public class oopIntroLec {

public static void main(String[] args) {

// ======================== slide 3 (classes and objects)

//

// Person rick = new Person();

// rick.firstName = "Rick";

// rick.lastName = "Sanchez";

// System.out.println(rick.firstName);

// doing p1 == p2 will check ids, not contents

// accessing a variable that hasn't been defined will return a null

// default value for number types is 0

// booleans default to false

// empty char gives empty array

//

// Person fred = new Person();

// fred.firstName = "Fred";

// fred.lastName = "Smith";

// System.out.println(fred.firstName);

// System.out.println(fred.lastName);

// -- Dog Example --

//

// d1.age = 3;

// d1.breed = "corgi";

// d1.canBreed = false;

// d1.name = "Tater";

// ======================== slide 4 (object fields)

// Person rick = new Person();

// rick.firstName = "Rick";

// rick.lastName = "Sanchez";

// System.out.println(rick.sayHello());

// -- Dog Method Example --

// Dog d1 = new Dog();

// d1.age = 3;

// d1.breed = "corgi";

// d1.canBreed = false;

// d1.name = "Tater";

//

// d1.callForDog("Tater");

// ======================== slide 5 (class fields)

// System.out.println(Arithmetic.PI);

// System.out.println(Arithmetic.add(5, 5));

// System.out.println(Arithmetic.multiply(5, 5));

// -- DogHelper Example --

Dog dog = new Dog();

dog.name = "Sparky";

dog.age = 3;

dog.callForDog("Sparky");

System.out.println(DogHelper.NUMBER_OF_DOG_BREEDS);

System.out.println(DogHelper.humanToDogYears(dog.age));

// ======================== slide 7 (class vs. object fields)

// Person theBestDrummerAlive = new Person();

// theBestDrummerAlive.name = "Neil Peart";

// Person.worldPopulation += 1; // accessing a static property

//

// System.out.println(Person.worldPopulation);

//

// // this also works, but is usually not a good idea

// System.out.println(theBestDrummerAlive.worldPopulation); // 7500000001

// System.out.println(theBestDrummerAlive.name);

// ======================== slide 8 (constructors)

// Student jane = new Student("Jane Doe", "Zion");

// System.out.print(jane.name + " - ");

// System.out.println(jane.cohort); // prints "Jane Doe - Zion"

// Student john = new Student("John Doe");

// System.out.println(john.name + " - ");

// System.out.println(john.cohort); // prints "John Doe - Unassigned"

// ======================== slide 9 (this keyword)

// Student jane = new Student("Jane Doe", "Zion");

// System.out.print(jane.name + " - ");

// System.out.println(jane.cohort); // prints "Jane Doe - Zion"

// Student john = new Student("John Doe");

// System.out.print(john.name + " - ");

// System.out.println(john.cohort); // prints "John Doe - Unassigned"

// ======================== slide 10 (visibility)

// Student student = new Student("John Doe", 82.4);

// System.out.println(student.name) // "John Doe"

// // DON'T DO THIS - can't access private properties outside the class

// System.out.println(student.grade);

// System.out.println(student.shareGrade()); // Do this instead

}

}