[cable]

-Can you interpret the following compile errors from 2 .java files ?
——————————————————————————
Severity Description Resource In Folder Location Creation Time
2 The type MainFrame must implement the inherited abstract method AppletContext.getStream(String) MainFrame.java sfkorean/src/Acme
2 The type MainFrame must implement the inherited abstract method AppletContext.getStreamKeys() MainFrame.java sfkorean/src/Acme
2 The type MainFrame must implement the inherited abstract method AppletContext.setStream(String, InputStream) MainFrame.java sfkorean/src/Acme
==========================================================
2 The type StubToolkit must implement the inherited abstract method Toolkit.createDragSourceContextPeer(DragGestureEvent) StubToolkit.java sfkorean/src/Acme/JPM
2 The type StubToolkit must implement the inherited abstract method Toolkit.createImage(String) StubToolkit.java sfkorean/src/Acme/JPM
2 The type StubToolkit must implement the inherited abstract method Toolkit.createImage(URL) StubToolkit.java sfkorean/src/Acme/JPM
2 The type StubToolkit must implement the inherited abstract method Toolkit.mapInputMethodHighlight(InputMethodHighlight) StubToolkit.java sfkorean/src/Acme/JPM
2 Cannot reduce the visibility of the inherited method from Image StubToolkit.java sfkorean/src/Acme/JPM
2 The type StubGraphics must implement the inherited abstract method Graphics.drawString(AttributedCharacterIterator, int, int) StubToolkit.java sfkorean/src/Acme/JPM
—————————————————————————-
windows xp used, C:\Java\eclipse\plugins 252 objects are shown, Eclipse 3.1M6,Myeclipse workbench 3.8.4 , j2sdk1.4.2_08, J2EE1.4 installed.
The two .java codes are as follows.
[/code]

** 1St code: Mainframe.java code
——————————————————-
// MainFrame – run an Applet as an application
//

package Acme;

import java.applet.*;
import java.awt.*;
import java.awt.image.*;
import java.net.*;
import java.io.*;
import java.util.*;

/// Run an Applet as an application.
// <P>
// Using this class you can add a trivial main program to any Applet
// and run it directly, as well as from a browser or the appletviewer.
// And unlike some versions of this concept, MainFrame implements both
// images and sound.
// <P>
// Sample main program:
// <BLOCKQUOTE>

// public static void main( String[] args )

// {

// new Acme.MainFrame( new ThisApplet(), args, 400, 400 );

// }

//
</BLOCKQUOTE>
// The only methods you need to know about are the constructors.
// <P>
// You can specify Applet parameters on the command line, as name=value.
// For instance, the equivalent of:
// <BLOCKQUOTE>

// <PARAM NAME=”pause” VALUE=”200″>

//
</BLOCKQUOTE>
// would just be:
// <BLOCKQUOTE>

// pause=200

//
</BLOCKQUOTE>
// You can also specify three special parameters:
// <BLOCKQUOTE>

// width=N Width of the Applet.

// height=N Height of the Applet.

// barebones=true Leave off the menu bar and status area.

//
</BLOCKQUOTE>
// <P>
// <A HREF=”/resources/classes/Acme/MainFrame.java”>Fetch the software.</A><BR>
// <A HREF=”/resources/classes/Acme.tar.gz”>Fetch the entire Acme package.</A>

public class MainFrame extends Frame
implements Runnable, AppletStub, AppletContext
{

private String[] args = null;
private static int instances = 0;
private String name;
private boolean barebones = false;
private Applet applet;
private Label label = null;
private Dimension appletSize;

private static final String PARAM_PROP_PREFIX = “parameter.”;

/// Constructor with everything specified.
public MainFrame(
Applet applet, String[] args, int width, int height )
{
build( applet, args, width, height );
}

/// Constructor with no default width/height.
public MainFrame( Applet applet, String[] args )
{
build( applet, args, -1, -1 );
}

/// Constructor with no arg parsing.
public MainFrame( Applet applet, int width, int height )
{
build( applet, null, width, height );
}

// Internal constructor routine.
private void build(
Applet applet, String[] args, int width, int height )
{
++instances;
this.applet = applet;
this.args = args;
applet.setStub( this );
name = applet.getClass().getName();
setTitle( name );

// Set up properties.
Properties props = System.getProperties();
props.put( “browser”, “Acme.MainFrame” );
props.put( “browser.version”, “11jul96” );
props.put( “browser.vendor”, “Acme Laboratories” );
props.put( “browser.vendor.url”, “http://www.acme.com/&#8221; );

// Turn args into parameters by way of the properties list.
if ( args != null )
parseArgs( args, props );

