public class Widget {
 private int inStock;
 public Widget() {
 inStock = 10;
 }
 public void addInventory(int amt) {
 inStock = inStock + amt;
 }
 public static void main(String [] args){
 Widget blueWidget = new Widget();
 Widget greenWidget = new Widget();
 blueWidget.addInventory(15);
 greenWidget.addInventory(5);
 }
}