Java 11 support: Start using var

[iluwatar]

This task is part of the Java 11 transition plan https://github.com/iluwatar/java-design-patterns/wiki/16.-Java-11-Transition

Start using local-variable type inference (var). It is a nice example of syntactic sugar that helps reduce boilerplate code (see https://www.infoq.com/articles/upgrading-java-8-to-12/ and https://winterbe.com/posts/2018/09/24/java-11-tutorial/)

It's a huge task to do this for all the patterns at once so it is possible to create pull requests for individual patterns. This way we can complete the task gradually. The following checklist tracks which patterns have already been refactored.

[x] abstract-document
[x] abstract-factory
[x] acyclic-visitor
[x] adapter
[x] aggregator-microservices
[x] ambassador
[x] api-gateway
[x] async-method-invocation
[x] balking
[x] bridge
[x] builder
[x] business-delegate
[x] bytecode
[x] caching
[x] callback
[x] chain
[x] circuit-breaker
[x] collection-pipeline
[x] command
[x] commander
[x] composite
[x] converter
[x] cqrs
[x] dao
[x] data-bus
[x] data-locality
[x] data-mapper
[x] data-transfer-object
[x] decorator
[x] delegation
[x] dependency-injection
[x] dirty-flag
[x] double-checked-locking
[x] double-dispatch
[x] eip-aggregator
[x] eip-message-channel
[x] eip-publish-subscribe
[x] eip-splitter
[x] eip-wire-tap
[x] event-aggregator
[x] event-asynchronous
[x] event-driven-architecture
[x] event-queue
[x] event-sourcing
[x] execute-around
[x] extension-objects
[x] facade
[x] factory-kit
[x] factory-method
[x] feature-toggle
[x] fluentinterface
[x] flux
[x] flyweight
[x] front-controller
[x] guarded-suspension
[x] half-sync-half-async
[x] hexagonal
[x] intercepting-filter
[x] interpreter
[x] iterator
[x] layers
[x] lazy-loading
[x] leader-election
[x] marker
[x] master-worker-pattern
[x] mediator
[x] memento
[x] model-view-controller
[x] model-view-presenter
[x] module
[x] monad
[x] monostate
[x] multiton
[x] mute-idiom
[x] mutex
[x] naked-objects
[x] null-object
[x] object-mother
[x] object-pool
[x] observer
[x] page-object
[x] partial-response
[x] pipeline
[x] poison-pill
[x] priority-queue
[x] private-class-data
[x] producer-consumer
[x] promise
[x] property
[x] prototype
[x] proxy
[x] queue-load-leveling
[x] reactor
[x] reader-writer-lock
[x] repository
[x] resource-acquisition-is-initialization
[x] retry
[x] role-object
[x] semaphore
[x] servant
[x] serverless
[x] service-layer
[x] service-locator
[x] singleton
[x] spatial-partition
[x] specification
[x] state
[x] step-builder
[x] strategy
[x] template-method
[x] thread-pool
[x] throttling
[x] tls
[x] tolerant-reader
[x] trampoline
[x] twin
[x] typeobjectpattern
[x] unit-of-work
[x] value-object
[x] visitor

[Anurag870]

I am working on this

[iluwatar]

Ok @Anurag870

[zbeach]

I'd also like to work on this!

[iluwatar]

@Anurag870 could you state which patterns will you be working on? @zbeach can then look at some others.

[Anurag870]

@zbeach I will keep updating the list here:

abstract-document
abstract-factory
acyclic-visitor
adapter
aggregator-microservices

[gvsharma]

I would like to work on this?

[iluwatar]

Ok @gvsharma, just declare what patterns you will be working on so the work won't conflict with @Anurag870 and @zbeach

[gvsharma]

I will work on below patterns
[ ] serverless
[ ] service-layer
[ ] service-locator
[ ] singleton
[ ] state
[ ] step-builder
[ ] strategy
[ ] template-method
[ ] thread-pool
[ ] throttling

[gvsharma]

I will work on below patterns
[ ] serverless
[ ] service-layer
[ ] service-locator
[ ] singleton
[ ] state
[ ] step-builder
[ ] strategy
[ ] template-method
[ ] thread-pool
[ ] throttling

Done with changes. Thank you

[anuragagarwal561994]

@iluwatar picked up remaining b-c in #1081

[anuragagarwal561994]

@iluwatar picked up starting with a in #1084
@iluwatar picked up from t-v in #1085

[anuragagarwal561994]

@iluwatar picked all c-e in #1111 and #1112

[anuragagarwal561994]

@iluwatar picked all f in #1115

[anuragagarwal561994]

@iluwatar picked remaining g,h,i in #1116

[anuragagarwal561994]

@iluwatar picked all s in #1120

[anuragagarwal561994]

@iluwatar picked all q-r in #1121

[anuragagarwal561994]

@iluwatar picked all p in #1122

[npczwh]

@iluwatar, updated the below patterns in #1190:
layers
lazy-loading
leader-election

[anuragagarwal561994]

@iluwatar picked all m in #1220

[npczwh]

@iluwatar, updated the below patterns in #1222:
object-mother
object-pool
observer

[venkatrs-ch197]

Hi,

I'd like to work on [ ] module pattern.
Can I proceed with this?

[venkatrs-ch197]

Hi @iluwatar,

Can you please look into my pull request #1238 and let me know if any changes required.

Thanks,
Venkat

[anuragagarwal561994]

@iluwatar picked remaining in #1479