Week 6 Discussion Wednesday, 11/6/19 Reminders PSA4 Submission due - - PowerPoint PPT Presentation

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Week 6 Discussion Wednesday, 11/6/19 Reminders PSA4 Submission due - - PowerPoint PPT Presentation

Sep 24, 2023 361 likes •942 views

Week 6 Discussion Wednesday, 11/6/19 Reminders PSA4 Submission due Tuesday, November 12 11:59pm For students that are missing discussion participation and you clicked in, we will handle it all at once at the end of the quarter. Extra credit:

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SLIDE 1

Week 6 Discussion

Wednesday, 11/6/19

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SLIDE 2

Reminders

PSA4 Submission due Tuesday, November 12 11:59pm For students that are missing discussion participation and you clicked in, we will handle it all at once at the end of the quarter. Extra credit: Beating the raccoon, but fix your code first!

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  • Inheritance Review
  • Overview of the PA
  • Game mechanics
  • Critters you have to make
  • Inheritance Practice

Today’s agenda

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PSA4 Overview

  • Critter
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Overriding

  • eat() getColor()

getAttack() Critter

  • Critter

Critter

  • Critter
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Critter World

  • X: 0, Y: 0
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Meet the Methods

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Movement

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Movement

  • Critter

getMove

  • Critter

North South West East Center

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Eating

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Eating

  • Critter
  • Critter
  • Critter
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Fighting

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SLIDE 13

Fighting

  • Critter

ROAR POUNCE SCRATCH

  • ROAR

SCRATCH SCRATCH POUNCE POUNCE ROAR ○

  • FORFEIT

FORFEIT

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Mating

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SLIDE 15
  • Critter
  • Mating
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  • Critter

Critter Critter

Scoring

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Meet the Critters

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  • Critter.java
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  • FORFEIT

Starfish extends Critter

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  • WEST
  • eat()

Critter

  • ROAR

FORFEIT ○

Turtle extends Critter

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  • ○
  • eat

○

  • POUNCE

Feline extends Critter

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  • Overrides

Feline getAttack()

  • eat

○

Lion extends Feline

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  • Lion
  • Leopard

○

  • confidence
  • Leopard extends Feline
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  • verride getColor()

generateAttack()

  • Override generateAttack()
  • getAttack()

Ocelot extends Leopard

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  • goalX

goalY ○ Elephant

  • getMove()

○ Elephant Elephant

  • Elephant

getMove()

Elephant extends Critter

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  • Critter

Critter Critter

  • buffBehavior()

Critter

  • debuff()

Critter

  • buffBehavior() & debuff()
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  • Lion
  • Lion's Buff Effect
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SLIDE 28
  • Leopard
  • Leopard's Buff Effect
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SLIDE 29
  • Leopard
  • Ocelot's Buff Effect
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  • …

Starfish's Buff Effect

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  • void teleport(Point currentLocation,

Critter[][] arena) ○ Starfish ■ ○ Starfish null

Starfish's Teleportation

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More Inheritance Practice Problems

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SLIDE 33

public class Motorcycle extends Vehicle { @Override public void startEngine() { System.out.println("ZOOM"); } } public static void main(String[] args) { Vehicle v = new Vehicle(); v.startEngine(); Vehicle c = new Car(); c.startEngine(); Motorcycle m = new Motorcycle(); m.startEngine(); } // What is the output? public class Vehicle { String name; int year; public void startEngine() { System.out.println("Engine"); } public String getName() { return name; } } public class Car extends Vehicle { @Override public void startEngine() { System.out.println("VROOM"); } }

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public class Motorcycle extends Vehicle { @Override public void startEngine() { System.out.println("ZOOM"); } } public static void main(String[] args) { Vehicle v = new Vehicle(); v.startEngine(); Vehicle c = new Car(); c.startEngine(); Motorcycle m = new Motorcycle(); m.startEngine(); } // What is the output? Engine VROOM ZOOM public class Vehicle { String name; int year; public void startEngine() { System.out.println("Engine"); } public String getName() { return name; } } public class Car extends Vehicle { @Override public void startEngine() { System.out.println("VROOM"); } }

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Inheritance Practice 2

public class Vehicle { public void startEngine() { System.out.println("Starting Engine"); } } public class Car extends Vehicle { public void startEngine(int x) { System.out.println("Car " + x); } } public static void main(String[] args) { Vehicle c = new Car(); c.startEngine(); }

What gets printed?

