Inheritance Lesson Hacks

• Group Information
• Notes of Key Concepts
• Hacks

Group Information

• Group 7
• Members: Shraddha Kadaba and Bria Gilliam

Notes of Key Concepts

• Each class can extend from it's base class
• When a class extends from its base class, it inherits the methods and other attributes
• Protected: an access modifier so that the attribute isn't affected by access modifier that isn't affected by outside modifiers
• If the attributes of the subclass are exactly the same as the attributes of the superclass, then we can just use the constructor of the superclass.
• An additional attribute that's added to the subclass class does not have to be added to the superclass if it does not apply to it
• Overriding methods allows the subclass to provide specific implementation of a method
  • Has to be already provided by the super-class
• If a method in a subclass has the same name, same parameters or signature, and same return type as a method in its super-class, then the method in the subclass will override the method in the super-class.
• Uses of the super keyword
  • Use constructors in the superclass
  • Use the methods in the superclass in the child class
• You can use a inheritance hierarchy to organize references
• Polymorphism: You can do one action many ways
  • Runtime Polymorphism: method overriding
  • Compile Time Polymorphism: also using method overrloading
• Object class is the superclass of all other classes in Java
• toString Method: Prints out the attributes of an object and converts a string object to string
• equals Method: Compares two strings and returns a boolean value of true if equal

Hacks

public class Candy {
    protected double candyCalories;
    protected double candyRating;
    protected double candySize; 

    public Candy(double candyCalories, double candySize, double candyRating){
    this.candyCalories = candyCalories;
    this.candyRating = candyRating;
    this.candySize = candySize; 
    }
    public void healthWarning() {
        System.out.println("Candy is not healthy. Consume in moderation!");
    }
    public static void main(String[] args){
        Candy can = new Candy(100, 20, 9.4);
        can.healthWarning();
        
    }
}

Candy.main(null);

Candy is not healthy. Consume in moderation!

public class Starbursts extends Candy{
    protected String candyColor; 
    public Starbursts(double candyCalories, double candySize, double candyRating, String candyColor){
        super(candyCalories, candySize, candyRating);
        this.candyColor = candyColor;
    }
    @Override
    public void healthWarning() {
        System.out.println("Starbursts are not good for you!!!");
    }
    public void type(String type1){
        System.out.println("Your candy is " + type1 + ".");
    }
    public void type(String type1, String type2) {
        System.out.println("Your candy is " + type1 + " and " + type2 + ".");
    }

    public static void main(String[] args){
        Starbursts star = new Starbursts(20, 0.5, 6.5, "Red");
        star.healthWarning();
        star.type("sweet");
        star.type("sweet", "chewy");
    }
}
Starbursts.main(null);

Starbursts are not good for you!!!
Your candy is sweet.
Your candy is sweet and chewy.

public class Smarties extends Candy{
    protected String candyColor;
    public Smarties(double candyCalories, double candySize, double candyRating, String candyColor){
        super(candyCalories, candySize, candyRating);
        this.candyColor = candyColor;
    }

    @Override
    public void healthWarning() {
        System.out.println("Smarties are not good for you!!!");
    }
    public static void main(String[] args){
        Smarties smart = new Smarties(20, 0.5, 6.5, "Red");
        smart.healthWarning();
    }
}
Smarties.main(null);

Smarties are not good for you!!!