corejava第10版

corejava第10版/v1ch12/dataExchange/DataExchangeFrame.java

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+package dataExchange;
+
+import java.awt.*;
+import java.awt.event.*;
+import javax.swing.*;
+
+/**
+ * A frame with a menu whose File->Connect action shows a password dialog.
+ */
+public class DataExchangeFrame extends JFrame
+{
+   public static final int TEXT_ROWS = 20;
+   public static final int TEXT_COLUMNS = 40;
+   private PasswordChooser dialog = null;
+   private JTextArea textArea;
+
+   public DataExchangeFrame()
+   {
+      // construct a File menu
+
+      JMenuBar mbar = new JMenuBar();
+      setJMenuBar(mbar);
+      JMenu fileMenu = new JMenu("File");
+      mbar.add(fileMenu);
+
+      // add Connect and Exit menu items
+
+      JMenuItem connectItem = new JMenuItem("Connect");
+      connectItem.addActionListener(new ConnectAction());
+      fileMenu.add(connectItem);
+
+      // The Exit item exits the program
+
+      JMenuItem exitItem = new JMenuItem("Exit");
+      exitItem.addActionListener(event -> System.exit(0));
+      fileMenu.add(exitItem);
+
+      textArea = new JTextArea(TEXT_ROWS, TEXT_COLUMNS);
+      add(new JScrollPane(textArea), BorderLayout.CENTER);
+      pack();
+   }
+
+   /**
+    * The Connect action pops up the password dialog.
+    */
+   private class ConnectAction implements ActionListener
+   {
+      public void actionPerformed(ActionEvent event)
+      {
+         // if first time, construct dialog
+
+         if (dialog == null) dialog = new PasswordChooser();
+
+         // set default values
+         dialog.setUser(new User("yourname", null));
+
+         // pop up dialog
+         if (dialog.showDialog(DataExchangeFrame.this, "Connect"))
+         {
+            // if accepted, retrieve user input
+            User u = dialog.getUser();
+            textArea.append("user name = " + u.getName() + ", password = "
+                  + (new String(u.getPassword())) + "\n");
+         }
+      }
+   }
+}