initial checkin

chapter10/Animal.java

@@ -0,0 +1,8 @@
+package chapter10;
+
+public class Animal {
+
+    public void makeSound(){
+        System.out.println("unknown animal sound");
+    }
+}

chapter10/Cat.java

@@ -0,0 +1,14 @@
+package chapter10;
+
+public class Cat extends Animal {
+
+    @Override
+    public void makeSound(){
+        System.out.println("meow");
+    }
+
+    public void scratch(){
+        System.out.println("I am a cat. I scratch things.");
+    }
+
+}

chapter10/Dog.java

@@ -0,0 +1,13 @@
+package chapter10;
+
+public class Dog extends Animal {
+
+    @Override
+    public void makeSound(){
+        System.out.println("woof");
+    }
+
+    public void fetch(){
+        System.out.println("fetch is fun!");
+    }
+}

chapter10/Zoo.java

@@ -0,0 +1,32 @@
+package chapter10;
+
+public class Zoo {
+
+    public static void main(String[] args){
+
+        Dog rocky = new Dog();
+        rocky.fetch();
+        rocky.makeSound();
+        feed(rocky);
+
+        Animal sasha = new Dog();
+        sasha.makeSound();
+        feed(sasha);
+
+        sasha = new Cat();
+        sasha.makeSound();
+        ((Cat) sasha).scratch();
+        feed(sasha);
+    }
+
+    public static void feed(Animal animal){
+
+        if(animal instanceof Dog){
+            System.out.println("here's your dog food");
+        }
+
+        else if(animal instanceof Cat){
+            System.out.println("here's your cat food");
+        }
+    }
+}

chapter11/Book.java

@@ -0,0 +1,65 @@
+package chapter11;
+
+public class Book implements Product {
+
+    private double price;
+    private String name;
+    private String color;
+    private String author;
+    private int pages;
+    private String isbn;
+
+    @Override
+    public double getPrice() {
+        return price;
+    }
+
+    @Override
+    public void setPrice(double price) {
+        this.price = price;
+    }
+
+    @Override
+    public String getName() {
+        return name;
+    }
+
+    @Override
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    @Override
+    public String getColor() {
+        return color;
+    }
+
+    @Override
+    public void setColor(String color) {
+        this.color = color;
+    }
+
+    public String getAuthor() {
+        return author;
+    }
+
+    public void setAuthor(String author) {
+        this.author = author;
+    }
+
+    public int getPages() {
+        return pages;
+    }
+
+    public void setPages(int pages) {
+        this.pages = pages;
+    }
+
+    public String getIsbn() {
+        return isbn;
+    }
+
+    public void setIsbn(String isbn) {
+        this.isbn = isbn;
+    }
+}

chapter11/Customer.java

@@ -0,0 +1,10 @@
+package chapter11;
+
+public class Customer {
+
+    public static void main(String[] args){
+
+        Product book = new Book();
+        book.setPrice(9.99);
+    }
+}

chapter11/Product.java

@@ -0,0 +1,17 @@
+package chapter11;
+
+public interface Product {
+
+    double getPrice();
+    void setPrice(double price);
+
+    String getName();
+    void setName(String name);
+
+    String getColor();
+    void setColor(String color);
+
+    default String getBarcode(){
+        return "no barcode";
+    }
+}

chapter11/Rectangle.java

@@ -0,0 +1,33 @@
+package chapter11;
+
+public class Rectangle extends Shape {
+
+    private double length;
+    private double width;
+
+    public double getLength() {
+        return length;
+    }
+
+    public void setLength(double length) {
+        this.length = length;
+    }
+
+    public double getWidth() {
+        return width;
+    }
+
+    public void setWidth(double width) {
+        this.width = width;
+    }
+
+    public Rectangle(double length, double width){
+        setLength(length);
+        setWidth(width);
+    }
+
+    @Override
+    double calculateArea() {
+        return length * width;
+    }
+}

chapter11/Shape.java

@@ -0,0 +1,10 @@
+package chapter11;
+
+public abstract class Shape {
+
+    abstract double calculateArea();
+
+    public void print(){
+        System.out.println("I am a shape");
+    }
+}

chapter11/ShapeTester.java

@@ -0,0 +1,11 @@
+package chapter11;
+
+public class ShapeTester {
+
+    public static void main(String[] args){
+
+        Shape rectangle = new Rectangle(5, 7);
+        rectangle.print();
+        System.out.println(rectangle.calculateArea());
+    }
+}

