antsetr.blogg.se - Override method java reflection

#OVERRIDE METHOD JAVA REFLECTION CODE#

In the case of the Java FFI, the compilerJava pod is the compiler plugin for importing the Java type system into Fantom.įantom code using the Java FFI results in a normal pod file compiled down into fcode. The Fantom compiler itself has no knowledge of Java libraries, rather it supports FFI plugins based on pods being prefixed with "". For example the Java package javax.swing has the Fantom pod name of javax.swing. Java packages are mapped to Fantom pods by prefixing the string "". Java APIs are imported into the Fantom type system via the normal using statement with a special syntax for pod names. The Java FFI does not use any special Fantom syntax. Int x = new int x := IntArray(5) How it Works Import using java.util::Map$Entry as Entry Quick reference for mapping Java code to Fantom code: Java Fantom

The following table summarizes the mapping of Java types to Fantom types: Java Type Fantom Typeįoo Foo // sys::List parameterized with Fooīoolean fanx.interop::BooleanArrayįoo // unsupported for both primitivies and Objects

Attempting to override a Java overloaded method this means you cannot subclass or extend from a type with abstract overloaded methodsįeatures which are not supported result in a compile time error.

Subclassing a Java class more than one level deep.

Dynamic invoke support against Java classesįeatures which are not yet available in Java FFI:.

Fantom reflection support for Java members.

Direct mappings for Java one-dimensional primitive arrays.

Implicit coercion between one-dimensional Object arrays and sys::List.

Implicit coercion between Java primitives and sys::Int, sys::Float.

Extend Java classes (only one level of inheritance allowed right now).

Construct Java classes using the Fantom constructor syntax.

Call overloaded Java methods from Fantom.

Interop with any Java API except those which use multi-dimensional arrays.

However, there is a level of impedance mismatch between the two type systems. The Java FFI is basically a mapping of the Java type system into the Fantom type system:įantom was designed to run on the JVM, so mapping between the two worlds is fairly straightfoward with a high level of interoperability. The Java Foreign Function Interface (or Java FFI) is a feature which allows Fantom code to easily utilize normal Java libraries.