What is the use of Java libraries?

Flutter uses a flexible system that allows you to call platform-specific APIs in a language that works directly with those APIs: Kotlin or Java on Android.

There is no way you can use any java-related code or application in iOS . You have to work on a native port. iOS doesn’t have a jvm.

The library provides an abstract interface to tasks that would normally depend heavily on the hardware and operating system, such as network access and file access . Some underlying platforms may not support all of the features a Java application expects.