Swing example

LINK

You can see this document to understand how to code step by step to make a form by swing on Java Language.

Next step:
http://www.thainetbeans.com/sample/logindemo.htm

MessageDialog to shows the error message.

Here is the code of NextPage.java

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

Here is the code of LoginDemo.java

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());} } }

Output will be displayed as:

Download Source Code