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J2 object It is a command line tool developed by Google that can convert Java code to Objective-C for iOS/iPadOS projects. Using this tool, Java code can become part of the application build, allowing Web, iOS, and Android applications to share non-UI elements without any changes.

If you are developing a multi-platform application and prefer to use Java for non-UI elements, you can use this tool to convert the code and then use it in an Objective-C iOS application without further modification. Even Google uses it for some projects, and the documentation is extensive.

Supports most Java language and runtime features, allowing developers to use exceptions, generic types, inner and anonymous classes, threads, and reflection. Supports JUnit test translation and execution.

When it comes to the UI itself, J2ObjC doesn’t provide any tools to help you design it. The user interface is designed to be written in Objective-C, Objective-C++, or Swift, so you still need to be familiar with these languages ​​to complete the project. But it might help if you already have a Java backend, or if you just prefer to use that language for certain elements.