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JRubyAndJavaCodeExamples
Charles Oliver Nutter edited this page Feb 16, 2017
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Below are some code examples showing how to call JRuby from Java and how to call Java from JRuby.
See also: Calling Java from JRuby
require "java"
java_import "java.util.TreeSet"
java_import "com.example.CallMe"
java_import "com.example.ISpeaker"
puts "Hello from ruby"
set = TreeSet.new
set.add "foo"
set.add "Bar"
set.add "baz"
set.each { |v| puts "value: #{v}" }
cm = CallMe.new
cm.hello
$globalCM.hello
class CallJava
include ISpeaker
def initialize
super
@count = 0
end
def say(msg)
puts "Ruby saying #{msg}"
end
def addOne(from)
# m.synchronize {
@count += 1
puts "Now got #@count from #{from}"
# }
end
endpackage com.example;
public interface ISpeaker {
public void say(String msg);
public void addOne(String from);
}package com.example;
public class CallMe {
String mName;
public CallMe() {
this("Default");
}
public CallMe(String name) {
mName = name;
}
public void hello() {
System.out.println("Hello from "+mName);
}
public static void main(String []args) {
System.out.println("Called main");
}
}See the following pages for updated Java embedding documentation:
RedBridge - The RedBridge API is the recommended Java API to use when embedding JRuby into a Java application or writing Java code to drive JRuby.
Embedding with JSR-223 - JSR-223, also known as the the `javax.script` API, is a standard Java API for driving embedded JVM languages. It is not as direct as RedBridge but it is standard across all JVM languages that support it.