Name: joT67522 Date: 12/12/97


I've found PrintJob in v1.1.5 to be buggier
than the one in v1.1.4. For example:
(1) it won't print a simple Frame with 3 Buttons
correctly.
(2) it won't print a Canvas at all (gives a
Java.Lang.NullPointerException).
Please run the following program:

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

class MainFrame extends Frame implements ActionListener
{
    Button printWindowButton = new Button("PrintWindow");
    Button printCanvasButton = new Button("PrintCanvas");
    Button exitButton = new Button("Exit");
    
    public static void
    main (String argv[])
    {
        new MainFrame ();
    }

    public
    MainFrame ()
    {
        super ("PrintTest");
        
        setLayout(new FlowLayout());
        add(printWindowButton);
        add(printCanvasButton);
        add(exitButton);
        
        printWindowButton.addActionListener(this);
        printCanvasButton.addActionListener(this);
        exitButton.addActionListener(this);
        
        pack();
        show();
    }
    
    public void
    actionPerformed (ActionEvent e)
    {
        if (e.getSource() == exitButton)
        {
            setVisible (false);
            dispose ();
            System.exit (0);
        }
        else if (e.getSource() == printWindowButton)
        {
            PrintJob pjob = getToolkit().getPrintJob(this,"PrintWindow",null);
            if (pjob == null) return;
            Graphics pgraphics = pjob.getGraphics();
            if (pgraphics == null) return;
            printAll (pgraphics);
            pgraphics.dispose();
            pjob.end();
        }
        else if (e.getSource() == printCanvasButton)
        {
            PrintJob pjob = getToolkit().getPrintJob(this,"PrintCanvas",null);
            if (pjob == null) return;
            Graphics pgraphics = pjob.getGraphics();
            if (pgraphics == null) return;
            PrintCanvas pCanvas = new PrintCanvas();
            pCanvas.paint(pgraphics);
            pgraphics.dispose();
            pjob.end();
        }
    }
}

class PrintCanvas extends Canvas
{
    public
    PrintCanvas ()
    {
        super();
    }
    
    public void
    paint (Graphics g)
    {
        g.drawString ("Hello Cruel World.", 50, 50);
    }
}
(Review ID: 21825)
======================================================================