Java Inner Classes, Lambdas & Closures

These flashcards cover key concepts related to Java inner classes, lambda expressions, and closures.

Static Nested Class

A nested class defined with the static modifier, which can only access static members of the outer class.

Non-Static Inner Class

A nested class that is associated with an instance of its enclosing class and can access both static and non-static members.

Anonymous Inner Class

A class without a name, used for one-time use, typically implementing an interface or extending a class.

Lambda Expression

A concise way to represent an anonymous function; allows you to create instances of functional interfaces.

Captured Variables

Variables from the enclosing scope that are used inside a lambda expression.

Effectively Final

A variable that is not modified after its initialization, which allows it to be used in a lambda expression.

Shadowing

A situation where a local variable or inner class field hides a variable from the outer class.

Invoke-Dynamic

A bytecode optimization used by lambda expressions that avoids creating a new object at runtime.

Functional Interface

An interface with exactly one abstract method, which can be implemented by a lambda expression.

Method Reference

A shorthand notation of a lambda expression to call a method directly, e.g., System.out::println.