https://github.com/jruby/jruby/jruby-core: JRuby is the effort to recreate the Ruby (https://www.ruby-lang.org) interpreter in Java. (JRuby)
  • headius
  • enebo
  • wmeissner
  • BanzaiMan
  • mkristian 
package org.jruby.ir;

public class Tuple<T1, T2> {
    final public T1 a;
    final public T2 b;

    public Tuple(T1 a, T2 b) {
        this.a = a;
        this.b = b;
    }
}