Login From (with Swing) in Java


In the LoginDemo.java, we have create two text fields text1 and text2 to set the text for username and password. A button is created to perform an action. The method text1.getText() get the text of username and the method text2.getText() get the text of password which the user enters. Then we have create a condition that if the value of text1 and text2 is roseindia, the user will enter into the next page on clicking the submit button. The NextPage.java is created to move the user to the next page. In case if the user enters the invalid username and password , the class JOptionPane provides the MessageDialog to shows the error message.


 


import javax.swing.*;
import java.awt.*;
  
class NextPage extends JFrame
 {
   NextPage()
  {
  setDefaultCloseOperation(javax.swing.
   WindowConstants.DISPOSE_ON_CLOSE);
  setTitle("Welcome");
  setSize(400, 200);
   }
  }


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
  
class Login extends JFrame implements ActionListener
 {
  JButton SUBMIT;
  JPanel panel;
  JLabel label1,label2;
  final JTextField  text1,text2;
   Login()
   {
   label1 = new JLabel();
   label1.setText("Username:");
   text1 = new JTextField(15);

   label2 = new JLabel();
   label2.setText("Password:");
   text2 = new JPasswordField(15);
  
   SUBMIT=new JButton("SUBMIT");
   
   panel=new JPanel(new GridLayout(3,1));
   panel.add(label1);
   panel.add(text1);
   panel.add(label2);
   panel.add(text2);
   panel.add(SUBMIT);
   add(panel,BorderLayout.CENTER);
   SUBMIT.addActionListener(this);
   setTitle("LOGIN FORM");
   }
  public void actionPerformed(ActionEvent ae)
   {
   String value1=text1.getText();
   String value2=text2.getText();
   if (value1.equals("roseindia") && value2.equals("roseindia")) {
   NextPage page=new NextPage();
   page.setVisible(true);
   JLabel label = new JLabel("Welcome:"+value1);
   page.getContentPane().add(label);
   }
   else{
   System.out.println("enter the valid username and password");
   JOptionPane.showMessageDialog(this,"Incorrect login or password",
   "Error",JOptionPane.ERROR_MESSAGE);
   }
 }
 }
  class LoginDemo
 {
   public static void main(String arg[])
   {
   try
   {
   Login frame=new Login();
   frame.setSize(300,100);
   frame.setVisible(true);
   }
   catch(Exception e)
   {JOptionPane.showMessageDialog(null, e.getMessage());}
   }
 }