2025-26 II-I VR23-OBJECT-ORIENTED PROGRAMMING THROUGH JAVA LAB

Netaji_VR23 - OOPS JAVA LAB

Course Objectives:

• Practice object-oriented programming in the Java programming language.
• Implement Classes, Objects, Methods, Inheritance, Exception Handling, and Runtime Polymorphism.
• Illustrate JDBC connectivity and user-defined exception mechanisms.
• Construct Threads, Event Handling, and JavaFX GUI interfaces.

Topics Covered:

• OOP Fundamentals - data types, control structures
• Classes, Methods, Objects, Inheritance, Polymorphism
• Exception Handling, Threads, Packages, Interfaces
• File Handling, I/O Streams, JavaFX GUI

Sample Lab Exercises:

Exercise 1:

1. Display default values of all primitive data types in Java.
2. Program to find the roots of a quadratic equation and describe the nature of roots based on discriminant.

Exercise 2:

1. Binary search implementation in Java.
2. Bubble sort implementation.
3. StringBuffer operations - delete and remove characters.

Exercise 3:

1. Implementing a class with methods and invoking them in main.
2. Method Overloading.
3. Constructors and Constructor Overloading.

Exercise 4:

1. Single Inheritance.
2. Multilevel Inheritance.
3. Abstract class to find areas of different shapes.

Exercise 5:

1. Example of “super” keyword.
2. Interface implementation and its inheritance capabilities.
3. Runtime Polymorphism.

Exercise 6:

1. Exception Handling mechanism.
2. Multiple catch clauses.
3. Java Built-in Exceptions.
4. User Defined Exceptions.

Exercise 7:

1. Create threads using both Thread class and Runnable interface to display messages at different intervals.
2. Illustrating isAlive() and join() methods.
3. Daemon Threads.
4. Producer-Consumer problem.

Exercise 8:

1. Importing and using user-defined packages.
2. Creating a JavaFX GUI with text and image (ImageView).
3. Tip Calculator using JavaFX components.

Prepared by: G. Netaji

📄 Download Full PDF

2025-26 II-I VR23-OBJECT-ORIENTED PROGRAMMING THROUGH JAVA LAB

netaji gandi Sunday, June 29, 2025

DATA WAREHOUSING AND MINING (MCA2104)

 

UNIT I

Introduction to Data mining, types of Data, Data Quality, Data Processing, Measures of Similarity and  Dissimilarity, Exploring Data: Data Set, Summary Statistics, Visualization, Data Warehouse, OLAP and  multi dimensional data analysis. 

UNIT II

Classification: Basic Concepts, Decision Trees and model evaluation: General approach for solving a classification problem, Decision Tree induction, Model over fitting: due to presence of noise, due to lack of representation samples, Evaluating the performance of classifier. Nearest Neighborhood classifier, Bayesian Classifier, Support vector Machines: Linear SVM, Separable and Non Separable case. 

UNIT III

Association Analysis: Problem Definition, Frequent Item-set generation, rule generation, compact representation of frequent item sets, FP-Growth Algorithms. Handling Categorical, Continuous attributes, Concept hierarchy, Sequential, Sub graph patterns

 

UNIT IV

Clustering: Overview, K-means, Agglomerative Hierarchical clustering, DBSCAN, Cluster evaluation: overview, Unsupervised Cluster Evaluation using cohesion and separation, using proximity matrix, Scalable Clustering algorithm 

 

UNIT V

Web data mining: Introduction, Web terminology and characteristics, Web content mining, Web usage mining, web structure mining, Search Engines: Characteristics, Functionality, Architecture, Ranking of Web Pages, Enterprise search

Download Textbooks

1) Introduction to Data Mining, Tan, Steinbach and Vipin Kumar, Pearson Education, 2016
2) Data Mining: Concepts and Techniques, 2ndEdition, Jiawei Han and Micheline Kamber, ELSEVIER

DATA WAREHOUSING AND MINING (MCA2104)

netaji gandi Sunday, February 9, 2025

 

File Uploading in PHP

---

PHP allow you to upload any type of a file i.e. image, binary or text files.etc..,PHP has one in built global variable i.e. $_FILES, it contains all information about file.By the help of $_FILES global variable, we can get file name, file type, file size and temparary file name associated with file.

• $_FILES['filename']['name'] - returns file name.
• $_FILES['filename']['type'] - returns MIME type of the file.
• $_FILES['filename']['size'] - returns size of the file (in bytes).
• $_FILES['filename']['tmp_name'] - returns temporary file name of the file which was stored on the server.

In HTML, File Upload control can be created by using following:

<input type="file" name="fileupload"/>

In PHP, To upload the file we have to use the function called move_uploaded_file().