// If width and height are specified in the parameters, override
// the compiled-in values.
String widthStr = getParameter( “width” );
if ( widthStr != null )
width = Integer.parseInt( widthStr );
String heightStr = getParameter( “height” );
if ( heightStr != null )
height = Integer.parseInt( heightStr );

// Were width and height specified somewhere?
if ( width == -1 || height == -1 )
{
System.err.println( “Width and height must be specified.” );
return;
}

// Do we want to run bare-bones?
String bonesStr = getParameter( “barebones” );
if ( bonesStr != null && bonesStr.equals( “true” ) )
barebones = true;

if ( ! barebones )
{
// Make menu bar.
MenuBar mb = new MenuBar();
Menu m = new Menu( “Applet” );
m.add( new MenuItem( “Restart” ) );
m.add( new MenuItem( “Clone” ) );
m.add( new MenuItem( “Close” ) );
m.add( new MenuItem( “Quit” ) );
mb.add( m );
setMenuBar( mb );
}

// Lay out components.
setLayout( new BorderLayout() );
add( “Center”, applet );
if ( ! barebones )
{
Panel borderPanel =
new Acme.Widgets.BorderPanel( Acme.Widgets.BorderPanel.RAISED );
borderPanel.setLayout( new BorderLayout() );
label = new Label( “” );
borderPanel.add( “Center”, label );
add( “South”, borderPanel );
}

// Set up size.
pack();
validate();
appletSize = applet.size();
// appletSize = applet.getSize();
applet.resize( width, height );
// applet.setSize( width, height );
show();

// Start a separate thread to call the applet’s init() and start()
// methods, in case they take a long time.
(new Thread( this )).start();
}

// Turn command-line arguments into Applet parameters, by way of the
// properties list.
private static void parseArgs( String[] args, Properties props )
{
for ( int i = 0; i < args.length; ++i )
{
String arg = args[i];
int ind = arg.indexOf( ‘=’ );
if ( ind == -1 )
props.put( PARAM_PROP_PREFIX + arg.toLowerCase(), “” );
else
props.put(
PARAM_PROP_PREFIX + arg.substring( 0, ind ).toLowerCase(),
arg.substring( ind + 1 ) );
}
}

/// Event handler for the menu bar.
public boolean handleEvent( Event evt )
{
switch ( evt.id )
{
case Event.ACTION_EVENT:
if ( evt.arg.equals( “Restart” ) )
{
applet.stop();
applet.destroy();
Thread thread = new Thread( this );
thread.start();
}
else if ( evt.arg.equals( “Clone” ) )
{
try
{
new MainFrame(
(Applet) applet.getClass().newInstance(), args,
appletSize.width, appletSize.height );
}
catch ( IllegalAccessException e )
{
showStatus( e.getMessage() );
}
catch ( InstantiationException e )
{
showStatus( e.getMessage() );
}
}
else if ( evt.arg.equals( “Close” ) )
{
setVisible( false );
remove( applet );
applet.stop();
applet.destroy();
if ( label != null )
remove( label );
dispose();
–instances;
if ( instances == 0 )
System.exit( 0 );
}
else if ( evt.arg.equals( “Quit” ) )
System.exit( 0 );
break;

case Event.WINDOW_DESTROY:
System.exit( 0 );
break;
}
return super.handleEvent( evt );
}

// Methods from Runnable.

/// Separate thread to call the applet’s init() and start() methods.
public void run()
{
showStatus( name + ” initializing…” );
applet.init();
validate();
showStatus( name + ” starting…” );
applet.start();
validate();
showStatus( name + ” running…” );
}

// Methods from AppletStub.

public boolean isActive()
{
return true;
}

public URL getDocumentBase()
{
// Returns the current directory.
String dir = System.getProperty( “user.dir” );
String urlDir = dir.replace( File.separatorChar, ‘/’ );
try
{
return new URL( “file:” + urlDir + “/”);
}
catch ( MalformedURLException e )
{
return null;
}
}

public URL getCodeBase()
{
// Hack: loop through each item in CLASSPATH, checking if
// the appropriately named .class file exists there. But
// this doesn’t account for .zip files.
String path = System.getProperty( “java.class.path” );
Enumeration st = new StringTokenizer( path, “:” );
while ( st.hasMoreElements() )
{
String dir = (String) st.nextElement();
String filename = dir + File.separatorChar + name + “.class”;
File file = new File( filename );
if ( file.exists() )
{
String urlDir = dir.replace( File.separatorChar, ‘/’ );
try
{
return new URL( “file:” + urlDir + “/” );
}
catch ( MalformedURLException e )
{
return null;
}
}
}
return null;
}

public String getParameter( String name )
{
// Return a parameter via the munged names in the properties list.
return System.getProperty( PARAM_PROP_PREFIX + name.toLowerCase() );
}

public void appletResize( int width, int height )
{
// Change the frame’s size by the same amount that the applet’s
// size is changing.
Dimension frameSize = size();
// Dimension frameSize = getSize();
frameSize.width += width – appletSize.width;
frameSize.height += height – appletSize.height;
resize( frameSize );
// setSize( frameSize );
appletSize = applet.size();
// appletSize = applet.getSize();
}

public AppletContext getAppletContext()
{
return this;
}

// Methods from AppletContext.