A: Starting Engine B: Car 0 C: compiler error

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Inheritance Practice 2

This gets printed.

A: Starting Engine B: Car 0 C: compiler error public class Vehicle { public void startEngine() { System.out.println("Starting Engine"); } } public class Car extends Vehicle { public void startEngine(int x) { System.out.println("Car " + x); } } public static void main(String[] args) { Vehicle c = new Car(); c.startEngine(); }

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Inheritance Practice 3

public class Vehicle { public void startEngine() { System.out.println("Starting Engine"); } } public class Car extends Vehicle { public void startEngine(int x) { System.out.println("Car " + x); } } public static void main(String[] args) { Vehicle c = new Car(); c.startEngine(1); }

What gets printed?

A: Starting Engine B: Car 1 C: compiler error

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Inheritance Practice 3

This gets printed.

A: Starting Engine B: Car 1 C: compiler error public class Vehicle { public void startEngine() { System.out.println("Starting Engine"); } } public class Car extends Vehicle { public void startEngine(int x) { System.out.println("Car " + x); } } public static void main(String[] args) { Vehicle c = new Car(); c.startEngine(1); }

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Inheritance Practice 4

public class Vehicle { public void startEngine() { System.out.println("Starting Engine"); } } public class Car extends Vehicle { public void startEngine(int x) { System.out.println("Car " + x); } } public static void main(String[] args) { Car c = new Car(); c.startEngine(1); }

What gets printed?

A: Starting Engine B: Car 1 C: compiler error

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Inheritance Practice 4

This gets printed.

A: Starting Engine B: Car 1 C: compiler error public class Vehicle { public void startEngine() { System.out.println("Starting Engine"); } } public class Car extends Vehicle { public void startEngine(int x) { System.out.println("Car " + x); } } public static void main(String[] args) { Car c = new Car(); c.startEngine(1); }

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// Inheritance Constructor Example 1

public class Dog { public String name; public Dog() { name = "Dog"; } } public class Husky extends Dog { public Husky() { name = "Husky"; } } // in main() Dog sydney = new Husky(); System.out.println( sydney.name);

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// Inheritance Constructor Example 1

public class Dog { public String name; public Dog() { name = "Dog"; } } public class Husky extends Dog { public Husky() { name = "Husky"; } } // in main() Dog sydney = new Husky(); System.out.println( sydney.name); Answer: Husky

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// Inheritance Constructor Example 2

public class Dog { public String name; public Dog() { name = "Dog"; } } public class Husky extends Dog { public Husky() { // do nothing } } // in main Dog sydney = new Husky(); Husky cindy = new Husky(); System.out.println( sydney.name + " " + cindy.name);

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// Inheritance Constructor Example 2

public class Dog { public String name; public Dog() { name = "Dog"; } } public class Husky extends Dog { public Husky() { // do nothing call super() by default } } // in main Dog sydney = new Husky(); Husky cindy = new Husky(); System.out.println( sydney.name + " " + cindy.name); Answer: Dog Dog

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// Inheritance Constructor Example 3

public class Dog { public String name; public Dog() { name = "Dog"; } public Dog(String name) { this.name = name; } } // in main Dog sydney = new Husky(); Husky cindy = new Husky("husky"); System.out.println( sydney.name + " " + cindy.name); public class Husky extends Dog { public Husky() { // do nothing } public Husky(String name) { // do nothing } }

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// Inheritance Constructor Example 3

public class Dog { public String name; public Dog() { name = "Dog"; } public Dog(String name) { this.name = name; } } // in main Dog sydney = new Husky(); Husky cindy = new Husky("husky"); System.out.println( sydney.name + " " + cindy.name); Answer: Dog Dog public class Husky extends Dog { public Husky() { // do nothing } public Husky(String name) { // do nothing } }

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// Inheritance Constructor Example 4

public class Dog { public String name; public Dog() { name = "Dog"; } public Dog(String name) { this.name = name; } } // in main Dog sydney = new Husky(); Husky cindy = new Husky("Husky"); System.out.println( sydney.name + " " + cindy.name); public class Husky extends Dog { public Husky() { // do nothing } public Husky(String name) { super(name); } }

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SLIDE 48

// Inheritance Constructor Example 4

public class Dog { public String name; public Dog() { name = "Dog"; } public Dog(String name) { this.name = name; } } // in main Dog sydney = new Husky(); Husky cindy = new Husky("Husky"); System.out.println( sydney.name + " " + cindy.name); Answer: Dog Husky public class Husky extends Dog { public Husky() { // do nothing } public Husky(String name) { super(name); // super() not called } }

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Inheritance Practice 5

public class Vehicle { public Vehicle(int x) { System.out.println("NEW VEHICLE " + x); } } public class Plane extends Vehicle { public Plane() { super(1); System.out.println("NEW PLANE"); } } public static void main(String[] args) { Vehicle v = new Vehicle(2); Plane c = new Plane(); }

What gets printed?

