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+++ categories = ["kotlin", "dev", "android", "teachingkotlin"] date = 2019-12-04T04:35:45Z description = "Part 3 of #TeachingKotlin covers some subtle differences between Kotlin and Java that might affect your codebases as you start migrating to or writing new code in Kotlin." draft = true slug = "teachingkotlin-part-3--caveats-coming-from-java" tags = ["android", "teachingkotlin", "kotlin"] title = "#TeachingKotlin Part 3 - Caveats coming from Java"
+++ When you start migrating your Java code to Kotlin, you will encounter multiple subtle changes that might catch you off guard. I'll document some of these gotchas that I and other people I follow have found and written about.
Splitting strings
Java's java.lang.String#split method takes a String as it's first argument and creates a Regex out of it before attempting to split. Kotlin, however, has two variants of this method. One takes a String and uses it as a plaintext delimiter, and the other takes a Regex behaving like the Java method we mentioned earlier. Code that was directly converted from Java to Kotlin will fail to accommodate this difference, so be on the lookout.
#ProTip: When converting your Java code to #Kotlin, remember to double check if you were relying on java.lang.String's implicit Regex conversion, because Kotlin does not do it.pic.twitter.com/u5DnDRJdx6
— Harsh Shandilya (@MSF_Jarvis) December 4, 2019