public AudioClip getAudioClip( URL url )
{
// This is an internal undocumented routine. However, it
// also provides needed functionality not otherwise available.
// I suspect that in a future release, JavaSoft will add an
// audio content handler which encapsulates this, and then
// we can just do a getContent just like for images.
return new sun.applet.AppletAudioClip( url );
}

public Image getImage( URL url )
{
Toolkit tk = Toolkit.getDefaultToolkit();
try
{
ImageProducer prod = (ImageProducer) url.getContent();
return tk.createImage( prod );
}
catch ( IOException e )
{
return null;
}
}

public Applet getApplet( String name )
{
// Returns this Applet or nothing.
if ( name.equals( this.name ) )
return applet;
return null;
}

public Enumeration getApplets()
{
// Just yields this applet.
Vector v = new Vector();
v.addElement( applet );
return v.elements();
}

public void showDocument( URL url )
{
// Ignore.
}

public void showDocument( URL url, String target )
{
// Ignore.
}

public void showStatus( String status )
{
if ( label != null )
label.setText( status );
}

}

** 2nd Code : StubToolkit.java code
—————————————————–
// StubToolkit – bare-bones Toolkit for non-GUI applications
//
//
</BLOCKQUOTE>
// <P>
// <A HREF=”/resources/classes/Acme/JPM/StubToolkit.java”>Fetch the software.</A><BR>
// <A HREF=”/resources/classes/Acme.tar.gz”>Fetch the entire Acme package.</A>

public class StubToolkit extends Toolkit
{

static
{
// Load C library to get GIF-parsing routine. Dunno how portable
// this is to non-Solaris machines.
System.loadLibrary(“awt”);
}

public StubToolkit()
{
}

// Fail to create peer objects.
public WindowPeer createWindow( Window target )
{
throw new InternalError( “not implemented” );
}
public FramePeer createFrame( Frame target )
{
throw new InternalError( “not implemented” );
}
public CanvasPeer createCanvas( Canvas target )
{
throw new InternalError( “not implemented” );
}
public PanelPeer createPanel( Panel target )
{
throw new InternalError( “not implemented” );
}
public ButtonPeer createButton( Button target )
{
throw new InternalError( “not implemented” );
}
public TextFieldPeer createTextField( TextField target )
{
throw new InternalError( “not implemented” );
}
public ChoicePeer createChoice( Choice target )
{
throw new InternalError( “not implemented” );
}
public LabelPeer createLabel( Label target )
{
throw new InternalError( “not implemented” );
}
public ListPeer createList( java.awt.List target )
{
throw new InternalError( “not implemented” );
}
public CheckboxPeer createCheckbox( Checkbox target )
{
throw new InternalError( “not implemented” );
}
public ScrollbarPeer createScrollbar( Scrollbar target )
{
throw new InternalError( “not implemented” );
}
public ScrollPanePeer createScrollPane( ScrollPane target )
{
throw new InternalError( “not implemented” );
}
public TextAreaPeer createTextArea( TextArea target )
{
throw new InternalError( “not implemented” );
}
public DialogPeer createDialog( Dialog target )
{
throw new InternalError( “not implemented” );
}
public FileDialogPeer createFileDialog( FileDialog target )
{
throw new InternalError( “not implemented” );
}
public MenuBarPeer createMenuBar( MenuBar target )
{
throw new InternalError( “not implemented” );
}
public MenuPeer createMenu( Menu target )
{
throw new InternalError( “not implemented” );
}
public PopupMenuPeer createPopupMenu( PopupMenu target )
{
throw new InternalError( “not implemented” );
}
public MenuItemPeer createMenuItem( MenuItem target )
{
throw new InternalError( “not implemented” );
}
public CheckboxMenuItemPeer createCheckboxMenuItem( CheckboxMenuItem target )
{
throw new InternalError( “not implemented” );
}
public FontPeer getFontPeer( String name, int style )
{
throw new InternalError( “not implemented” );
}

public Dimension getScreenSize()
{
return new Dimension( getScreenWidth(), getScreenHeight() );
}

