java exercise4

 //implement a library using java class library

//methods: issuebook,returnbook,showavailablebooks
//properties:to store available books,store issued books
//exercise 4


package com.company;

class library {
    String[] books;
    int no_of_books;

    library() {
        this.books = new String[100];
        this.no_of_books = 0;
    }


    void addbook(String book) {
        this.books[no_of_books] = book;
        no_of_books++;
        System.out.println(book + ".... has been added.....");
    }


    void showavailablebooks() {
        System.out.println("available books are :");
        for (String book : this.books) {
            if (book == null) {
                //break;------//issue book jdi null hoye jy tale porer books shor krbe na tai continue
                continue;
            }
            System.out.println("*..." + book);
        }
    }


    void issuebook(String book) {

        //for (String b:this.books){}    -----------use korle i r value pabo na
        for (int i = 0; i < this.books.length; i++) {
            if (this.books[i].equals(book)) {
                System.out.println("the book has been issued");
                this.books[i] = null;
                //String b =this.books[i];
                return;
            }
            System.out.println("*..." + book);
        }
        System.out.println("this book does not exists");
    }


    void returnbook(String book) {
        addbook(book);


    }
}





public class cwh_chapter11_online_library {
    public static void main(String[] args) {

        library centrallibrary =new library();
        centrallibrary.addbook("think and grow rich");
        centrallibrary.addbook("big data book");
        centrallibrary.addbook("mechine learning book");
        centrallibrary.addbook("data science book");
        centrallibrary.addbook("python book");
        centrallibrary.addbook("data structure book");
        centrallibrary.addbook("java programming book");
        centrallibrary.addbook("c programming book");
        centrallibrary.addbook("nonte fonte");
        centrallibrary.addbook("gopal var");

        centrallibrary.showavailablebooks();

        centrallibrary.issuebook("python book");
        centrallibrary.showavailablebooks();

        centrallibrary.returnbook("python book");
        centrallibrary.showavailablebooks();
    }
}

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