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What J2ObjC is

J2ObjC is an open-source command-line tool from Google that translatesJava source code to Objective-C for the iOS (iPhone/iPad) platform. This toolenables Java source to be part of an iOS application's build, as no editingof the generated files is necessary. The goal is to write an app's non-UIcode (such as application logic and data models) in Java, which is thenshared by web apps (usingJ2CL), Android apps,and iOS apps.

Get Started

J2ObjC supports most Java language and runtime features required byclient-side application developers, including exceptions, inner andanonymous classes, generic types, threads and reflection. JUnit testtranslation and execution is also supported.

What J2ObjC isn't

J2ObjC does not provide any sort of platform-independent UI toolkit, nor arethere any plans to do so in the future. We believe that iOS UI code needs tobe written in Objective-C, Objective-C++ or Swift using Apple's iOS SDK.

J2ObjC cannot convert Android binary applications. Developers must have sourcecode for their Android app, which they either own or are licensed to use.

Requirements

  • Mac workstation or laptop
  • Mac OS X 13.5 or higher
  • Xcode 15 or higher
  • JDK 11 or higher

Except as otherwise noted, the content of this page is licensed under theCreative Commons Attribution 4.0 License, and code samples are licensed under theApache 2.0 License. For details, see theGoogle Developers Site Policies. Java is a registered trademark of Oracle and/or its affiliates.

Last updated 2024-08-16 UTC.