SLIP 16-1
import java.util.*;
import java.io.*;
public class Collection {
public static void main(String args[]) throws IOException {
Set ts = new TreeSet();
ts.add("Red");
ts.add("Blue");
ts.add("Yellow");
ts.add("Pink");
ts.add("Baby Pink");
System.out.println("TreeSet in ascending order: " + ts);
}
SLIP 16-2
import java.sql.*;
4.
5. public class jdbc {
6. public static void main(String[] args) {
7. try {
8. // Establish a connection to the database
9. Connection conn =
DriverManager.getConnection("jdbc:postgresql://localhost:5434/postgres",
"postgres", "saqlain");
10.
11. // Prepare a statement to insert data into the Teacher table
12. PreparedStatement insertStmt = conn.prepareStatement("INSERT
INTO Teacher (Tno, Tname, Subject) VALUES (?, ?, ?)");
13.
14. // Insert at least 5 records into the Teacher table
15. insertStmt.setInt(1, 1);
16. insertStmt.setString(2, "John Doe");
17. insertStmt.setString(3, "JAVA");
18. insertStmt.executeUpdate();
19.
20. insertStmt.setInt(1, 2);
21. insertStmt.setString(2, "Jane Smith");
22. insertStmt.setString(3, "Python");
23. insertStmt.executeUpdate();
24.
25. insertStmt.setInt(1, 3);
26. insertStmt.setString(2, "Mike Johnson");
27. insertStmt.setString(3, "C++");
28. insertStmt.executeUpdate();
29.
30. insertStmt.setInt(1, 4);
31. insertStmt.setString(2, "Sarah Lee");
32. insertStmt.setString(3, "JAVA");
33. insertStmt.executeUpdate();
insertStmt.setInt(1, 5); insertStmt.setString(2, "David Chen"); insertStmt.setString(3, "PHP");insertStmt.executeUpdate(); // Prepare a statement to retrieve data from the Teacher table
SLIP 17-1
import java.util.*;
public class SortedIntegers {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter the number of integers: ");
int n = scanner.nextInt();
Set<Integer> set = new TreeSet<>();
for (int i = 1; i <= n; i++) {
System.out.print("Enter integer #" + i + ": ");
int num = scanner.nextInt();
set.add(num);
}
System.out.println("The integers in sorted order are: ");
for (int num : set) {
System.out.print(num + " ");
}
}
}
SLIP 17-2
import java.awt.BorderLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class NumberDisplay implements Runnable {
private JTextField textField;
public NumberDisplay(JTextField textField) {
this.textField = textField;
}
@Override
public void run() {
for (int i = 1; i <= 100; i++) {
textField.setText(Integer.toString(i));
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
public static void main(String[] args) {
JFrame frame = new JFrame("Number Display");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JTextField textField = new JTextField(10);
JButton button = new JButton("Start");
JPanel panel = new JPanel();
panel.add(textField);
panel.add(button);
frame.add(panel, BorderLayout.CENTER);
frame.pack();
frame.setVisible(true);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
NumberDisplay numberDisplay = new NumberDisplay(textField);
Thread thread = new Thread(numberDisplay);
thread.start();
}
});
}
}
SLIP 18-1
public class ThreadInfo {
public static void main(String[] args) {
Thread thread = Thread.currentThread();
System.out.println("Thread Name: " + thread.getName());
System.out.println("Thread Priority: " + thread.getPriority());
}
}
SLIP 18-2
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class StudentDetails extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
response.setContentType("text/html");
PrintWriter out = response.getWriter();
String seatNo = request.getParameter("seatno");
String studName = request.getParameter("studname");
String studentClass = request.getParameter("class");
int totalMarks = Integer.parseInt(request.getParameter("totalmarks"));
double percentage = (double) totalMarks / 5;
String grade;
if (percentage >= 80) {
grade = "A+";
} else if (percentage >= 70) {
grade = "A";
} else if (percentage >= 60) {
grade = "B";
} else if (percentage >= 50) {
grade = "C";
} else {
grade = "F";
}
out.println("<html>");
out.println("<head>");
out.println("<title>Student Details</title>");
out.println("</head>");
out.println("<body>");
out.println("<h1>Student Details</h1>");
out.println("<table>");
out.println("<tr><td>Seat No:</td><td>" + seatNo + "</td></tr>");
out.println("<tr><td>Student Name:</td><td>" + studName +
"</td></tr>");
out.println("<tr><td>Class:</td><td>" + studentClass + "</td></tr>");
