Java expert please help me the program below? Here is the requirement.

====Book.java====

public class Book { private String title; private String author; private String isbn; public Book(String t, String a, String i) { title = t; author = a; isbn = i; } @Override public int hashCode() { final int prime = 31; int result = 1; result = prime * result + ((author == null) ? 0 : author.hashCode()); result = prime * result + ((isbn == null) ? 0 : isbn.hashCode()); result = prime * result + ((title == null) ? 0 : title.hashCode()); return result; } @Override public boolean equals(Object obj) { if (this == obj) return true; if (obj == null) return false; if (getClass() != obj.getClass()) return false; Book other = (Book) obj; if (author == null) { if (other.author != null) return false; } else if (!author.equals(other.author)) return false; if (isbn == null) { if (other.isbn != null) return false; } else if (!isbn.equals(other.isbn)) return false; if (title == null) { if (other.title != null) return false; } else if (!title.equals(other.title)) return false; return true; } @Override public String toString() { return "Book [title=" + title + ", author=" + author + ", isbn=" + isbn + " hashcode=" + hashCode() + "]"; } }

====HashPlay.java====

import java.util.HashSet; public class HashPlay { public static void main(String[] args) { Book b1 = new Book("C. S. Lewis", "Out of the Silent Planet", "1234"); Book b2 = new Book("CS Lewis", "Out Of The Silent Planet", "1234"); System.out.println("b1: " + b1); System.out.println("b2: " + b2); HashSet hm = new HashSet(); hm.add(b1); System.out.println("removal of book: " + hm.remove(b2)); System.out.println(hm); } }

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