Java interop example

This example uses the experimental JNI bridge to call StringBuilder, ArrayList, HashMap and Math.

Run it

Install a JDK and use a MatchBox CLI with JNI support. From this directory:

matchbox main.bxs

The script prints a greeting, collection values and results from Java's math functions.

Calling Java

import java:java.util.ArrayList as List;

items = new List();
items.add( "hello" );
println( items.get( 0 ) );

math = createObject( "java", "java.lang.Math" );
println( math.sqrt( 144 ) );

Java collection indexes start at 0. Use createObject(...).init() when explicitly constructing an instance through a class reference.

JNI is a native host integration, not a browser feature. A standalone executable also needs JNI support in its runner; ordinary runner stubs do not include it. See Java interop for the integration overview.