Class LambdaVarExamples

java.lang.Object

net.jrodolfo.java_evolution.java11.LambdaVarExamples

public class LambdaVarExamples
extends Object

Demonstrates var in lambda parameters, introduced in Java 11.

Java 10 introduced var for local variables. Lambda parameters could already have inferred types, but there was no syntax for annotating those inferred parameters.

Java 11 allowed var in lambda parameter lists. The main benefit is not saving characters; it makes inferred lambda parameters consistent with local variables and allows annotations on them.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static @interface	LambdaVarExamples.ExampleParameter	Marker annotation used only to demonstrate annotating an inferred lambda parameter.

Constructor Summary

Constructors

Constructor	Description
LambdaVarExamples()

Method Summary

Modifier and Type	Method	Description
List<Integer>	nameLengths(List<String> names)	Uses an annotation on a lambda parameter whose type is inferred with var.
List<String>	normalizeNames(List<String> names)	Uses var for an inferred lambda parameter.

Methods inherited from class Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

LambdaVarExamples

public LambdaVarExamples()

Method Details

normalizeNames

public List<String> normalizeNames(List<String> names)

Uses var for an inferred lambda parameter.

Parameters:

names - the names to normalize

Returns:

trimmed lowercase names

nameLengths

public List<Integer> nameLengths(List<String> names)

Uses an annotation on a lambda parameter whose type is inferred with var.

Parameters:

names - the names to inspect

Returns:

the name lengths