visual basic 6.0 barcode generator The actionSend( ) Method in Java

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The actionSend( ) Method
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The actionSend( ) method, shown here, confirms that all the message fields have been entered and then disposes the dialog box when the Send button is clicked:
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// Validate message fields and close dialog box. private void actionSend() { if (fromTextField.getText().trim().length() < 1
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|| toTextField.getText().trim().length() < 1 || subjectTextField.getText().trim().length() < 1 || contentTextArea.getText().trim().length() < 1) { JOptionPane.showMessageDialog(this, "One or more fields is missing.", "Missing Field(s)", JOptionPane.ERROR_MESSAGE); return; } // Close dialog box. dispose(); }
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Each of the Message dialog box s fields are required, thus actionSend( ) verifies that all the fields have been entered before completing successfully. If one or more fields have not been entered, an error dialog box is displayed to notify the user. Once all the field validations are successful, the dispose( ) method is called to close the dialog box window.
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The actionCancel( ) Method
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The actionCancel( ) method, shown here, is called when the Cancel button in the dialog box is clicked or when the dialog box is closed:
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// Cancel creation of this message and close dialog box. private void actionCancel() { cancelled = true; // Close dialog box. dispose(); }
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Before closing the dialog box with a call to dispose( ), the actionCancel( ) method sets the cancelled flag to true. The cancelled flag is used by the display( ) method to determine if the dialog box has been cancelled.
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The display( ) Method
Normally, a dialog box is displayed on the screen by calling its show( ) method. However, in the case of the Message dialog box, it is essential to know whether or not the dialog box was cancelled when it was disposed. The display( ) method, shown here, does just that, acting as a proxy for the show( ) method:
// Show dialog box. public boolean display() { show(); // Return whether or not display was successful.
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return !cancelled; }
Notice that the inverse of the cancelled flag is returned to indicate whether the display( ) method was successful or not.
Accessor Methods
The MessageDialog class has a number of accessor methods for retrieving the message properties entered in the dialog box. Each of the getFrom( ), getTo( ), getSubject( ), and getContent( ) methods simply returns the value entered into its corresponding control.
The MessagesTableModel Class
The MessagesTableModel class houses E-mail Client s list of messages and is the backing data source for the Messages JTable instance. The MessagesTableModel class is shown here. Notice that it extends AbstractTableModel:
import import import import java.util.*; javax.mail.*; javax.swing.*; javax.swing.table.*;
// This class manages the e-mail table's data. public class MessagesTableModel extends AbstractTableModel { // These are the names for the table's columns. private static final String[] columnNames = {"Sender", "Subject", "Date"}; // The table's list of messages. private ArrayList messageList = new ArrayList(); // Sets the table's list of messages. public void setMessages(Message[] messages) { for (int i = messages.length - 1; i >= 0; i--) { messageList.add(messages[i]); } // Fire table data change notification to table. fireTableDataChanged(); } // Get a message for the specified row. public Message getMessage(int row) { return (Message) messageList.get(row);
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} // Remove a message from the list. public void deleteMessage(int row) { messageList.remove(row); // Fire table row deletion notification to table. fireTableRowsDeleted(row, row); } // Get table's column count. public int getColumnCount() { return columnNames.length; } // Get a column's name. public String getColumnName(int col) { return columnNames[col]; } // Get table's row count. public int getRowCount() { return messageList.size(); } // Get value for a specific row and column combination. public Object getValueAt(int row, int col) { try { Message message = (Message) messageList.get(row); switch (col) { case 0: // Sender Address[] senders = message.getFrom(); if (senders != null || senders.length > 0) { return senders[0].toString(); } else { return "[none]"; } case 1: // Subject String subject = message.getSubject(); if (subject != null && subject.length() > 0) { return subject; } else { return "[none]"; } case 2: // Date
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