Method TrimBook and its test

trimmer.java

/*
This was a method used to resize the array of books in library before switching to collections. Saving here in case in the future a need
to resize array in languages without dynamic collections
*/

	/*Method to resize array after removing elements*/
	void trimBooks() {
		int count = 0,shift=0;
		for (int i=0; i < this.books.length; i++) {
			if(this.books[i]==null) { //Finding how many elements were removed, saving in count
				count++;
			}
		}
		Book[] new_book = new Book[this.books.length-count];
		
		for (int i=0; i < this.books.length-count;i++) { // Filling new array
		while(this.books[i+shift]==null) { //Counting number of blanks from location in cycle
				shift++;
			}
			new_book[i]=this.books[i+shift];
	}
	
		this.books = new_book;
	}


// The test for the above method in Library
@Test
	public void testTrimBooks() {
		Book[] b = new Book[4];
		b[0]=new Book(1,"Sanremo",new Author(3,"Pippo","Baudo"));
		b[1]=new Book(4,"Sawnremo",new Author(3,"Pippo","Baudo"));
		b[2]=null;
		b[3]=new Book(5,"Sanremeeeo",new Author(5,"Pippow","Baudow"));
		Library lib = new Library();
		lib.addBooks(b);
		lib.trimBooks();
		b = new Book[3];
		b[0]=new Book(1,"Sanremo",new Author(3,"Pippo","Baudo"));
		b[1]=new Book(4,"Sawnremo",new Author(3,"Pippo","Baudo"));
	  b[2]=new Book(5,"Sanremeeeo",new Author(5,"Pippow","Baudow"));
    assertTrue(Arrays.equals(b, lib.getBooks()));

	}