Programming Example
Define a class called Library with the following description:
Study this program carefully to understand the logic, output, and explanation in a structured way.
Define a class called Library with the following description:
Instance Variables/Data Members:
int accNum — stores the accession number of the book.
String title — stores the title of the book.
String author — stores the name of the author.
Member methods:
Accession Number Title Author
Write a main method to create an object of the class and call the above member methods.
import java.util.Scanner;
public class Library
{
private int accNum;
private String title;
private String author;
void input() {
Scanner in = new Scanner(System.in);
System.out.print("Enter book title: ");
title = in.nextLine();
System.out.print("Enter author: ");
author = in.nextLine();
System.out.print("Enter accession number: ");
accNum = in.nextInt();
}
void compute() {
Scanner in = new Scanner(System.in);
System.out.print("Enter number of days late: ");
int days = in.nextInt();
int fine = days * 2;
System.out.println("Fine = Rs." + fine);
}
void display() {
System.out.println("Accession Number\tTitle\tAuthor");
System.out.println(accNum + "\t\t" + title + "\t" + author);
}
public static void main(String args[]) {
Library obj = new Library();
obj.input();
obj.display();
obj.compute();
}
}First read the algorithm, then study the program code line by line. After that, compare the code with the output and finally go through the explanation. This approach helps learners understand both the logic and the implementation properly.
After understanding this example, try to rewrite the same program without looking at the code. Then change some values or logic and run it again. This helps improve confidence and keeps learners engaged on the page for longer.