package Hilos;
public class Hilos {
    public void iniciar() {
        Ping x1= new Ping("ping", 1);
        Thread th1= new Thread(x1);

        Ping x2= new Ping("ping",2);
        Thread th2= new Thread(x2);

        Ping x3= new Ping("ping",3);
        Thread th3= new Thread(x3);

        Ping x4= new Ping("ping",4);
        Thread th4= new Thread(x4);

        Ping x5= new Ping("ping",5);
        Thread th5= new Thread(x5);

        Ping x6= new Ping("pong",6);
        Thread th6= new Thread(x6);

        Ping x7= new Ping("pong",7);
        Thread th7= new Thread(x7);

        Ping x8= new Ping("pong",8);
        Thread th8= new Thread(x8);

        Ping x9= new Ping("pong",9);
        Thread th9= new Thread(x9);

        Ping x10= new Ping("pong",10);
        Thread th10= new Thread(x10);

        th1.start();
        th2.start();
        th3.start();
        th4.start();
        th5.start();
        th6.start();
        th7.start();
        th8.start();
        th9.start();
        th10.start();

    }

    public static void main(String[] args) {
        Hilos h = new Hilos();
        h.iniciar();
    }
}

class Ping implements Runnable {
    static boolean bandera = true;
    String c;
    int cual;

    public Ping(String c, int cual) {
        this.c = c;
        this.cual = cual;
    }

    public synchronized void imprimir1(){
        if(c=="ping"&&bandera==true){
            System.out.println(c+cual);
            bandera=false;
        }
        if(c.equals("pong")&&bandera==false){
            System.out.println("t"+c+cual);
            bandera=true;
        }
    }

    @Override
    public void run() {
        while(true) {
            try {
                Thread.sleep(500);
                imprimir1();
            } catch (InterruptedException ex) {
            }
        }
    }
}