BookAndLibrary

public class Book {

	int numberSold;
	private String name;
	private double price;

	public Book(String n, String p, int c) {

	}

	//write the static method mostExpensive in a driver class
	//which accepts an array of Books and return the price of
	//the most expensive book.
	public static double mostExpensive(Book[] array) {
		double x = array[0].getPrice();
		for (int i = 1; i < array.length; i++) {
			if (array[i].getPrice() > x) {
				x = array[i].getPrice();
			}
		}
		return x;
	}

	//implement the static method bestSeller in the Book class,
	//which accepts an array of Books and return the best selling Book
	public static Book bestSeller(Book[] books) {

		Book bestSeller = books[0];
		for(int i = 1; i < books.length; i++){
			if(bestSeller.numberSold < books[i].numberSold)
				bestSeller = books[i];
		}
		return bestSeller;
	}

	public double getPrice() {
		return price;
	}

	public void setPrice(double newPrice) {
		price = newPrice;
	}

	public String getName() {
		return this.name;
	}

	public void setName(String newName) {
		name = newName;
	}

	/*
	*
	*  Element k of the returned array
	//contains the single letter at position k of str. For example,
	//getSingleLetters ("cat") returns the array {"c", "a", "t"}.
	*
	* */

}


public class Library{

	private String libraryName;
	private Book [] list;
	public Library (String name, Book [] books){
		//complete this constructor



	}
	//Write the instance method BestSeller including its method
	//header, which returns the name of the bestselling book.
	//Return the first of the best selling books if there's more than one.


	public Book bestSeller(){
		return Book.bestSeller(list);
	}

	//Write the instance method doublePrice, which doubles the
	//price of each book in list.

	public void doublePrice(){
		for(int i = 0; i < list.length; i++){
			Book book = list[i];
			book.setPrice(book.getPrice() * 2);
		}
	}

	//Write the static method longestWord which accepts a string
	//array and returns the length of the longest word in the array.
	//String [] strings

	//return int;
	public static int longestWord(String [] strings){

		int longest = 0;

		for(int i = 0; i < strings.length; i++){
			String word = strings[i];

			if(word.length() > longest){
				longest = word.length();
			}
		}

		return longest;
	}


	//Write the static method gotSingleLetters which accepts a String str
	//and returns a string array. Each of these strings
	//consists of a single letter from str.

	//return string[]
	public static String []  getSingleLetters(String str){

		String[] allLetters = new String[str.length()];//capacity; number of things that can fit

		for(int i = 0; i < str.length(); i++){

			allLetters[i] = str.substring(i, i + 1);
		}

		/*
		String s = "cat";
		s.substring(1, 2);
		*/

		return allLetters;
	}

}