Added code from exercises and demos.

Author: abrahammenendez

End Of Chapter Workspaces/Chapter 02/PerformanceExample1/src/Main.java

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+import java.util.Date;
+
+public class Main {
+
+	public static void main(String[] args) throws InterruptedException {
+		Thread.sleep(20000);
+		System.out.println("starting the work...");
+		PrimeNumbers primeNumbers = new PrimeNumbers();
+		Integer max = Integer.parseInt(args[0]);
+		primeNumbers.generateNumbers(max);
+	}
+
+}

End Of Chapter Workspaces/Chapter 02/PerformanceExample1/src/PrimeNumbers.java

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+import java.util.ArrayList;
+import java.util.List;
+
+public class PrimeNumbers {
+
+	private List<Integer> primes;
+	
+	private Boolean isPrime(Integer testNumber) {
+		for (int i = 2; i < testNumber; i++) {
+			if (testNumber % i == 0) return false;
+		}
+		return true;
+	}
+	
+	private Integer getNextPrimeAbove(Integer previous) {
+		Integer testNumber = previous + 1;
+		while (!isPrime(testNumber)) {
+			testNumber++;
+		}
+		return testNumber;
+	}
+	
+	public void generateNumbers (Integer max) {
+		primes = new ArrayList<Integer>();
+		primes.add(2);
+
+		Integer next = 2;
+		while (primes.size() <= max) {
+			next = getNextPrimeAbove(next);
+			primes.add(next);
+		}
+		//System.out.println(primes);
+	}
+
+}

End Of Chapter Workspaces/Chapter 03/PerformanceExample1/src/Main.java

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+import java.util.Date;
+
+public class Main {
+
+	public static void main(String[] args) throws InterruptedException {
+		Date start = new Date();
+		PrimeNumbers primeNumbers = new PrimeNumbers();
+		Integer max = Integer.parseInt(args[0]);
+		primeNumbers.generateNumbers(max);
+		Date end = new Date();
+		System.out.println("Elapsed time was " + (end.getTime() - start.getTime()) +" ms.");
+	}
+
+}

End Of Chapter Workspaces/Chapter 03/PerformanceExample1/src/PrimeNumbers.java

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+import java.util.ArrayList;
+import java.util.List;
+
+public class PrimeNumbers {
+
+	private List<Integer> primes;
+	
+	private Boolean isPrime(Integer testNumber) {
+		for (int i = 2; i < testNumber; i++) {
+			if (testNumber % i == 0) return false;
+		}
+		return true;
+	}
+	
+	private Integer getNextPrimeAbove(Integer previous) {
+		Integer testNumber = previous + 1;
+		while (!isPrime(testNumber)) {
+			testNumber++;
+		}
+		return testNumber;
+	}
+	
+	public void generateNumbers (Integer max) {
+		primes = new ArrayList<Integer>();
+		primes.add(2);
+
+		Integer next = 2;
+		while (primes.size() <= max) {
+			next = getNextPrimeAbove(next);
+			primes.add(next);
+		}
+		//System.out.println(primes);
+	}
+
+}

End Of Chapter Workspaces/Chapter 05/ExploringMemory/src/Main.java

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+
+public class Main {
+
+	
+	public static void calculate(int calcValue) {
+		calcValue = calcValue * 100;
+	}
+	
+	public static void main(String[] args) {
+		int localValue = 5;
+		calculate(localValue);
+		System.out.println(localValue);
+
+	}
+
+}

End Of Chapter Workspaces/Chapter 07/EscapingReferences/src/com/virtualpairprogrammers/escapingreferences/customers/CustomerRecords.java

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+package com.virtualpairprogrammers.escapingreferences.customers;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+import com.virtualpairprogrammers.escapingreferences.customers.customerImplementation.Customer;
+
+public class CustomerRecords implements Iterable<Customer> {
+	private Map<String, Customer> records;
+	
+	public CustomerRecords() {
+		this.records = new HashMap<String, Customer>();
+	}
+	
+	public void addCustomer(String name) {
+		this.records.put(name, new Customer(name));
+	}
+		
+	public Map<String, Customer> getCustomers() {
+		return Map.copyOf(records);
+		//return Collections.unmodifiableMap(records);
+	}
+
+	@Override
+	public Iterator<Customer> iterator() {
+		return records.values().iterator();
+	}
+	
+	public ReadonlyCustomer find(String name) {
+		return new Customer(records.get(name));
+	}
+}

End Of Chapter Workspaces/Chapter 07/EscapingReferences/src/com/virtualpairprogrammers/escapingreferences/customers/ReadonlyCustomer.java

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+package com.virtualpairprogrammers.escapingreferences.customers;
+
+public interface ReadonlyCustomer {
+
+	String getName();
+
+	String toString();
+
+}

End Of Chapter Workspaces/Chapter 07/EscapingReferences/src/com/virtualpairprogrammers/escapingreferences/customers/customerImplementation/Customer.java

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+package com.virtualpairprogrammers.escapingreferences.customers.customerImplementation;
+import com.virtualpairprogrammers.escapingreferences.customers.ReadonlyCustomer;
+
+public class Customer implements ReadonlyCustomer {
+	private String name;
+
+	@Override
+	public String getName() {
+		return name;
+	}
+	
+	public void setName(String name) {
+		this.name = name;
+	}
+
+	public Customer(String name) {
+		this.name = name;
+	}
+	
+	public Customer(ReadonlyCustomer c) {
+		this.name = c.getName();
+	}
+
+		@Override
+		public String toString() {
+		return name;
+	}
+	
+}