out.println("<tr><td>Total Marks:</td><td>" + totalMarks + "</td></tr>");
out.println("<tr><td>Percentage:</td><td>" + percentage + "%</td></tr>");
out.println("<tr><td>Grade:</td><td>" + grade + "</td></tr>");
out.println("</table>");
out.println("</body>");
out.println("</html>");
}
}
SLIP 19-1
import java.util.LinkedList;
import java.util.Scanner;
public class NegativeIntegersInLinkedList {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
LinkedList<Integer> list = new LinkedList<Integer>();
System.out.print("Enter the number of integers: ");
int n = sc.nextInt();
System.out.println("Enter " + n + " integers:");
for (int i = 0; i < n; i++) {
int num = sc.nextInt();
list.add(num);
}
System.out.println("Negative Integers:");
for (int i : list) {
if (i < 0) {
System.out.println(i);
}
}
}
}
SLIP 19-2
import java.io.IOException;
import java.io.PrintWriter;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse
response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();
String username = request.getParameter("username");
String password = request.getParameter("password");
try {
// Load the JDBC driver
Class.forName("com.mysql.cj.jdbc.Driver");
// Set up the connection
Connection conn =
DriverManager.getConnection("jdbc:mysql://localhost:3306/mydatabase",
"root", "password");
// Prepare the statement
PreparedStatement stmt = conn.prepareStatement("SELECT * FROM
users WHERE username=? AND password=?");
stmt.setString(1, username);
stmt.setString(2, password);
// Execute the query
ResultSet rs = stmt.executeQuery();
// Check if the user exists
if (rs.next()) {
out.println("<h1>Login successful!</h1>");
} else {
out.println("<h1>Error: Invalid username or password.</h1>");
}
// Close the resources
rs.close();
stmt.close();
conn.close();
} catch (ClassNotFoundException | SQLException e) {
e.printStackTrace();
}
}
}
SLIP 20-1
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Number to Words Converter</title>
<style>
.red {
color: red;
}
</style>
</head>
<body>
<h1>Number to Words Converter</h1>
<form method="post">
Enter a number: <input type="text" name="number" /><br />
<input type="submit" value="Convert" />
</form>
<br />
<%-- Get the number from the request parameter --%>
<% String numberStr = request.getParameter("number"); %>
<%-- Check if the number is not null and not empty --%>
<% if (numberStr != null && !numberStr.trim().isEmpty()) { %>
<%-- Convert the number to words --%>
<% String[] words = { "Zero", "One", "Two", "Three", "Four", "Five", "Six",
"Seven", "Eight", "Nine" }; %>
<% String number = numberStr.trim(); %>
<span class="red">
<% for (int i = 0; i < number.length(); i++) { %>
<%= words[Character.getNumericValue(number.charAt(i))] + " " %>
<% } %>
</span>
<% } %>
</body>
</html>
SLIP 20-2
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Dimension;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.IOException;
import javax.imageio.ImageIO;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.Timer;
public class BlinkingImage extends JPanel implements ActionListener {
private static final long serialVersionUID = 1L;
private Image image;
private boolean blinkOn = true;
public BlinkingImage(Image image) {
this.image = image;
Timer timer = new Timer(500, this); // timer fires every 500ms
timer.start();
}
@Override
protected void paintComponent(Graphics g) {
super.paintComponent(g);
if (blinkOn) {
g.drawImage(image, 0, 0, this);
}
}
@Override
public void actionPerformed(ActionEvent e) {
blinkOn = !blinkOn;
repaint();
}
public static void main(String[] args) {
try {
Image image = ImageIO.read(new File("path/to/image.png"));
JPanel contentPane = new BlinkingImage(image);
contentPane.setPreferredSize(new Dimension(image.getWidth(null),
image.getHeight(null)));
JFrame frame = new JFrame("Blinking Image");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(contentPane, BorderLayout.CENTER);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
} catch (IOException e) {
e.printStackTrace();
}
}
}
SLIP 21-1
import java.util.Iterator;
import java.util.LinkedList;
import java.util.Scanner;
public class SubjectNames {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.print("Enter the number of subjects: ");
int n = sc.nextInt();
LinkedList<String> subjects = new LinkedList<String>();
System.out.println("Enter the subject names:");
for (int i = 0; i < n; i++) {
String subject = sc.next();
