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答案：import java.awt.*;

import java.awt.event.*;

 

public class DialogWindow extends Frame implements ActionListener {

    boolean inAnApplet = true; //should be private 

    private SimpleDialog dialog;

    private TextArea textArea;

    String newline;

 

    public DialogWindow() {

        textArea = new TextArea(5, 40);

        textArea.setEditable(false);

        add("Center", textArea);

        Button button = new Button("Click to bring up dialog");

        button.addActionListener(this);

       Panel panel = new Panel();

        panel.add(button);

        add("South", panel);

 

        addWindowListener(new WindowAdapter() {

           public void windowClosing(WindowEvent e) {

               if (inAnApplet) {

                   setVisible(false);

                   dispose();

               } else {

                   System.exit(0);

               }

           }

       });

 

        newline = System.getProperty("line.separator");

    }

 

    public void actionPerformed(ActionEvent event) {

       if (dialog == null) {

           dialog = new SimpleDialog(this, "A Simple Dialog");

       }

        dialog.setVisible(true);

    }

 

    public void setText(String text) {

        textArea.append(text + newline);

    }

 

    public static void main(String args[]) {

        DialogWindow window = new DialogWindow();

        window.inAnApplet = false;

 

        window.setTitle("DialogWindow Application");

        window.pack();

        window.setVisible(true);

    }

}

 

class SimpleDialog extends Dialog implements ActionListener {

    TextField field;

    DialogWindow parent;

    Button setButton;

 

    SimpleDialog(Frame dw, String title) {

       super(dw, title, false);

        parent = (DialogWindow) dw;

 

        //Create middle section.

       Panel p1 = new Panel();

       Label label = new Label("Enter random text here:");

        p1.add(label);

       field = new TextField(40);

        field.addActionListener(this);

        p1.add(field);

        add("Center", p1);

 

        //Create bottom row.

       Panel p2 = new Panel();

        p2.setLayout(new FlowLayout(FlowLayout.RIGHT));

        Button b = new Button("Cancel");

        b.addActionListener(this);

        setButton = new Button("Set");

        setButton.addActionListener(this);

        p2.add(b);

        p2.add(setButton);

        add("South", p2);

 

        //Initialize this dialog to its preferred size.

        pack();

    }

 

    public void actionPerformed(ActionEvent event) {

        Object source = event.getSource();

       if ((source == setButton) | (source == field)) {

           parent.setText(field.getText());

       }

        field.selectAll();

        setVisible(false);

    }

}

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