Q1]

public class Main extends Thread
{
char c;
public void run()
{
for(c = 'A'; c<='Z';c++)
{
System.out.println(""+c);
try

{
Thread.sleep(3000);
}
catch(Exception e)
{
e.printStackTrace();
}
}
}
public static void main(String args[])
{
Main t = new Main();
t.start();
}
}

Q2]


import javax.swing.*;
import java.awt.event.*;
import java.sql.*;

public class EmployeeDetailsForm extends JFrame implements ActionListener {
    JLabel label1, label2, label3, label4;
    JTextField textField1, textField2, textField3, textField4;
    JButton button;
    
    public EmployeeDetailsForm() {
        label1 = new JLabel("Employee Number:");
        label1.setBounds(50, 50, 150, 20);
        
        label2 = new JLabel("Employee Name:");
        label2.setBounds(50, 80, 150, 20);
        
        label3 = new JLabel("Designation:");
        label3.setBounds(50, 110, 150, 20);
        
        label4 = new JLabel("Salary:");
        label4.setBounds(50, 140, 150, 20);
        
        textField1 = new JTextField();
        textField1.setBounds(200, 50, 150, 20);
        
        textField2 = new JTextField();
        textField2.setBounds(200, 80, 150, 20);
        
        textField3 = new JTextField();
        textField3.setBounds(200, 110, 150, 20);
        
        textField4 = new JTextField();
        textField4.setBounds(200, 140, 150, 20);
        
        button = new JButton("Submit");
        button.setBounds(150, 180, 100, 30);
        button.addActionListener(this);
        
        add(label1);
        add(label2);
        add(label3);
        add(label4);
        add(textField1);
        add(textField2);
        add(textField3);
        add(textField4);
        add(button);
        
        setSize(400, 300);
        setLayout(null);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
    
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == button) {
            String eno = textField1.getText();
            String ename = textField2.getText();
            String designation = textField3.getText();
            String salary = textField4.getText();
            
            try {
                Connection con = DriverManager.getConnection("jdbc:postgresql:database-name:postgres:password);
                PreparedStatement stmt = con.prepareStatement("INSERT INTO employee (eno, ename, designation, salary) VALUES (?, ?, ?, ?)");
                stmt.setString(1, eno);
                stmt.setString(2, ename);
                stmt.setString(3, designation);
                stmt.setString(4, salary);
                
                int rowsAffected = stmt.executeUpdate();
                if (rowsAffected > 0) {
                    JOptionPane.showMessageDialog(this, "Employee details added successfully!");
                    textField1.setText("");
                    textField2.setText("");
                    textField3.setText("");
                    textField4.setText("");
                } else {
                    JOptionPane.showMessageDialog(this, "Failed to add employee details!");
                }
                
                con.close();
            } catch (Exception ex) {
                JOptionPane.showMessageDialog(this, "Error: " + ex.getMessage());
            }
        }
    }
    
    public static void main(String[] args) {
        new EmployeeDetailsForm();
    }
}