///===========Clear================= jList1.setListData(new String[]{}); //==============Remove Selected Element ========= // TODO add your handling code here: int count=0; DefaultListModel listModel1 = new DefaultListModel(); ListModel<String> tempL= jList1.getModel(); //Create New Array and add element for(int i=0;i<tempL.getSize();i++){ listModel1.add(i, tempL.getElementAt(i)); } //===Delete From Array for(int index : jList1.getSelectedIndices()){ /// System.out.println(index); //...
🔄 Java Swing JSpinner – Overview & Example JSpinner is a Swing component that allows users to select a number or object value from a sequence by clicking up/down arrows or typing. ✅ Key Features Method / Property Description setModel(SpinnerModel) Set a value model (number, list, date, etc.) getValue() Get current spinner value setValue(Object) Set spinner value addChangeListener(...) Listen to value changes 📦 Types of Spinner Models Spinner Model Description SpinnerNumberModel Integer/double values SpinnerListModel List of strings or objects SpinnerDateModel Dates (with min/max & step size) ✅ Example 1: Spinner with Numbers import javax.swing.*; import java.awt.*; public class NumberSpinnerExample { public static void main(String[] args) { JFrame frame = new JFrame("JSpinner Number Example"); frame.setSize(300, 100); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); ...
🛢️ MySQL Connection & CRUD Operations in Java In this guide, you will learn how to connect Java applications to a MySQL database and perform basic CRUD (Create, Read, Update, Delete) operations using JDBC (Java Database Connectivity). 🔌 1. Setting up MySQL Connector First, download the MySQL Connector/J (JDBC driver) and add the JAR file to your project’s build path or dependencies. 📡 2. Connecting to MySQL Database import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class DBConnection { private static final String URL = "jdbc:mysql://localhost:3306/testdb"; private static final String USER = "root"; private static final String PASSWORD = "your_password"; public static Connection getConnection() { try { return DriverManager.getConnection(URL, USER, PASSWORD); } catch (SQLException e) { System.out.println("Connection Failed!"); e.printStackTrace(); ...
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