JAVA Quote of the Day Tutorial Step By Step

https://www.facebook.com/Oxus20

CONTENTS
Problem Statement .................................................... 3
Solution ............................................................. 3
Code Explanation ..................................................... 5
Package and Import ................................................. 5
Class .............................................................. 6
Method MAIN ........................................................ 6
Array .............................................................. 6
Loop ............................................................... 7
Calendar.DAY_OF_YEAR ............................................... 8
Conclusion ........................................................... 9

Page 1 of 9


RECOMMENDATION AND GUIDANCE
Programming is fun and easy if and only if you concentrate and
consider the Problem Solving process which consists of a sequence of
sections that fit together depending on the type of problem to be
solved. These are:


Understand the problem



Generating possible solutions



Refine the Solutions and select the best solution(s).



Implement and code the best selected solution



Test the code

The process is only a guide for problem solving. It is useful to have
a structure to follow to make sure that nothing is overlooked and
ignored.
Abdul Rahman Sherzad

Special Thanks goes to Nooria Esmaelzadeh for her support taking
minute of the session and drafting the idea together

Page 2 of 9


PROBLEM STATEMENT

Write a program to display a different quote each day of the year as
the quote of the day. The program should pick a random quote from an
array of quotes you provide based on day of the year; and it must show
that same picked and selected quote for the whole day and change to a
new one the next day.
NOTE: Remember and keep in mind the already picked and selected quotes
should not pick again until the next year.

SOLUTION

Do you think it is simple or complex?

REMEMBER "Every problem has a

solution, Tom Hanks" 
To be honest it is quite easy and simple. Followings ingredients are
required solving the problem efficiently:


Array: An array is needed to store the quotes



Loop: Using loop can help initialize the dummy quotes for the
demonstration and testing purpose inside the array.



Calenday.DAY_OF_YEAR: The constant DAY_OF_YEAR of the class
Calendar returns day of year ranges from 1 to 365 (366 for the
leap years).

Page 3 of 9


Following is the complete code of the "Quote of the Day" java
application program:
/*
* Copyright (c) 2013, OXUS20 and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*/
import java.util.Calendar;
/**
* Display Quote Of The Day
* This class picks a quote from an array of quotes based on day of the year.
*/
public class QuoteOfTheDay {
public static void main(String[] args) {
// Array quotes[] to store the quotes
String quotes[] = new String[366];
// Loop initialize dummy quotes inside array quotes[]
for (int i = 0; i < quotes.length; i++) {
quotes[i] = "Dummy quote of the day " + (i + 1);
}
// Construct Calendar object "c"
Calendar c = Calendar.getInstance();
// quote_index represent day of the year
int quote_index = c.get(Calendar.DAY_OF_YEAR);
// quotes[quote_index] returns day of the year quote
String quote_of_the_day = quotes[quote_index];
// Display the code the screen
System.out.println(quote_of_the_day);
}
}

Page 4 of 9


CODE EXPLANATION

Let's break down the above code of "Quote of the Day" application
program into pieces for the purpose of explanation as follow:
PACKAGE AND IMPORT

Package = directory: Java classes can be grouped together in packages.
A package name is the same as the directory (folder) name which
contains the .java files.
To import classes into the current file, put an import statement at
the beginning of the file before any type definitions but after
the package statement, if there is one. Here's how you would import
the Calendar class from the java.util package.
import java.util.Calendar;

From now on you can refer to the Calendar class by its simple name as
follow:

Otherwise if you did not import the Calendar class you had to use
following method in order to access the Calendar class:
java.util.Calendar c = java.util.Calendar.getInstance();

Page 5 of 9


CLASS

Java class is nothing but a template for object you are going to
create or it is a blueprint. When we create class in java the first
step is keyword class and then name of the class or identifier we can
say i.e. "QuoteOfTheDay".
public class QuoteOfTheDay {

}

The curly braces symbols demonstrates the class body { }; and between
this all things related to the class i.e. property and method will
come here.
METHOD MAIN

In Java, you need to have a method named main () in at least one
class. The following is what must appear in a real Java program.
public static void main(String[] args) {

}

In the Java language, when you execute a class with the Java
interpreter, the runtime system starts by calling the class's main
() method. The main () method then calls all the other methods
required to run your application.

ARRAY

An array is a container object
that holds a fixed number of
values of a single type. Array
length is fixed after creation.

Page 6 of 9


In simple words it is a programming construct which helps replacing
following:
String
String
String
String

quote1
quote2
quote3
quote4

=
=
=
=

"Dummy
"Dummy
"Dummy
"Dummy

quote
quote
quote
quote

of
of
of
of

the
the
the
the

day
day
day
day

1";
2";
3";
4";

String quote5 = "Dummy quote of the day 5";

With following:
quotes[0] = "Dummy quote of the day

1";
2";
3";
4";

quotes[4] = "Dummy quote of the day 5";
LOOP

There may be a situation when we need to execute a block of code
several number of times, and is often referred to as a loop.
In simple words it is a programming construct which helps replacing
following:

1";
2";
3";
4";

quotes[4]
quotes[5]
quotes[6]
quotes[7]
quotes[8]

5";
6";
7";
8";
9";

=
=
=
=
=

"Dummy
"Dummy
"Dummy
"Dummy
"Dummy

quote
quote
quote
quote
quote

of
of
of
of
of

the
the
the
the
the

day
day
day
day
day

quotes[365] = "Dummy quote of the day 365";

With following:
for (int i = 0; i < quotes.length; i++) {
quotes[i] = "Dummy quote of the day " + (i + 1);
}

Page 7 of 9


CALENDAR.DAY_OF_YEAR

As it is already mentioned the DAY_OF_YEAR is a constant of the
Calendar class and returns the day of the year ranges from 0 to 365
(for the leap years 366). Therefore, we can use this as index of the
array quotes [] in order to display the quote for the current day of
the year. Next day the next quote will be displayed.
// Construct Calendar object "c"
// quote_index represent day of the year
int quote_index = c.get(Calendar.DAY_OF_YEAR);
// quotes[quote_index] returns day of the year quote
String quote_of_the_day = quotes[quote_index];
// Display the code the screen
System.out.println(quote_of_the_day);

Page 8 of 9


CONCLUSION

Good programmers don't have to be geniuses but they should be smart,
inventive and creative and a flare in problem solving. In addition,
good programmers passionate about technology, programs as a hobby and
learn new technologies on his/her own.
The concept of "Quote of the Day" for the year can be customized to be
used as follow:


Monthly Quote of the Day: To display the quote according the day
of the month.



Weekly Quote of the Day: To display the quote based on day of the
week and reset back next week.



Hourly Quote of the Day: To display the quote each hour



Minutely Quote of the Day: To display different quote each minute

Even can be used with different concept accomplishing different tasks
and idea; for example, the same concept can be customized to be used
for the banner advertisement, different themes and backgrounds
monthly, weekly, daily, hourly, minutely and/or even secondly.

Page 9 of 9

JAVA Quote of the Day Tutorial Step By Step

Recommandé

Recommandé

Contenu connexe

Plus de Abdul Rahman Sherzad

Plus de Abdul Rahman Sherzad (20)

Dernier

Dernier (20)

JAVA Quote of the Day Tutorial Step By Step