subjects.add(subject);
}
System.out.println("Subject names:");
Iterator<String> iterator = subjects.iterator();
while (iterator.hasNext()) {
String subject = iterator.next();
System.out.println(subject);
}
}
}
SLIP 21-2
import java.util.LinkedList;
public class ProducerConsumer {
public static void main(String[] args) {
LinkedList<Integer> buffer = new LinkedList<>();
int bufferSize = 5;
Thread producerThread = new Thread(new Producer(buffer, bufferSize),
"Producer");
Thread consumerThread = new Thread(new Consumer(buffer),
"Consumer");
producerThread.start();
consumerThread.start();
}
}
class Producer implements Runnable {
private final LinkedList<Integer> buffer;
private final int bufferSize;
private int value = 0;
public Producer(LinkedList<Integer> buffer, int bufferSize) {
this.buffer = buffer;
this.bufferSize = bufferSize;
}
@Override
public void run() {
while (true) {
synchronized (buffer) {
if (buffer.size() < bufferSize) {
buffer.add(value);
System.out.println(Thread.currentThread().getName() + " produced "
+ value);
value++;
buffer.notifyAll();
} else {
try {
buffer.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
}
}
class Consumer implements Runnable {
private final LinkedList<Integer> buffer;
public Consumer(LinkedList<Integer> buffer) {
this.buffer = buffer;
}
@Override
public void run() {
while (true) {
synchronized (buffer) {
if (buffer.isEmpty()) {
try {
buffer.wait();
} catch (InterruptedException e) {
e.printStackTrace();
}
} else {
int value = buffer.removeFirst();
System.out.println(Thread.currentThread().getName() + " consumed
" + value);
buffer.notifyAll();
}
}
}
}
}
SLIP 22-1
import java.sql.*;
public class EmployeeManagement {
static final String JDBC_DRIVER = "com.mysql.jdbc.Driver";
static final String DB_URL = "jdbc:mysql://localhost:3306/mydatabase";
static final String USER = "username";
static final String PASSWORD = "password";
public static void main(String[] args) {
Connection conn = null;
Statement stmt = null;
try {
Class.forName(JDBC_DRIVER);
conn = DriverManager.getConnection(DB_URL, USER, PASSWORD);
stmt = conn.createStatement();
int choice;
do {
System.out.println("Menu:");
System.out.println("1. Insert");
System.out.println("2. Update");
System.out.println("3. Display");
System.out.println("4. Exit");
System.out.print("Enter your choice: ");
choice = Integer.parseInt(System.console().readLine());
switch (choice) {
case 1:
System.out.print("Enter employee number: ");
int eno = Integer.parseInt(System.console().readLine());
System.out.print("Enter employee name: ");
String ename = System.console().readLine();
System.out.print("Enter employee salary: ");
double salary = Double.parseDouble(System.console().readLine());
String sql = "INSERT INTO Employee (ENo, EName, Salary) VALUES
(" + eno + ", '" + ename + "', " + salary + ")";
stmt.executeUpdate(sql);
System.out.println("Record inserted successfully.");
break;
case 2:
System.out.print("Enter employee number: ");
eno = Integer.parseInt(System.console().readLine());
System.out.print("Enter new employee name: ");
ename = System.console().readLine();
System.out.print("Enter new employee salary: ");
salary = Double.parseDouble(System.console().readLine());
sql = "UPDATE Employee SET EName='" + ename + "', Salary=" +
salary + " WHERE ENo=" + eno;
int rowsAffected = stmt.executeUpdate(sql);
if (rowsAffected == 0) {
System.out.println("No records found with employee number "
+ eno);
} else {
System.out.println(rowsAffected + " record(s) updated
successfully.");
}
break;
case 3:
sql = "SELECT * FROM Employee";
ResultSet rs = stmt.executeQuery(sql);
while (rs.next()) {
eno = rs.getInt("ENo");
ename = rs.getString("EName");
salary = rs.getDouble("Salary");
System.out.println("Employee number: " + eno + ", Employee
name: " + ename + ", Employee salary: " + salary);
}
rs.close();
break;
case 4:
System.out.println("Exiting program.");
break;
default:
System.out.println("Invalid choice. Please try again.");
break;
}
} while (choice != 4);
} catch (Exception e) {
e.printStackTrace();
} finally {
try {
if (stmt != null) {
stmt.close();
}
if (conn != null) {
conn.close();
}
} catch (SQLException e) {
e.printStackTrace();
}
}
}
}
SLIP 22-2
<%@ page language="java" %>
<html>
<head>
<title>Greeting Page</title>
</head>
<body>
<h1>Welcome to our website</h1>
<%
String userName = request.getParameter("userName"); // retrieve user input
