public class Person { // this is the class declaration

    // these are instance variables. any method in this class can access and change them
    public String name; // public means that anything can access this variable
    private int age; // private means that only methods in this class can access this variable

    // this is a default constructor. if no parameters are provided, this constructor is called
    public Person() {
        name = "Jimmy";
        age = 10;
    }

    // if this object is created with the following parameters, this constructor is called
    public Person(String newName, int newAge) {
        name = newName;
        age = newAge;
    }

    public void PrintHello() { // this is a method of the class
        System.out.println("Hello, " + name + "!");
    }

    public int HighFive() { // this is another method. it returns the number 5
        return 5;
    }

    public int GetAge() {
        return age; // even though age is private, we can share its value by using a method
    }

    // let's add two numbers and return the sum
    public int AddNumbers(int a, int b) {
        int c = a + b;
        return c;
    }
}