Comunque io sto appena iniziando ad imparare java quindi ancora non so bene cosa sto scrivendo...se ho capito bene il costruttore dovrebbe essere questo:
codice:
public class ProvaSwing extends javax.swing.JFrame
ma mi sbaglierò senz'altro...
se cosi è più chiaro il codice...!
codice:
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.JButton; public class ProvaSwing extends javax.swing.JFrame { private void initComponents() { jButton1 = new javax.swing.JButton(); jLabel1 = new javax.swing.JLabel(); setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE); jButton1.setText("Premi qui"); jButton1.addActionListener(new java.awt.event.ActionListener() { public void actionPerformed(java.awt.event.ActionEvent evt) { jButton1ActionPerformed(evt); } }); jLabel1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0))); javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane()); getContentPane().setLayout(layout); layout.setHorizontalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addContainerGap() .addComponent(jButton1) .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED) .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 212, javax.swing.GroupLayout.PREFERRED_SIZE) .addContainerGap(99, Short.MAX_VALUE)) ); layout.setVerticalGroup( layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addGroup(layout.createSequentialGroup() .addGap(26, 26, 26) .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING) .addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, 23, Short.MAX_VALUE) .addComponent(jButton1)) .addGap(251, 251, 251)) ); pack(); }// </editor-fold> private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) { JButton pulsante=new JButton("Premi qui"); pulsante.setMnemonic('D'); pulsante.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { etichetta.settext("Bravo ce l'hai fatta"); } }); } /** * @param args the command line arguments */ public static void main(String args[]) { java.awt.EventQueue.invokeLater(new Runnable() { public void run() { new ProvaSwing().setVisible(true); } }); } // Variables declaration - do not modify private javax.swing.JButton jButton1; private javax.swing.JLabel jLabel1; // End of variables declaration }