online library mini project

 package com.company;

class Library {
    String[] books;
    int noOfBooks;
    public Library() {
        this.books = new String[1000];
        noOfBooks = 0;
    }
    public void addBook(String x) {
        this.books[noOfBooks] = x;
        noOfBooks++;
        System.out.println(x + " has been added!!");
    }
    public void showBooks() {
        System.out.println("Available books are: ");
        for (String e : this.books) {
            if (e == null) {
                continue;
            }
            System.out.println("* " + e);
        }
    }
    public void issuedBook(String x) {
        for (int i = 0; i < this.books.length; i++) {
            if (this.books[i]. equals(x) ) {
                this.books[i] = null;
                System.out.println(x + " book has been issued!");
//                continue;
            }
        }
        System.out.println("this book not exist");
    }

    public static class CWH_51_Exercise4 {
        public static void main(String[] args) {
            Library lib1 = new Library();
            lib1.addBook("Rich dad poor dad");
            lib1.addBook("R.D sharma");
            lib1.addBook("Material science");
            lib1.addBook("Half girlfriend");
            lib1.showBooks();
            lib1.issuedBook("Material science");
            lib1.showBooks();
        }
    }
}