from the form
String greetingMessage = "Hello, " + userName;
java.util.Date date = new java.util.Date(); // get the current date and time
java.text.SimpleDateFormat sdf = new java.text.SimpleDateFormat("hh:mm:ss
a"); // format the date and time
int hour = Integer.parseInt(sdf.format(date).substring(0, 2)); // extract the hour
from the formatted date
if (hour >= 0 && hour < 12) {
greetingMessage += ". Good morning!";
} else if (hour >= 12 && hour < 18) {
greetingMessage += ". Good afternoon!";
} else {
greetingMessage += ". Good evening!";
}
%>
<p><%= greetingMessage %></p>
<form action="greeting.jsp" method="get">
Enter your name: <input type="text" name="userName">
<input type="submit" value="Submit">
</form>
</body>
</html>
SLIP 23-1
import java.util.Scanner;
public class VowelDisplay {
public static void main(String[] args) {
Scanner scanner = new Scanner(System.in);
System.out.print("Enter a string: ");
String inputString = scanner.nextLine().toLowerCase(); // convert input to
lowercase
for (int i = 0; i < inputString.length(); i++) {
char c = inputString.charAt(i);
if (isVowel(c)) {
System.out.print(c + " ");
try {
Thread.sleep(3000); // pause for 3 seconds
} catch (InterruptedException e) {
e.printStackTrace();
}
}
}
}
public static boolean isVowel(char c) {
return (c == 'a' || c == 'e' || c == 'i' || c == 'o' || c == 'u');
}
}
SLIP 23-2
import java.util.ArrayList;
import java.util.Iterator;
import java.util.ListIterator;
public class StudentNames {
public static void main(String[] args) {
ArrayList<String> studentNames = new ArrayList<>();
// Accept N student names through command line and add them to the
ArrayList
for (int i = 0; i < args.length; i++) {
studentNames.add(args[i]);
}
// Display the student names using Iterator interface
System.out.println("Student names using Iterator:");
Iterator<String> iterator = studentNames.iterator();
while (iterator.hasNext()) {
System.out.println(iterator.next());
}
// Display the student names using ListIterator interface
System.out.println("\nStudent names using ListIterator:");
ListIterator<String> listIterator = studentNames.listIterator();
while (listIterator.hasNext()) {
System.out.println(listIterator.next());
}
}
}
SLIP 24-1
import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import javax.swing.JFrame;
import javax.swing.JPanel;
public class ScrollingText extends JPanel implements Runnable {
private int x, y;
private String message;
private Thread thread;
private boolean running;
public ScrollingText(String message) {
this.message = message;
x = getWidth();
y = getHeight() / 2;
setFont(new Font("Arial", Font.BOLD, 20));
setForeground(Color.RED);
setBackground(Color.WHITE);
thread = new Thread(this);
running = true;
thread.start();
}
public void run() {
while (running) {
try {
Thread.sleep(20); // Adjust the speed of scrolling here
} catch (InterruptedException e) {
e.printStackTrace();
}
x--;
if (x < -getFontMetrics(getFont()).stringWidth(message)) {
x = getWidth();
}
repaint();
}
}
public void paintComponent(Graphics g) {
super.paintComponent(g);
g.drawString(message, x, y);
}
public static void main(String[] args) {
JFrame frame = new JFrame("Scrolling Text");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(400, 100);
ScrollingText scrollingText = new ScrollingText("This is scrolling text");
frame.add(scrollingText);
frame.setVisible(true);
}
}
SLIP 24-2
<%@ page language="java" %>
<%@ page import="java.io.*, java.util.*" %>
<%
String username = request.getParameter("username");
String password = request.getParameter("password");
if (username.equals(password)) {
response.sendRedirect("Login.html?message=Login Successfully");
} else {
response.sendRedirect("Error.html?message=Login Failed");
}
%>
SLIP 25-1
<%@ page language="java" %>
<%@ page import="java.io.*, java.util.*" %>
<%
String name = request.getParameter("name");
int age = Integer.parseInt(request.getParameter("age"));
if (age >= 18) {
out.println("<h3>" + name + ", you are eligible to vote.</h3>");
} else {
out.println("<h3>" + name + ", you are not eligible to vote.</h3>");
}
%>
<form method="post" action="">
<label for="name">Name:</label>
<input type="text" name="name" id="name" required><br><br>
<label for="age">Age:</label>
<input type="number" name="age" id="age" required><br><br>
<input type="submit" value="Check Eligibility">