static ColorModel colorModel = null;

public synchronized ColorModel getColorModel()
{
if ( colorModel == null )
colorModel = ColorModel.getRGBdefault();
return colorModel;
}

static Toolkit toolkit = null;

public static synchronized Toolkit getDefaultToolkit()
{
if ( toolkit == null )
toolkit = new StubToolkit();
return toolkit;
}

public int getScreenResolution()
{
throw new InternalError( “not implemented” );
}
int getScreenWidth()
{
throw new InternalError( “not implemented” );
}
int getScreenHeight()
{
throw new InternalError( “not implemented” );
}
public String[] getFontList()
{
throw new InternalError( “not implemented” );
}
public FontMetrics getFontMetrics( Font font )
{
throw new InternalError( “not implemented” );
}

public void sync()
{
}

static Hashtable imgHash = new Hashtable();

static synchronized Image getImageFromHash( Toolkit tk, URL url )
{
SecurityManager security = System.getSecurityManager();
if ( security != null )
security.checkConnect( url.getHost(), url.getPort() );
Image img = (Image) imgHash.get( url );
if ( img == null )
{
try
{
img = tk.createImage( (ImageProducer) url.getContent() );
imgHash.put( url, img );
}
catch ( Exception e )
{}
}
return img;
}

static synchronized Image getImageFromHash( Toolkit tk, String filename )
{
SecurityManager security = System.getSecurityManager();
if ( security != null )
security.checkRead( filename );
Image img = (Image) imgHash.get( filename );
if ( img == null )
{
try
{
img = tk.createImage( new FileImageSource( filename ) );
imgHash.put( filename, img );
}
catch ( Exception e )
{}
}
return img;
}

public Image getImage( String filename )
{
return getImageFromHash( this, filename );
}

public Image getImage( URL url )
{
return getImageFromHash( this, url );
}

static boolean prepareScrImage( Image img, int w, int h, ImageObserver o )
{
if ( w == 0 || h == 0 )
return true;
StubImage ximg = (StubImage) img;
if ( ximg.hasError() )
{
if ( o != null )
o.imageUpdate( img, ImageObserver.ERROR|ImageObserver.ABORT,
-1, -1, -1, -1 );
return false;
}
if ( w < 0 ) w = -1;
if ( h < 0 ) h = -1;
ImageRepresentation ir = ximg.getImageRep();
return ir.prepare( o );
}

static int checkScrImage( Image img, int w, int h, ImageObserver o )
{
StubImage ximg = (StubImage) img;
int repbits;
if ( w == 0 || h == 0 )
repbits = ImageObserver.ALLBITS;
else
{
if ( w < 0 ) w = -1;
if ( h < 0 ) h = -1;
repbits = ximg.getImageRep().check( o );
}
return ximg.check( o ) | repbits;
}

public int checkImage( Image img, int w, int h, ImageObserver o )
{
return checkScrImage( img, w, h, o );
}

public boolean prepareImage( Image img, int w, int h, ImageObserver o )
{
return prepareScrImage( img, w, h, o );
}

public Image createImage( ImageProducer producer )
{
return new StubImage( producer );
}
public Image createImage( byte[] imagedata, int imageoffset, int imagelength)
{
/*
return new StubImage( imagedata, imageoffset, imagelength );
*/
throw new InternalError( “not implemented” );
}

public PrintJob getPrintJob( Frame frame, String jobtitle, Properties props )
{
throw new InternalError( “not implemented” );
}
public void beep()
{
( new Acme.SynthAudioClip( 440, 250 ) ).play();
}
public java.awt.datatransfer.Clipboard getSystemClipboard()
{
throw new InternalError( “not implemented” );
}
public java.awt.EventQueue getSystemEventQueueImpl()
{
throw new InternalError( “not implemented” );
}
public java.awt.dnd.peer.DragSourceContextPeer createDragSourceContextPeer( java.awt.dnd.DragSource ds, java.awt.Component c )
{
throw new InternalError( “not implemented” );
}

}

class StubImage extends sun.awt.image.Image
{

/*
// Construct an image from image data.
public StubImage( byte[] imagedata, int imageoffset, int imagelength )
{
super( imagedata, imageoffset, imagelength );
}
*/

// Construct an image from an ImageProducer object.
public StubImage( ImageProducer producer )
{
super( producer );
}

public Graphics getGraphics()
{
return new StubGraphics( this );
}

protected sun.awt.image.ImageRepresentation getImageRep()
{
return super.getImageRep();
}

protected sun.awt.image.ImageRepresentation makeImageRep()
{
return null;
}

}

class StubGraphics extends Graphics {

private void imageCreate( ImageRepresentation ir )
{
// !!!
throw new InternalError( “not implemented” );
}

public StubGraphics( Graphics g )
{
}

public StubGraphics( Image image )
{
// !!!
throw new InternalError( “not implemented” );
}

