Gente utilizando interface ISync

import java.util.Random;

public class Gente implements Runnable {

    private ISync sync;

    Gente(ISync sync) {
    this.sync = sync;
    }

    public void run() {
    Random r = new Random();

    while (true) {
        sync.entrar();
        System.out.println("Hilo dentro jardin: " +
                   Thread.currentThread());
        try {
        Thread.sleep(Math.abs(r.nextInt()) % 5000 + 1);
        sync.salir();
        Thread.sleep(Math.abs(r.nextInt()) % 5000 + 1);
        System.out.println("Estoy fuera del jardin: " +
                   Thread.currentThread());
        }
        catch (InterruptedException ie) { }
    }

    }
}