chapter12/CollectionsDemo.java

@@ -0,0 +1,96 @@
+package chapter12;
+
+import java.util.*;
+
+public class CollectionsDemo {
+
+    public static void main(String[] args){
+        setDemo();
+        listDemo();
+        queueDemo();
+        mapDemo();
+    }
+
+    public static void setDemo(){
+        Set fruit = new HashSet();
+        fruit.add("apple");
+        fruit.add("lemon");
+        fruit.add("banana");
+        fruit.add("orange");
+        fruit.add("lemon");
+
+        System.out.println(fruit.size()); //4
+        System.out.println(fruit); //[banana, orange, apple, lemon]
+    }
+
+    public static void listDemo(){
+        List fruit = new ArrayList();
+        fruit.add("apple");
+        fruit.add("lemon");
+        fruit.add("banana");
+        fruit.add("orange");
+        fruit.add("lemon");
+
+        System.out.println(fruit.get(2)); //banana
+        System.out.println(fruit.size()); //5
+        System.out.println(fruit); //[apple, lemon, banana, orange, lemon]
+    }
+
+    public static void queueDemo(){
+        Queue fruit = new LinkedList();
+        fruit.add("apple");
+        fruit.add("lemon");
+        fruit.add("banana");
+        fruit.add("orange");
+        fruit.add("lemon");
+
+        System.out.println(fruit.size()); //5
+        System.out.println(fruit); //[apple, lemon, banana, orange, lemon]
+
+        fruit.remove();
+        System.out.println(fruit);//[lemon, banana, orange, lemon]
+
+        System.out.println(fruit.peek());//lemon
+    }
+
+    public static void mapDemo(){
+        Map fruitCalories = new HashMap();
+        fruitCalories.put("apple", 95);
+        fruitCalories.put("lemon", 20);
+        fruitCalories.put("banana", 105);
+        fruitCalories.put("orange", 45);
+        fruitCalories.put("lemon", 17);
+
+        System.out.println(fruitCalories.size()); //4
+        System.out.println(fruitCalories); //{banana=105, orange=45, apple=95, lemon=17}
+
+        System.out.println(fruitCalories.get("lemon"));//17
+
+        System.out.println(fruitCalories.entrySet());//[banana=105, orange=45, apple=95, lemon=17]
+
+        fruitCalories.remove("orange");
+        System.out.println(fruitCalories);//{banana=105, apple=95, lemon=17}
+    }
+
+    public void print(Collection<String> collection){
+        var i = collection.iterator();
+        while(i.hasNext()){
+            System.out.println(i.next());
+        }
+
+        for(String item : collection){
+            System.out.println(item);
+        }
+
+        collection.forEach(System.out::println);
+    }
+
+    public void print(Map<String, Integer> map){
+        for(var entry : map.entrySet()){
+            System.out.println(entry.getValue());
+        }
+
+        map.forEach(
+                (k,v)->System.out.println("Fruit: " + k + ", Calories: " + v));
+    }
+}

chapter13/ExceptionHandling.java

@@ -0,0 +1,50 @@
+package chapter13;
+
+
+import java.io.File;
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+public class ExceptionHandling {
+
+    public static void main(String args[]){
+        createNewFile();
+        numbersExceptionHandling();
+    }
+
+    public static void createNewFile(){
+        File file = new File("resources/nonexistent.txt");
+        try{
+            file.createNewFile();
+        }catch (Exception e){
+            System.out.println("Directory does not exist.");
+            e.printStackTrace();
+        }
+    }
+
+    public static void createNewFileRethrow() throws IOException{
+        File file = new File("resources/nonexistent.txt");
+        file.createNewFile();
+    }
+
+    public static void numbersExceptionHandling(){
+        File file = new File("resources/numbers.txt");
+        Scanner fileReader = null;
+        try{
+            fileReader = new Scanner(file);
+
+            while(fileReader.hasNext()){
+                double num = fileReader.nextDouble();
+                System.out.println(num);
+            }
+
+
+        }catch(FileNotFoundException | InputMismatchException e){
+            e.printStackTrace();
+        }finally{
+            fileReader.close();
+        }
+    }
+}

chapter2/GrossPayCalculator.java

@@ -0,0 +1,26 @@
+package chapter2;
+
+import java.util.Scanner;
+
+public class GrossPayCalculator {
+
+    public static void main(String arg[]){
+
+        //1. Get the number of hours worked
+        System.out.println("Enter the number of hours the employee worked.");
+        Scanner scanner = new Scanner(System.in);
+        int hours = scanner.nextInt();
+
+        //2. Get the hourly pay rate
+        System.out.println("Enter the employee's pay rate.");
+        double rate = scanner.nextDouble();
+        scanner.close();
+
+        //3. Multiply hours and pay rate
+        double grossPay = hours * rate;
+
+        //4. Display result
+        System.out.println("The employee's gross pay is $" + grossPay);
+    }
+
+}