End Of Chapter Workspaces/Chapter 07/EscapingReferences/src/module-info.java

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+
+module EscapingReferences {
+	exports com.virtualpairprogrammers.escapingreferences.customers;
+}

End Of Chapter Workspaces/Chapter 07/EscapingReferencesClient/src/main/Main.java

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+package main;
+
+import com.virtualpairprogrammers.escapingreferences.customers.CustomerRecords;
+import com.virtualpairprogrammers.escapingreferences.customers.ReadonlyCustomer;
+
+public class Main {
+
+	public static void main(String[] args) {
+		CustomerRecords records = new CustomerRecords();
+		
+		records.addCustomer("John");
+		records.addCustomer("Simon");
+		
+		for (ReadonlyCustomer c : records) {
+			System.out.println(c);
+		}
+		
+		//Customer c = (Customer) records.find("John");
+				
+
+	}
+}

End Of Chapter Workspaces/Chapter 07/EscapingReferencesClient/src/module-info.java

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+
+module EscapingReferencesClient {
+	requires EscapingReferences;
+}

End Of Chapter Workspaces/Chapter 08/BookCatalog/src/main/Book.java

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+package main;
+
+public class Book implements ReadonlyBook {
+	private int id;
+	private String title;
+	private String author;
+	private Price price;
+	
+	@Override
+	public int getId() {
+		return id;
+	}
+
+	@Override
+	public String getTitle() {
+		return title;
+	}
+
+	@Override
+	public String getAuthor() {
+		return author;
+	}
+
+	public Book(int id, String title, String author, Double price) {
+		this.id = id;
+		this.title = title;
+		this.author = author;
+		this.price = new Price(price);
+	}
+
+	@Override
+	public String toString() {
+		return title + " by " + author;
+	}
+
+	@Override
+	public Price getPrice() {
+		return this.price;
+	}
+	
+	public void setPrice(Double price) {
+		this.price = new Price(price);
+	}
+	
+}

End Of Chapter Workspaces/Chapter 08/BookCatalog/src/main/BookCollection.java

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+package main;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Predicate;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class BookCollection {
+	
+	private List<Book> books;
+	
+	public BookCollection() {
+		 books = new ArrayList<Book>();
+		 books.add(new Book(1,"Don Quixote","Miguel De Cervantes",3.99));
+		 books.add(new Book(2,"Pilgrim's Progress","John Bunyan",4.45));
+		 books.add(new Book(3,"Robinson Crusoe","Daniel Defoe",3.99));
+		 books.add(new Book(4,"Gulliver's Travels","Jonathan Swift",7.60));
+		 books.add(new Book(5,"Tom Jones","Henry Fielding",9.99));
+		 books.add(new Book(6,"Clarissa","Samuel Richardson",4.45));
+		 books.add(new Book(7,"Dangerous Liaisons","Pierre Choderlos De Laclos",11.50));
+		 books.add(new Book(8,"Emma","Jane Austen",3.99));
+		 books.add(new Book(9,"Frankenstein","Mary Shelley",7.60));
+		 books.add(new Book(10,"The Count of Monte Christo","Alexandre Dumas",3.99));
+	}
+	
+	public ReadonlyBook findBookByName(String title) {
+		for (Book book : books) {
+			if (book.getTitle().equals(title)) {
+				return book;
+			}
+		}
+		return null;
+	}
+	
+	public void printAllBooks() {
+		for (ReadonlyBook book : books) {
+			System.out.println(book.getTitle() + ": " + book.getPrice());
+		}
+	}
+
+}
+	

End Of Chapter Workspaces/Chapter 08/BookCatalog/src/main/Main.java

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+package main;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Predicate;
+
+
+public class Main {
+
+	public static void main(String[] args) {
+
+		System.out.println("---START OF PROBLEM 1---");
+		//Print out the current exchange rates
+		System.out.println("The current exchange rates are USD 1 = ");
+		Price price = new Price(1.0);
+		price.getRates().forEach( (k,v) -> System.out.println(k + " " + v));
+		
+		//PROBLEM 1 - can we change one of the rates?
+		//price.getRates().put("USD", 2d);		
+		System.out.println("The current exchange rates are USD 1 = ");
+		price.getRates().forEach( (k,v) -> System.out.println(k + " " + v));
+		
+		System.out.println("---END OF PROBLEM 1---");
+		
+		System.out.println("---START OF PROBLEM 2---");
+		
+		//Get all the books printed out
+		BookCollection bc = new BookCollection();
+		bc.printAllBooks();
+		
+		//PROBLEM 2 - can we change a book?
+		ReadonlyBook emma = bc.findBookByName("Emma");
+		//emma.setPrice(999d);
+		bc.printAllBooks();
+		
+		System.out.println("---END OF PROBLEM 2---");
+		
+		System.out.println("---START OF PROBLEM 3---");
+		//Print out the price of the book Tom Jones
+		ReadonlyBook book = bc.findBookByName("Tom Jones");
+		System.out.println("Tom Jones costs USD " + book.getPrice());
+		System.out.println("Tom Jones costs EUR " + book.getPrice().convert("EUR"));
+		System.out.println("Tom Jones costs GBP " + book.getPrice().convert("GBP"));
+		System.out.println("---END OF PROBLEM 3---");
+		
+		
+	}
+}