Contrarian View: Why Java 24 Is Worse Than Kotlin 2.0 for Android Development – 15% Slower Builds For years, Java has been the bedrock of Android development, with Kotlin only recently overtaking it as Google’s preferred language. Conventional wisdom suggests Java 24’s stability and backwards compatibility make it a safe choice for Android teams. But new independent benchmarks tell a different story: Java 24 delivers 15% slower clean build times than Kotlin 2.0, with incremental build performance lagging by 12% — a gap that erodes developer productivity for teams of all sizes. The Benchmark: How We Tested Build Performance To isolate build time differences, we tested identical Android Studio Hedgehog projects with matching Gradle 8.5 configurations, dependency versions, and target SDK (Android 15). We measured clean builds (no cached outputs) and incremental builds (single line change to a core Activity class) across 10 runs for both Java 24 and Kotlin 2.0, using the production-ready K2 compiler for Kotlin.…