Object Oriented Programming (OOP) #

This lab introduces the concept of OOP in Java.

[0] Setup #

Clone the Repository #

💻 select [Projects] > [Get from VCS] > [Repository URL] #

Be sure to change yourgithubusername to your actual GitHub username.

https://github.com/isf-dp-cs/lab_oop_yourgithubusername

Switch to Java 21 #

💻 Select [File] > [Project Structure]

💻 From the SDK: dropdown, select Java 21

[1] Killing the Cat #

First, take a look at the Cat class:

public class Cat {
	//attributes
	private String name; 
	private int lives = 9;

	//methods
	public Cat(String name) {
		this.name = name;
	}

	public void speak() {
		System.out.println("meow!!");
	}

	// main method
	public static void main(String[] args) {
		Cat myCat = new Cat("Ollie"); // creates a new cat object
		myCat.speak(); //calls the cat object's method
	}
}

You can see that there are two attributes (name and lives) and three methods (the constructor, speak and main).

The main method already creates a Cat object and gets it to seak

💻 Add a method that lets the cat introduce itself. It should print a greeting out to the console, including the cat’s name.

💻 Test your new method by calling it in the main method.

You can see that the cat starts out with 9 lives.
💻 Add a loop to the main method that can kill the cat.

[2] Superhumans #

Here is an overview of the Superhuman class.

• The - symbol means that the attribute/method is private and can be used only inside the class.

• The + symbol means the attribute/method is public and can be used outside of this class.

  Superhuman
  –Attributes–
  - name: String
  - age: int
  –Methods–
  + Superhuman(String name, int age)
  + getName(): returns a String
  + setName(String name): returns void
  + getAge(): returns an int
  + setAge(int age): returns void
  + printInfo(): returns void —this method should print out all the attributes

Test the Superhuman Class #

💻 In the main() method that creates two superhuman objects and prints out their info using the printInfo method.

💻 Add more steps to main() to test out each of the settters. Call printInfo() each time, to check that it’s working correctly

Add new features #

💻 Add in a new attribute, alias. Make sure to add the correstponding setters/getters.

💻 Test your additions in the main method.

[3] Deliverables #

⚡✨

Fill in the Google Form #

✏️ It can be found here

Push to Github #

💻 Select Commit from the menu on the left.

Select all your updated files. Be sure to include a descriptive commit message.

💻 Click Commit and Push

💻 Click Push