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Java Streams API

Eager vs Lazy Stream Operations

In the Streams API, operations that return a stream are lazy, and operations that return a non-stream result (or return no result, such as forEach()) are eager.

Java Local Classes

Local classes are classes that are defined in a block, which is a group of zero or more statements between balanced braces. Typically local classes are defined in the body of a method.

Local class can be defined inside any block (see Expressions, Statements, and Blocks for more information).