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Код


public class NewJDialog extends javax.swing.JDialog {
    public NewJDialog(java.awt.Frame parent, boolean modal) {
        super(parent, modal);
        initComponents();
    }

    private void initComponents() {
        jScrollPane1 = new javax.swing.JScrollPane();
        jTextArea1 = new javax.swing.JTextArea();

        setDefaultCloseOperation(javax.swing.WindowConstants.DISPOSE_ON_CLOSE);
        jTextArea1.setColumns(20);
        jTextArea1.setRows(5);
        jScrollPane1.setViewportView(jTextArea1);

        getContentPane().add(jScrollPane1, java.awt.BorderLayout.CENTER);

        pack();
    }
       
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTextArea jTextArea1;
}

Код


public class NewJFrame extends javax.swing.JFrame {
    
    public NewJFrame() {
        initComponents();
    }
    
    private void initComponents() {
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();

        getContentPane().setLayout(new java.awt.GridLayout());

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        jButton1.setText("with BUG");
        jButton1.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton1MouseClicked(evt);
            }
        });

        getContentPane().add(jButton1);

        jButton2.setText("without BUG");
        jButton2.addMouseListener(new java.awt.event.MouseAdapter() {
            public void mouseClicked(java.awt.event.MouseEvent evt) {
                jButton2MouseClicked(evt);
            }
        });

        getContentPane().add(jButton2);

        pack();
    }
    
    private void jButton2MouseClicked(java.awt.event.MouseEvent evt) {
        NewJDialog njd = new NewJDialog(this, true);
        njd.setVisible(true);
    }
    
    private void jButton1MouseClicked(java.awt.event.MouseEvent evt) {                                      
        NewJDialog njd = new NewJDialog(null, true);
        njd.setVisible(true);
    }                                     
    
    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new NewJFrame().setVisible(true);
            }
        });
    }
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
}