Aplicação criada no NetBeans, usei gráficos. O que ele faz? Este software possui 2 jbuttons, o "Exibir Mensagem" e o "Encerrar", um JtextField e um JLabel.

O JLabel usamos apenas para deixar escrito: "Escreva aqui o seu nome"

O JButton "Exibir Mensagem" exibe o nome digitado (o nome digitado foi ...) e o "Encerrar" obviamente fecha o programa.

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import javax.swing.JOptionPane;
/*
 * TelaPrincipal.java
 *
 * Created on 6 de Setembro de 2009, 17:01
 */

/**
 *
 * @author  Juninho
 */
public class TelaPrincipal extends javax.swing.JFrame {
    
    /** Creates new form TelaPrincipal */
    public TelaPrincipal() {
        initComponents();
    }
    
    /** This method is called from within the constructor to
     * initialize the form.
     * WARNING: Do NOT modify this code. The content of this method is
     * always regenerated by the Form Editor.
     */
    // <editor-fold defaultstate="collapsed" desc=" Generated Code ">                          
    private void initComponents() {
        txNome = new javax.swing.JTextField();
        lbPreencha = new javax.swing.JLabel();
        btMensagem = new javax.swing.JButton();
        btEncerrar = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Usando o NetBeans :)");

        lbPreencha.setFont(new java.awt.Font("MS Sans Serif", 1, 11));
        lbPreencha.setText("Digite seu nome ");

        btMensagem.setText("Exibir Mensagem");
        btMensagem.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btMensagemActionPerformed(evt);
            }
        });

        btEncerrar.setText("Encerrar");
        btEncerrar.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                btEncerrarActionPerformed(evt);
            }
        });

        org.jdesktop.layout.GroupLayout layout = new org.jdesktop.layout.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
                    .add(layout.createSequentialGroup()
                        .addContainerGap()
                        .add(txNome, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 278, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE))
                    .add(layout.createSequentialGroup()
                        .add(38, 38, 38)
                        .add(lbPreencha))
                    .add(layout.createSequentialGroup()
                        .addContainerGap()
                        .add(btMensagem, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, 197, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                        .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                        .add(btEncerrar)))
                .addContainerGap(36, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(org.jdesktop.layout.GroupLayout.LEADING)
            .add(layout.createSequentialGroup()
                .add(lbPreencha)
                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                .add(txNome, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE, org.jdesktop.layout.GroupLayout.DEFAULT_SIZE, org.jdesktop.layout.GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(org.jdesktop.layout.LayoutStyle.RELATED)
                .add(layout.createParallelGroup(org.jdesktop.layout.GroupLayout.BASELINE)
                    .add(btMensagem)
                    .add(btEncerrar))
                .addContainerGap(33, Short.MAX_VALUE))
        );
        pack();
    }// </editor-fold>                        

    private void btEncerrarActionPerformed(java.awt.event.ActionEvent evt) {                                           
// TODO add your handling code here:
        System.exit(0);
    }                                          

    private void btMensagemActionPerformed(java.awt.event.ActionEvent evt) {                                           
// TODO add your handling code here:
        JOptionPane.showMessageDialog(null,
                "O nome digitado foi : "+ txNome.getText(),
                "Mensagem",
                JOptionPane.INFORMATION_MESSAGE);
    }                                          
    
    /**
     * @param args the command line arguments
     */
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new TelaPrincipal().setVisible(true);
            }
        });
    }
    
    // Variables declaration - do not modify                     
    private javax.swing.JButton btEncerrar;
    private javax.swing.JButton btMensagem;
    private javax.swing.JLabel lbPreencha;
    private javax.swing.JTextField txNome;
    // End of variables declaration                   
    
}

Expoente

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