</form>
SLIP 25-2
Hya slip ch answer nhiye gheu nka
SLIP 26-1
import java.sql.*;
public class DeleteEmployeeDetails {
public static void main(String[] args) {
try {
// Step 1: Load the JDBC driver
Class.forName("com.mysql.jdbc.Driver");
// Step 2: Establish the connection to the database
String url = "jdbc:mysql://localhost:3306/yourdatabase";
String username = "yourusername";
String password = "yourpassword";
Connection con = DriverManager.getConnection(url, username,
password);
// Step 3: Create a prepared statement to delete the employee details
PreparedStatement pstmt = con.prepareStatement("DELETE FROM
Employee WHERE ENo=?");
// Step 4: Set the employee ID parameter for the prepared statement
int employeeID = Integer.parseInt(args[0]);
pstmt.setInt(1, employeeID);
// Step 5: Execute the prepared statement
int rowsAffected = pstmt.executeUpdate();
System.out.println(rowsAffected + " row(s) deleted.");
// Step 6: Close the resources
pstmt.close();
con.close();
} catch (Exception e) {
e.printStackTrace();
}
}
}
SLIP 26-2
<!DOCTYPE html>
<html>
<head>
<title>Sum of First and Last Digit</title>
</head>
<body>
<h1>Calculate Sum of First and Last Digit</h1>
<%
// Retrieve the number from the request parameter
int num = Integer.parseInt(request.getParameter("number"));
// Extract the first and last digit of the number
int firstDigit = num;
while (firstDigit >= 10) {
firstDigit /= 10;
}
int lastDigit = num % 10;
// Calculate the sum of first and last digit
int sum = firstDigit + lastDigit;
// Display the sum in red color with font size 18
out.println("<p style=\"color:red;font-size:18px;\">Sum of first and
last digit of " + num + " is " + sum + "</p>");
%>
<form action="" method="get">
<label for="number">Enter a number:</label>
<input type="number" id="number" name="number" required>
<button type="submit">Calculate</button>
</form>
</body>
</html>
SLIP 27-1
import java.sql.*;
import javax.swing.*;
import javax.swing.table.DefaultTableModel;
public class CollegeDetailsJTable extends JFrame {
// database connection details
static final String DB_URL = "jdbc:mysql://localhost:3306/college";
static final String DB_USER = "root";
static final String DB_PASSWORD = "password";
public CollegeDetailsJTable() {
super("College Details");
// create a JTable
JTable table = new JTable();
// set column names for the table
String[] columnNames = {"CID", "CName", "Address", "Year"};
// create a default table model with the column names
DefaultTableModel model = new DefaultTableModel(columnNames, 0);
// add data to the table model
try {
// create a database connection
Connection conn = DriverManager.getConnection(DB_URL, DB_USER,
DB_PASSWORD);
// create a statement
Statement stmt = conn.createStatement();
// execute a query to get college details
ResultSet rs = stmt.executeQuery("SELECT * FROM college");
// add each row to the table model
while (rs.next()) {
String cid = rs.getString("CID");
String cname = rs.getString("CName");
String address = rs.getString("Address");
int year = rs.getInt("Year");
model.addRow(new Object[] { cid, cname, address, year });
}
// close the result set, statement and connection
rs.close();
stmt.close();
conn.close();
} catch (SQLException e) {
e.printStackTrace();
}
// set the table model to the JTable
table.setModel(model);
// create a scroll pane for the table
JScrollPane scrollPane = new JScrollPane(table);
// add the scroll pane to the frame
getContentPane().add(scrollPane);
// set frame properties
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setLocationRelativeTo(null);
pack();
setVisible(true);
}
public static void main(String[] args) {
new CollegeDetailsJTable();
}
}
SLIP 27-2
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class ChangeSessionTimeout extends HttpServlet {
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
// Get the current session
HttpSession session = request.getSession();
// Set the inactive time interval to 10 minutes (in seconds)
session.setMaxInactiveInterval(600);
// Display a message
response.setContentType("text/html");
PrintWriter out = response.getWriter();
out.println("<html><body>");
out.println("<h3>Session Timeout Changed to 10 Minutes</h3>");
out.println("</body></html>");
}
}
SLIP 28-1
<%@ page language="java" %>
<html>
<head>
<title>Reverse String</title>
</head>
<body>
<h2>Enter a string to reverse:</h2>