☞ move_uploaded_file() function

The move_uploaded_file() function is used to move the uploaded file to a new location. It moves the file only if it is uploaded through the POST request.

Syntax:
  move_uploaded_file ( string $filename , string $destination )

First Configure the php.ini File by ensure that PHP is configured to allow file uploads. In your php.ini file, search for the file_uploads directive, and set it to On i.e. file_uploads = On

Example: "fileupload.php"

<html>
<head>
<title>File Upload</title>
</head>
<body>
<form method="post" enctype="multipart/form-data">  
    Select File: <input type="file" name="fileToUpload"/>  
    <input type="submit" value="Upload Any File" name="submit"/>  
</form>
<?php  
if(isset($_POST["submit"]))
{
$target_path = "D:/";  
$target_path=$target_path.basename($_FILES['fileToUpload'] ['name'] );  

if(move_uploaded_file($_FILES['fileToUpload']['tmp_name'], $target_path)) 
{  
    echo "File uploaded successfully!";  
} 
else
{  
    echo "Sorry, file not uploaded, please try again!";  
}
}
?>  
</body>
</html>

Output :

File Uploading in PHP

netaji gandi Monday, November 25, 2024

 

File Handling in PHP

---

In PHP File System allows us to create file, read file line by line, read file character by character, write file, append file, delete file and close file.

PHP supports following functions to handle files.

• fopen()
• fread()
• fwrite()
• fclose()
• unlink()

☞ fopen()

In PHP, The fopen() function is used to open a file in read mode or write mode or in both read and write modes. And this function accepts two arguments: $filename and $mode.

Syntax:    fopen(string $filename , string $mode)

The $filename represents the file to be opended and $mode represents the file mode for example read-only, read-write, write-only etc.

The fopen() supports the following modes:

r	-	Read Only
w	-	Write Only
a	-	Append
r+	-	Read & Write.
w+	-	Read & Write.

Example: "fopen.php"

<?php    
$filename = "E:\\netaji\\simple.txt";    
$fp = fopen($filename, "r");//open file in read mode
?>

  Note : The above code will open the file in in read mode.

☞ fread()

In PHP, The fread() function is used to read data of the file. It requires two arguments: file resource and file size.

Syntax:    fread(resource $fp,int $length)

Where $fp represents file pointer that is created by fopen() function. And $length represents length of file (bytes)to be read.

Example: "fread.php"

<?php    
$filename = "D:\\Netaji\\file.txt";    
$fp = fopen($filename, "r");//open file in read mode    
$content = fread($fp, filesize($filename));//read file    
echo "$content";//printing data of file  
fclose($fp);//close file    
?>

  Note : To read content of file, we need to open file with r , r+, w+ mode.

Output :

☞ fwrite()

In PHP, The fwrite() function is used to write the content (string) into file.And It requires two arguments: file resource and data(string)

If the file opened in write(w) mode, the fwrite() function will erase the previous data of the file and writes the new data or If the file opened in append(a) mode, the fwrite() function appends the new data at the end of the previous data.

Syntax:    fwrite(resource $fp,string $data)

Where $fp represents file pointer that is created by fopen() function.And $data represents the data to be written.

☞ If the file opened in write(w) mode :

Example: "fwrite.php"

<?php    
$filename = "D:\\netaji\\file.txt";  
$fp = fopen($filename, "w");//open file in write mode    
fwrite($fp,'PHP is a Scripting Language');
echo "Data written successfully..";
fclose($fp);//close file    
?>

Output :

Text File :

☞ If the file opened in append(a) mode :

Example: "fappend.php"

<?php    
$filename = "D:\\netaji\\file.txt";    
$fp = fopen($filename, "a");//open file in write mode    
fwrite($fp,' at server side');
echo "Data appended successfully..";
fclose($fp);//close file    
?>

Output :

Text File :

  Note : To write data into file, you need to use w,r+,w+ mode.

☞ fclose()

In PHP, The fclose() function is used to close an open file.And It requires one argument i.e. "File Pointer"

Syntax:    fclose(resource $fp)

Where $fp represents file pointer that is created by fopen() function.

Example: "fclose.php"

<?php    
$filename = "D:\\netaji\\file.txt";  
$fp = fopen($filename, "r");//open file in write mode    
// To close the file 
fclose($fp);   
?>

☞ unlink()

In PHP, The unlink() function is used to delete any file.And It requires one argument i.e. "File Name"

Syntax:    unlink(string $filename)

Where $filename represents name of the file to be remove.

Example: "unlink.php"

<?php
$status=unlink('file.txt');
if($status){
echo "File deleted successfully";
}else{
echo "Sorry!";
}
?>

Output :

File Handling in PHP

netaji gandi