Paulien van Alst - Upgrade Time: Choose Java 11 or the "other" one… Kotlin - Codemotion Amsterdam 2019
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The document outlines a presentation by Paulien Van Alst on upgrading to Java 11 or Kotlin, emphasizing key features such as enhanced switch statements, stream operations, and the advantages of Kotlin like regular updates and readability. It includes migration plans and coding examples related to board game data filtering and price calculation. The talk aims to guide attendees on making a successful transition while providing practical coding insights.
Paulien van Alst - Upgrade Time: Choose Java 11 or the "other" one… Kotlin - Codemotion Amsterdam 2019
- 1. Upgrade Time! Choose Java 11 or the other one… Kotlin! Paulien van Alst Amsterdam | April 2-3, 2019
- 3. Highlights Java 9/10/11 switch statements var something = “Something” JShell Convenience methods for collections Release cadence
- 4. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add);
- 5. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 6. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 7. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 8. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 9. My story with Kotlin boardGameRepository.findAllByCategory(ADVENTURE).stream() .filter(game -> game.getMinimalNumberOfPlayers() > 2) .filter(game -> game.getMinimalAge() > 10) .map(BoardGameEntity::getPrice) .reduce(BigDecimal.ZERO, BigDecimal::add); boardGameRepository.findAllByCategory(ADVENTURE) .moreThanTwoPlayers() .olderThanTenToPlay() .meanPrice()
- 10. Reasons to switch to Kotlin Regular updates Interoperability Multiplatform Readability Less boilerplate Safe programming
- 11. What to keep in mind Interoperability Idioms Magic problem solver
- 12. Warning! DO this at home or In a POC
- 13. Let’s start! Rates 6 8 Games above … 8 9 9,5
- 14. Let’s start! Spring boot 2 In memory database UT’s and IT’s
- 15. Migration Plan 1. Set-up dependencies 2. Migrate PoJo’s 3. Rewrite unit tests 4. Core logic 5. Configuration 6. Test DSL
- 17. Migration Plan 1. Set-up dependencies 2. Migrate PoJo’s 3. Rewrite unit tests 4. Core logic 5. Configuration 6. Test DSL
- 19. Thank you! Rate this talk!