dialogwindow.java

这是一个java程序

import java.awt.*;
import java.awt.event.*;

public class DialogWindow extends Frame implements ActionListener
{
    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)
			{
				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.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);

		addWindowListener(new WindowAdapter() {
			public void windowClosing(WindowEvent e)
			{
				field.selectAll();
				setVisible(false);
			}
		});

		//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);
    }
}