when you have only one choice of your parent it's hard to be forced to chose one due to contract rather than for other reasons. Especially in languages which did not support multiple-inheritance. The code sharing was a big plus and inheritance is nice for some things but the forced contract at times could be constraining. In traditional OO, without interfaces, an abstract class gave you your inheritance chain (thereby defining some of your public contract) but sometimes also gave you some of your default implementations (code sharing). This meant that, at first, interfaces were not used as a design mechanism but as a generic IPC (inter-process communication) and RPC (remote procedure call).Īs things matured interfaces started getting used as design tools (beyond their other function). As interfaces first came into the industry they were only used for cross-application (read that as mainly cross-language) communication and formed the contracts of those divisions. Some of your confusion comes from not understanding the history.įirstly, abstract classes pre-date interfaces so at first that was all you had. You are correct that "essentially" you would have the same thing. Learn Programming Java Help ← Seek help here Learn Java Java Conference Videos Java TIL Java Examples JavaFX Oracle JVM LanguagesĬlojure Scala Groovy ColdFusion Kotlin Want to practice your coding?ĭailyProgrammer ProgrammingPrompts ProgramBattles List of useful Frameworks / Libraries / Software If you have any questions, please do not hesitate to ask them! Related Sub-reddits: ![]() Some vendors will be supporting releases for longer than six months. If you would like to download Java for free, you can get OpenJDK builds from the following vendors, among others:Īdoptium (formerly AdoptOpenJDK) RedHat Azul Amazon SAP Liberica JDK Dragonwell JDK GraalVM (High performance JIT) Oracle Microsoft With the introduction of the new release cadence, many have asked where they should download Java, and if it is still free. Join us on IRC #reddit-java Where should I download Java? No surveys, no job offers! Such content will be removed without warning.No programming help questions here! These should be posted in /r/javahelp.Do not post tutorials here! These should go in /r/learnjava. ![]() Upvote good content, downvote spam, don't pollute the discussion with things that should be settled in the vote count. Please seek help with Java programming in /r/Javahelp! Subreddit rules! These have separate subreddits - see below. ![]() Submit Link Submit Text Seek Programming Help News, Technical discussions, research papers and assorted things of interest related to the Java programming language NO programming help, NO learning Java related questions, NO installing or downloading Java questions, NO JVM languages - Exclusively Java
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