public void initial(){

		Integer initialTankCount = Integer.parseInt(PropertyManager.getInstance().getProperty("initialTankCount"));
		 w1 = new Wall (100,300,20,150,this);
		 w2 = new Wall (300,100,300,20,this);
		 myTank = new Tank(700,500,true,Direction.STOP,this);
		 missiles  = new ArrayList<Missile>();
		 explosions = new ArrayList<Explosion>();
		 enemyTanks = new ArrayList<Tank>();
		 offScreenImage = null;
		 for(int i = 0 ; i < initialTankCount; i++){
				enemyTanks.add(new Tank(50 + 40 *(i + 1), 50,false,Direction.D, this));
		}
	}