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Muhammed Magdy

ListSelection > jList1ValueChanged

سؤال

السلام عليكم ورحمة الله وبركاته

 

أحاول في هذا المثال عمل Action لل JList عن طريق ال Drag & Drop ولكن المشكلة لا يقبل أي مصوفة جديدة ولا تعريف المصفوفة في ال Event

public class JList_example extends javax.swing.JFrame {    /**     * Creates new form JList_example     */    public JList_example() {        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">                              private void initComponents() {        jPanel1 = new javax.swing.JPanel();        jScrollPane1 = new javax.swing.JScrollPane();        jList1 = new javax.swing.JList();        jLabel1 = new javax.swing.JLabel();        jPanel1.setLayout(null);        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);        setTitle("JList example");        jList1.setBorder(new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.RAISED));        jList1.setFont(new java.awt.Font("Tahoma", 1, 14)); // NOI18N        jList1.setModel(new javax.swing.AbstractListModel() {            String[] strings = { "Red", "Green", "Blue", "Black", "White", "Yellow" };            public int getSize() { return strings.length; }            public Object getElementAt(int i) { return strings[i]; }        });        jList1.setSelectionMode(javax.swing.ListSelectionModel.SINGLE_SELECTION);        jList1.addListSelectionListener(new javax.swing.event.ListSelectionListener() {            public void valueChanged(javax.swing.event.ListSelectionEvent evt) {                jList1ValueChanged(evt);            }        });        jScrollPane1.setViewportView(jList1);        jLabel1.setFont(new java.awt.Font("Tahoma", 1, 50)); // NOI18N        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());        getContentPane().setLayout(layout);        layout.setHorizontalGroup(            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)            .addGroup(layout.createSequentialGroup()                .addGap(20, 20, 20)                .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)                .addGap(65, 65, 65)                .addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 150, javax.swing.GroupLayout.PREFERRED_SIZE)                .addContainerGap(65, Short.MAX_VALUE))        );        layout.setVerticalGroup(            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)            .addGroup(layout.createSequentialGroup()                .addGap(20, 20, 20)                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)                    .addComponent(jLabel1)                    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))                .addContainerGap(120, Short.MAX_VALUE))        );        layout.linkSize(javax.swing.SwingConstants.VERTICAL, new java.awt.Component[] {jLabel1, jScrollPane1});        pack();        setLocationRelativeTo(null);    }// </editor-fold>                            private void jList1ValueChanged(javax.swing.event.ListSelectionEvent evt) {                                            if (strings)    }                                       /**     * @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 http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html          */        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(JList_example.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);        } catch (InstantiationException ex) {            java.util.logging.Logger.getLogger(JList_example.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);        } catch (IllegalAccessException ex) {            java.util.logging.Logger.getLogger(JList_example.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);        } catch (javax.swing.UnsupportedLookAndFeelException ex) {            java.util.logging.Logger.getLogger(JList_example.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 JList_example().setVisible(true);            }        });    }    // Variables declaration - do not modify                         private javax.swing.JLabel jLabel1;    private javax.swing.JList jList1;    private javax.swing.JPanel jPanel1;    private javax.swing.JScrollPane jScrollPane1;    // End of variables declaration                   }

JList01_zps3611a830.png

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