Не работает слушатель клавиатуры на java gui
Формулировка задачи:
Здравствуйте,почему не работает этот код с GUI.Хочу повесить на кнопку jButton1 слушатель addKeyListener(),чтобы по нажатию
по <Enter> вычислялась сумма полей(int числа).При нажатию не происходит ничего.
Здесь часть часть кода вырезана,где идет расположение компонентов т.к форму делал в NetBeans.addKeyListener() на jButton1 добавлял в far редакторе.
Листинг программы
- import javax.swing.JOptionPane;
- public class NewJFrame extends javax.swing.JFrame {
- /**
- * Creates new form NewJFrame
- */
- public NewJFrame() {
- 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.
- */
- @SuppressWarnings("unchecked")
- // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
- private void initComponents() {
- jTextField1 = new javax.swing.JTextField();
- jLabel1 = new javax.swing.JLabel();
- jTextField2 = new javax.swing.JTextField();
- jButton1 = new javax.swing.JButton();
- jLabel2 = new javax.swing.JLabel();
- setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
- jTextField1.setText(" ");
- jLabel1.setText("+");
- jTextField2.setText(" ");
- jButton1.setText("jButton1");
- /*jButton1.addActionListener(new java.awt.event.ActionListener() {
- public void actionPerformed(java.awt.event.ActionEvent evt) {
- jButton1ActionPerformed(evt);
- }
- });*/
- jButton1.addKeyListener(new java.awt.event.KeyAdapter() {
- public void keyPressed(java.awt.event.KeyEvent evt){
- formKeyPressed(evt);
- }
- });
- jLabel2.setText(" ");
- }// </editor-fold>//GEN-END:initComponents
- private void jButton1ActionPerformed(java.awt.event.KeyEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
- int i=0;int j=0;
- try{
- i=Integer.parseInt(jTextField1.getText());
- j=Integer.parseInt(jTextField2.getText());
- Integer d=i+j;
- jLabel2.setText(d.toString());
- }catch(Exception ex){
- JOptionPane.showMessageDialog(null,"Введите целое число.");
- }//
- }//GEN-LAST:event_jButton1ActionPerformed
- }
- private void formKeyPressed(java.awt.event.KeyEvent evt){
- switch(evt.getKeyCode()){
- case java.awt.event.KeyEvent.VK_ENTER:
- jButton1ActionPerformed(evt);
- break;
- default:
- }
- }
- /**
- * @param args the command line arguments
- */
- public static void main(String args[]) {
- /* Create and display the form */
- java.awt.EventQueue.invokeLater(new Runnable() {
- public void run() {
- new NewJFrame().setVisible(true);
- }
- });
- }
- // Variables declaration - do not modify//GEN-BEGIN:variables
- private javax.swing.JButton jButton1;
- private javax.swing.JLabel jLabel1;
- private javax.swing.JLabel jLabel2;
- private javax.swing.JTextField jTextField1;
- private javax.swing.JTextField jTextField2;
- // End of variables declaration//GEN-END:variables
- }
Решение задачи: «Не работает слушатель клавиатуры на java gui»
textual
Листинг программы
- import javax.swing.JOptionPane;
- public class NewJFrame extends javax.swing.JFrame {
- /**
- * Creates new form NewJFrame
- */
- public NewJFrame() {
- initComponents();
- jButton1.addKeyListener(new java.awt.event.KeyAdapter() {
- public void keyPressed(java.awt.event.KeyEvent evt){
- formKeyPressed(evt);
- }
- });
- }
- /**
- * 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.
- */
- @SuppressWarnings("unchecked")
- // <editor-fold defaultstate="collapsed" desc="Generated Code">//GEN-BEGIN:initComponents
- private void initComponents() {
- jTextField1 = new javax.swing.JTextField();
- jLabel1 = new javax.swing.JLabel();
- jTextField2 = new javax.swing.JTextField();
- jButton1 = new javax.swing.JButton();
- jLabel2 = new javax.swing.JLabel();
- setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
- jTextField1.setText(" ");
- jLabel1.setText("+");
- jTextField2.setText(" ");
- jButton1.setText("jButton1");
- /*jButton1.addActionListener(new java.awt.event.ActionListener() {
- public void actionPerformed(java.awt.event.ActionEvent evt) {
- jButton1ActionPerformed(evt);
- }
- });*/
- jLabel2.setText(" ");
- 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()
- .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
- .addGroup(layout.createSequentialGroup()
- .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 90, javax.swing.GroupLayout.PREFERRED_SIZE)
- .addGap(18, 18, 18)
- .addComponent(jLabel1)
- .addGap(18, 18, 18)
- .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 94, javax.swing.GroupLayout.PREFERRED_SIZE))
- .addComponent(jButton1)
- .addComponent(jLabel2))
- .addContainerGap(162, Short.MAX_VALUE))
- );
- layout.setVerticalGroup(
- layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
- .addGroup(layout.createSequentialGroup()
- .addContainerGap()
- .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
- .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
- .addComponent(jLabel1)
- .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
- .addGap(18, 18, 18)
- .addComponent(jButton1)
- .addGap(18, 18, 18)
- .addComponent(jLabel2)
- .addContainerGap(196, Short.MAX_VALUE))
- );
- pack();
- }// </editor-fold>//GEN-END:initComponents
- private void jButton1ActionPerformed(java.awt.event.KeyEvent evt) {//GEN-FIRST:event_jButton1ActionPerformed
- Integer i=0, j=0;
- try{
- i=Integer.parseInt(jTextField1.getText());
- j=Integer.parseInt(jTextField2.getText());
- Integer d=i+j;
- jLabel2.setText(d.toString());
- }catch(Exception ex){
- JOptionPane.showMessageDialog(null,"Введите целое число!");
- }// }//GEN-LAST:event_jButton1ActionPerformed
- }
- private void formKeyPressed(java.awt.event.KeyEvent evt){
- switch(evt.getKeyCode()){
- case java.awt.event.KeyEvent.VK_ENTER:
- jButton1ActionPerformed(evt);
- //System.out.println("ku-ku!");
- break;
- default:
- }
- }
- /**
- * @param args the command line arguments
- */
- public static void main(String args[]) {
- /* Set the Nimbus look and feel */
- //<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
- /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
- * For details see [url]http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html[/url]
- */
- try {
- for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
- if ("Nimbus".equals(info.getName())) {
- javax.swing.UIManager.setLookAndFeel(info.getClassName());
- break;
- }
- }
- } catch (ClassNotFoundException ex) {
- java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
- } catch (InstantiationException ex) {
- java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
- } catch (IllegalAccessException ex) {
- java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
- } catch (javax.swing.UnsupportedLookAndFeelException ex) {
- java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
- }
- //</editor-fold>
- /* Create and display the form */
- java.awt.EventQueue.invokeLater(new Runnable() {
- public void run() {
- new NewJFrame().setVisible(true);
- }
- });
- }
- // Variables declaration - do not modify//GEN-BEGIN:variables
- private javax.swing.JButton jButton1;
- private javax.swing.JLabel jLabel1;
- private javax.swing.JLabel jLabel2;
- private javax.swing.JTextField jTextField1;
- private javax.swing.JTextField jTextField2;
- // End of variables declaration//GEN-END:variables
- }
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