import java.io.*;

public class Runnable_Class2{
		//static int i = 0;

	public static void main(String args[]){
		int count = 0;
		int count_t = 0;
		Data dato = new Data();
		System.out.println("Cuenta Actual (MAIN_THREAD): " + dato.getData());
		RunnableThread rt = new RunnableThread(dato);
		Thread t = new Thread(rt);
		t.start();
		while(count < 100){
 				dato.incrementar();				
				System.out.println("Cuenta Actual (MAIN_THREAD): " + dato.getData());
			count++;
		}

	}
}

class RunnableThread implements Runnable{
	public RunnableThread(Data d_){
		d=d_;
	}
	public void run(){
		int count_t = 0;
		while(count_t < 100){ 	
			  synchronized(Data.class) {
				d.decrementar();
			  }
				System.out.println("Cuenta Actual (SECOND_THREAD): " + d.getData());
			count_t++;
		}

	}
	private Data d;
}

class Data {
	public synchronized void incrementar(){
		i++;
	}
	public void decrementar(){
		i--;
	}
    public synchronized int getData(){
		return i;
	}

	private int i=0;
}