirement
636Accessing Enclosing Class Members
637Scope and Shadowing in Local Classes
638Local Classes vs Anonymous Classes
639Practical Use Cases for Local Classes
640What Are Anonymous Classes?
641Anonymous Class Syntax
642Implementing Interfaces with Anonymous Classes
643Extending Classes with Anonymous Classes
644Accessing Enclosing Scope Variables
645Limitations: No Constructors
646Use Case: Event Handlers and Callbacks
647Use Case: Comparators and Functional Interfaces
648Use Case: Thread Runnable Implementation
649When to Prefer Lambdas Over Anonymous Classes
650Anonymous Classes as Functional Interface Implementations
651Basic Lambda Conversion: Removing Boilerplate
652Lambda Conversions with Parameters and Return Values
653When Lambda Conversion Is Not Possible
654Method References as Further Simplification
655this and super Semantics: Key Differences
656Variable Capture: Effectively Final Requirement
657Practical Migration: Collections and Event Handlers

← Java

Lesson 650 of 2,870·15. Nested and Inner ClassesPro lesson

Anonymous Classes as Functional Interface Implementations

Understanding when anonymous classes implement functional interfaces and can be replaced by lambdas.

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