<form method="post" action="reverse.jsp">
<input type="text" name="stringToReverse">
<input type="submit" value="Reverse">
</form>
<%
String inputString = request.getParameter("stringToReverse");
if (inputString != null) {
String reversedString = "";
for (int i = inputString.length() - 1; i >= 0; i--) {
reversedString += inputString.charAt(i);
}
out.print("<h2>Reversed string: " + reversedString + "</h2>");
}
%>
</body>
</html>
SLIP 28-2
public class CurrentThreadName {
public static void main(String[] args) {
Thread t = Thread.currentThread();
System.out.println("Currently executing thread: " + t.getName());
}
}
SLIP 29-1
import java.sql.*;
public class DonarTableColumnInfo {
public static void main(String[] args) {
String url = "jdbc:mysql://localhost:3306/mydb"; // replace mydb with your
database name
String username = "root"; // replace root with your MySQL username
String password = "password"; // replace password with your MySQL
password
try (Connection con = DriverManager.getConnection(url, username,
password)) {
String query = "SELECT * FROM DONAR";
PreparedStatement ps = con.prepareStatement(query);
ResultSet rs = ps.executeQuery();
ResultSetMetaData rsmd = rs.getMetaData();
int columnCount = rsmd.getColumnCount();
System.out.println("Column Name\t\tData Type");
System.out.println("------------------------------------------");
for (int i = 1; i <= columnCount; i++) {
String columnName = rsmd.getColumnName(i);
String dataType = rsmd.getColumnTypeName(i);
System.out.println(columnName + "\t\t\t" + dataType);
}
} catch (SQLException e) {
System.out.println("Error: " + e.getMessage());
}
}
}
SLIP 29-2
import java.util.LinkedList;
public class LinkedListDemo {
public static void main(String[] args) {
// Create a LinkedList of integers
LinkedList<Integer> list = new LinkedList<>();
// Add element at the first position
list.addFirst(10);
list.addFirst(20);
list.addFirst(30);
System.out.println("LinkedList after adding elements at first position: " +
list);
// Delete the last element
list.removeLast();
System.out.println("LinkedList after deleting last element: " + list);
// Display the size of LinkedList
System.out.println("Size of LinkedList: " + list.size());
}
}
SLIP 30-1
class Counter {
private int count = 0;
// synchronized method
public synchronized void increment() {
count++;
}
public int getCount() {
return count;
}
}
class MyThread extends Thread {
private Counter counter;
public MyThread(Counter counter) {
this.counter = counter;
}
public void run() {
for (int i = 0; i < 1000; i++) {
counter.increment();
}
}
}
public class SyncDemo {
public static void main(String[] args) throws InterruptedException {
Counter counter = new Counter();
MyThread thread1 = new MyThread(counter);
MyThread thread2 = new MyThread(counter);
thread1.start();
thread2.start();
thread1.join();
thread2.join();
System.out.println("Count: " + counter.getCount());
}
}
SLIP 30-2
import java.sql.*;
public class ScrollableResultSetExample {
public static void main(String[] args) {
try {
// Register JDBC driver
Class.forName("com.mysql.jdbc.Driver");
// Open a connection
Connection conn =
DriverManager.getConnection("jdbc:mysql://localhost:3306/mydb",
"username", "password");
// Create a Statement object with scrollable ResultSet
Statement stmt =
conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE,
ResultSet.CONCUR_READ_ONLY);
// Execute a query and get the ResultSet object
ResultSet rs = stmt.executeQuery("SELECT * FROM Teacher");
// Move the cursor to the last row
rs.last();
// Get the total number of rows in the ResultSet
int rowCount = rs.getRow();
// Move the cursor back to the first row
rs.beforeFirst();
// Display the column headers
ResultSetMetaData rsmd = rs.getMetaData();
for (int i = 1; i <= rsmd.getColumnCount(); i++) {
System.out.print(rsmd.getColumnName(i) + "\t");
}
System.out.println();
// Iterate through the ResultSet and display the data
while (rs.next()) {
System.out.print(rs.getInt("TID") + "\t");
System.out.print(rs.getString("TName") + "\t");
System.out.print(rs.getInt("Salary") + "\t");
System.out.println();
}
// Close the ResultSet, Statement, and Connection
rs.close();
stmt.close();
conn.close();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
----------------______--------END---------______---------
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