Mary Class

gistfile1.java

class Mary {
  // This is a variable storing the current age
  int age = 0;
  int weight = 100;

  // This is a method to increment the current age variable by the amount passed in
  function increaseAge(int amount) {
    age = age + amount;
  }

  // This is a function to eat food. Capital Food is the class (type) name and food is the instance. 
  // this is probably getting a little ahead of where you are in the book so let me know if you have questions.
  function eatFood(Food food) {
    // This is something I just made up. So the food class would define a property called calories. I'm 
    // saying that calories * 1000 is 1 pound.  Just made up.  
    weight = weight + food.calories * 1000;
  }
}

// Then to use this class:

Mary mary = Mary.new();
// mary.weight => would equal 100
// mary.age => would equal 0

mary.increaseAge(5);
// mary.age => would equal 5

mary.eatFood(food); // food would be defined somewhere else
// mary.weight => would equal 100 + food.calories * 1000