Here is a simplified class for representing books owned by library: class Book {

Question

 Here is a simplified class for representing books owned by library:     

 class Book {   String title, author; // title, author   String callNumber; // cal! number, such as V'QA567.23 P23"   } 

 Suppose that a library owns 27,532 books and that information about all the books has already been stored in an array     

 Bookt[]books=new bookst[27532];     

 a) A science book is one whose call number begins with the letter Write a method that will count the number of science books owned by the library and return that number.   HINT there is a string method called charAt().     

 b) Write another method that wilt print out the answer to this question: Does the library own more books by "Isaac Asimov" or more books by 'William Shakespeare"? Write a code segment that will find out. Print the answer with System.out.printin().    

Explanation / Answer

//below code demonstrates the methods you want
//copy the complete answer and save it as Library.java and run it to check the output.

//i have highlighted the methods that you have asked
class Book {
String title, author;
String callNumber;
Book(String title,String author,String callNumber)
{
this.author=author;
this.title=title;
this.callNumber=callNumber;
}
String author()
{
return author;
}
String title()
{
return title;
}
String callNumber()
{
return callNumber;
}
}

public class Library {
public static void main(String args[])
{ //i am initalising some books to check the methods
Book[] books=new Book[5];
books[0]=new Book("hgsgsd","Isaac Asimov","CX67356");
books[1]=new Book("hgsgsd","Isaac Asimov","DX67356");
books[2]=new Book("hgsgsd","William Shakespeare","67356XX");
books[3]=new Book("hgsgsd","Isaac Asimov","Xu67356");
books[4]=new Book("hgsgsd","William Shakespeare","FX67356");
System.out.println("Science books are:"+numScience(books));
System.out.println(moreBooks(books,"Isaac Asimov","William Shakespeare"));
  
}
static int numScience(Book[] books)
{
int count=0; //counting the books whose call number starts withletter.
for (Book book : books) {
if (Character.isLetter(book.callNumber().charAt(0))) {
count++;
}
}
return count;
}
static String moreBooks(Book[] books,String author1,String author2)
{
int au1=0,au2=0; //count variables for authors
for (Book book : books) {
if (book.author().equalsIgnoreCase(author1)) { //compare author 1 and 2 names
au1++;
}
else if(book.author().equalsIgnoreCase(author2))
{
au2++;
}
}
if(au1>au2) //check which author have more books
return "Author havinng more books is"+author1;
else if(au2>au1)
return "Author havinng more books is"+author2;
else if(au1==0&&au2==0)
return "Both have no books"; //if both have no books
else
return "Both havingsame number of books"; //if both have same number of books
}
  
}

/*
example output
Science books are:4
Author having more books isIsaac Asimov
*/

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