A: NEW VEHICLE 2 NEW PLANE B: NEW VEHICLE 2 NEW VEHICLE 1 NEW PLANE C: compiler error

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SLIDE 50

This gets printed.

A: NEW VEHICLE 2 NEW PLANE B: NEW VEHICLE 2 NEW VEHICLE 1 NEW PLANE C: compiler error

Inheritance Practice 5

public class Vehicle { public Vehicle(int x) { System.out.println("NEW VEHICLE " + x); } } public class Plane extends Vehicle { public Plane() { super(1); System.out.println("NEW PLANE"); } } public static void main(String[] args) { Vehicle v = new Vehicle(2); Plane c = new Plane(); }

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Inheritance Practice 6

public class Vehicle { public Vehicle(int x) { System.out.println("NEW VEHICLE " + x); } } public class Plane extends Vehicle { public Plane() { super(1); System.out.println("NEW PLANE"); } } public static void main(String[] args) { Vehicle v = new Vehicle(2); Plane c = new Plane(3); }

What gets printed?

A: NEW VEHICLE 2 NEW VEHICLE 1 NEW PLANE B: NEW VEHICLE 2 NEW VEHICLE 3 NEW PLANE C: compiler error

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This gets printed.

A: NEW VEHICLE 2 NEW VEHICLE 1 NEW PLANE B: NEW VEHICLE 2 NEW VEHICLE 3 NEW PLANE C: compiler error

  • We don’t inherit the constructor method-

Inheritance Practice 6

public class Vehicle { public Vehicle(int x) { System.out.println("NEW VEHICLE " + x); } } public class Plane extends Vehicle { public Plane() { super(1); System.out.println("NEW PLANE"); } } public static void main(String[] args) { Vehicle v = new Vehicle(2); Plane c = new Plane(3); }

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Inheritance Practice 7

public class Vehicle { public Vehicle(int x) { System.out.println("NEW VEHICLE " + x); } } public class Plane extends Vehicle { public Plane() { System.out.println("NEW PLANE"); } } public static void main(String[] args) { Vehicle v = new Vehicle(2); Plane c = new Plane(); }

What gets printed?

A: NEW VEHICLE 2 NEW PLANE B: NEW VEHICLE 2 NEW VEHICLE 0 NEW PLANE C: compiler error

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This gets printed.

A: NEW VEHICLE 2 NEW PLANE B: NEW VEHICLE 2 NEW VEHICLE 0 NEW PLANE C: compiler error

Inheritance Practice 7

public class Vehicle { public Vehicle(int x) { System.out.println("NEW VEHICLE " + x); } } public class Plane extends Vehicle { public Plane() { super(); // why? System.out.println("NEW PLANE"); } } public static void main(String[] args) { Vehicle v = new Vehicle(2); Plane c = new Plane(); }

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public class Vehicle { public Vehicle() { System.out.println("NEW VEHICLE"); } } public class Plane extends Vehicle { public Plane() { this(1); System.out.println("YAY"); } public Plane(int x) { System.out.println("NEW PLANE"); } } public static void main(String[] args) { Vehicle v = new Vehicle(); Plane c = new Plane(); }

What gets printed?

A: NEW VEHICLE NEW PLANE YAY B: NEW VEHICLE NEW VEHICLE NEW PLANE YAY C: NEW VEHICLE NEW VEHICLE NEW VEHICLE NEW PLANE YAY

Inheritance Practice 8

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This gets printed.

A: NEW VEHICLE NEW PLANE YAY B: NEW VEHICLE NEW VEHICLE NEW PLANE YAY C: NEW VEHICLE NEW VEHICLE NEW VEHICLE NEW PLANE YAY

public class Vehicle { public Vehicle() { System.out.println("NEW VEHICLE"); } } public class Plane extends Vehicle { public Plane() { this(1); System.out.println("YAY"); } public Plane(int x) { System.out.println("NEW PLANE"); } } public static void main(String[] args) { Vehicle v = new Vehicle(); Plane c = new Plane(); }

Inheritance Practice 8