// Create a new Graphics Object based on this one.
public Graphics create()
{
StubGraphics g = new StubGraphics( this );
return g;
}

public void translate( int x, int y )
{
throw new InternalError( “not implemented” );
}

public void dispose()
{
// Nothing.
}

public Font getFont()
{
throw new InternalError( “not implemented” );
}
public void setFont( Font font )
{
throw new InternalError( “not implemented” );
}
public FontMetrics getFontMetrics( Font font )
{
throw new InternalError( “not implemented” );
}
public Color getColor()
{
throw new InternalError( “not implemented” );
}
public void setColor( Color c )
{
throw new InternalError( “not implemented” );
}
public void setPaintMode()
{
throw new InternalError( “not implemented” );
}
public void setXORMode( Color c )
{
throw new InternalError( “not implemented” );
}

public Rectangle getClipRect()
{
throw new InternalError( “not implemented” );
}
public Rectangle getClipBounds()
{
throw new InternalError( “not implemented” );
}
public void clipRect( int x, int y, int w, int h )
{
throw new InternalError( “not implemented” );
}
public void setClip( int x, int y, int w, int h )
{
throw new InternalError( “not implemented” );
}
public Shape getClip()
{
throw new InternalError( “not implemented” );
}
public void setClip( Shape clip )
{
throw new InternalError( “not implemented” );
}
public void drawLine( int x1, int y1, int x2, int y2 )
{
throw new InternalError( “not implemented” );
}
public void fillRect( int x, int y, int w, int h )
{
throw new InternalError( “not implemented” );
}
public void clearRect( int x, int y, int w, int h )
{
throw new InternalError( “not implemented” );
}
public void drawString( String str, int x, int y )
{
throw new InternalError( “not implemented” );
}
public void drawChars( char[] data, int offset, int length, int x, int y )
{
throw new InternalError( “not implemented” );
}
public void drawBytes( byte[] data, int offset, int length, int x, int y )
{
throw new InternalError( “not implemented” );
}
public boolean drawImage( Image img, int x, int y, ImageObserver observer )
{
throw new InternalError( “not implemented” );
}
public boolean drawImage(
Image img, int x, int y, int width, int height, ImageObserver observer )
{
throw new InternalError( “not implemented” );
}
public boolean drawImage(
Image img, int x, int y, Color bg, ImageObserver observer )
{
throw new InternalError( “not implemented” );
}
public boolean drawImage(
Image img, int x, int y, int width, int height, Color bg,
ImageObserver observer )
{
throw new InternalError( “not implemented” );
}
public boolean drawImage(
Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1,
int sx2, int sy2, ImageObserver observer )
{
throw new InternalError( “not implemented” );
}
public boolean drawImage(
Image img, int dx1, int dy1, int dx2, int dy2, int sx1, int sy1,
int sx2, int sy2, Color bgcolor, ImageObserver observer)
{
throw new InternalError( “not implemented” );
}

public void copyArea( int x, int y, int w, int h, int dx, int dy )
{
throw new InternalError( “not implemented” );
}
public void drawRoundRect( int x, int y, int w, int h, int arcWidth, int arcHeight )
{
throw new InternalError( “not implemented” );
}
public void fillRoundRect( int x, int y, int w, int h, int arcWidth, int arcHeight )
{
throw new InternalError( “not implemented” );
}
public void drawPolygon( int[] xPoints, int[] yPoints, int nPoints )
{
throw new InternalError( “not implemented” );
}
public void fillPolygon( int[] xPoints, int[] yPoints, int nPoints )
{
throw new InternalError( “not implemented” );
}
public void drawOval( int x, int y, int w, int h )
{
throw new InternalError( “not implemented” );
}
public void fillOval( int x, int y, int w, int h )
{
throw new InternalError( “not implemented” );
}
public void drawArc( int x, int y, int w, int h, int startAngle, int endAngle )
{
throw new InternalError( “not implemented” );
}
public void fillArc( int x, int y, int w, int h, int startAngle, int endAngle )
{
throw new InternalError( “not implemented” );
}
public void drawPolyline( int[] xPoints, int[] yPoints, int nPoints )
{
throw new InternalError( “not implemented” );
}

}

[Ivar Vasara]

The type MainFrame must implement the inherited abstract method

umm, that means you have to implement the stated methods.. look up what it means for a class to be “abstract”.

[Author]

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