Mama-I-just-wanna-learn-Java or the Gosh-Java-is-soooo-simple ! types. However, if you don't mind lurking in the techno-wilderness of a Programming Language that's spreading like wild fire, hoping to catch a flicker yourself, read on....
Program 1
import java.applet.*;
import java.awt.*;
public class zzz extends Applet {
public void paint(Graphics g)
{
showStatus(g.getClipRect().toString());
}
}
Program 2
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Color d;
Color c;
public void init()
{
c = getBackground();
d = new Color(255,0,0);
setBackground(d);
}
public void paint(Graphics g)
{
showStatus(c.toString());
}
}
Program 3
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ public void paint(Graphics g)
{ showStatus(g.toString());
}
}
Program 4
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ public boolean mouseDown(Event e, int x,int y)
{ Graphics g = getGraphics();
g.setColor(Color.red);
g.drawLine(0,0,x,y);
return true;
}
}
Program 5
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Button b;
public void init()
{
b =new Button("hell");
add(b);
}
public boolean mouseDown(Event e, int x,int y)
{
Toolkit t1 = b.getToolkit();
Toolkit t = getToolkit();
showStatus("size "+t.getScreenSize()+ "button " + t1.getScreenSize());
return true;
}
}
Program 6
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Button b;
public void init()
{
b =new Button("hell");
add(b);
add(new Button("hi"));
}
public boolean mouseDown(Event e, int x,int y)
{ Component c = b.getParent();
c.hide();
return true;
}
}
Program 7
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Button b;
public void init()
{ b =new Button("hell");
add(b);
add(new Button("hi"));
}
public boolean mouseDown(Event e, int x,int y)
{ Component c;
c = getComponent(1);
Button j;
j = (Button ) c;
showStatus(j.getLabel());
return true;
}
}
Program 8
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Button b;
public void init()
{ b =new Button("hell");
add(b);
add(new Button("hi"));
}
public boolean mouseDown(Event e, int x,int y)
{ showStatus(b.bounds().toString() + ".." + b.location().toString());
return true;
}
}
Program 9
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Button b;
public void init()
{ b =new Button("hell");
add(b);
add(new Button("hi"));
}
public boolean mouseDown(Event e, int x,int y)
{ showStatus(preferredSize().toString());
return true;
}
}
Program 10
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Scrollbar s;
public void init()
{
setLayout(new BorderLayout());
s = new Scrollbar(Scrollbar.HORIZONTAL,10,5,1,100);
add("North",s);
}
public boolean mouseDown(Event e, int x,int y)
{ s.setValue(s.getValue()+5);
showStatus("value " + s.getValue());
return true;
}
}
Program 11
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Button b;
public void init()
{ b = new Button("hell");
add(b);
}
public void paint(Graphics g)
{ showStatus(b.getClass().getName() + "..." + b.getClass().toString());
}
}
Program 12
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Button b;Class c;Class d;
public void init()
{ b = new Button("hell");
c = b.getClass();
d = c.getSuperclass();
add(b);
}
public void paint(Graphics g)
{ showStatus(d.getName());
}
}
Program 13
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Button b; Class c; Button b1;
public void init()
{ b = new Button("hell");
c = b.getClass();
try b1 = ( Button ) c.newInstance();
catch ( Exception e)
{ showStatus("error");
}
add(b);
b1.setLabel("good");
add(b1);
}
}
Program 14
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
public class zzz extends Applet
{ SecurityManager s;Object o;Class c;
public void init()
{ s = System.getSecurityManager();
o = s.getSecurityContext();
c = o.getClass();
}
public void paint(Graphics g)
{ showStatus(c.getName());
}
}
Program 15
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
public class zzz extends Applet
{ SecurityManager s;URL u;
public void init()
{ s = System.getSecurityManager();
u = (URL ) s.getSecurityContext();
}
public void paint(Graphics g)
{ showStatus(u.toString()+".."+u.getProtocol()+".."+u.getHost()+".."+u.getRef());
}
}
Program 16
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
public class zzz extends Applet
{ SecurityManager s;
public void init()
{ s = System.getSecurityManager();
}
public void paint(Graphics g)
{ boolean b = s.checkTopLevelWindow(this);
if ( b )
showStatus("true");
else
showStatus("false");
}
}
Program 17
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
public class zzz extends Applet
{ SecurityManager s;
public void init()
{ s = System.getSecurityManager();
}
public void paint(Graphics g)
{ try s.checkPackageAccess("java.net");
catch (SecurityException e ) { showStatus("error");}
}
}
Program 18
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
public class zzz extends Applet
{ SecurityManager s;
public void init()
{ s = System.getSecurityManager();
}
public void paint(Graphics g)
{ try s.checkRead("a.txt");
catch (SecurityException e ) { showStatus("error");}
}
}
Program 19
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
public class zzz extends Applet
{ SecurityManager s;
public void init()
{ s = System.getSecurityManager();
}
public void paint(Graphics g)
{ try s.checkExec("DIR");
catch (SecurityException e ) { showStatus("error");}
}
}
Program 20
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
public class zzz extends Applet
{ public void paint(Graphics g)
{ showStatus(System.getProperty("java.vendor"));
}
}
Program 21
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
import java.util.*;
public class zzz extends Applet implements Runnable
{ Class c; Class c1; String s; Frame w; int n=0;
Button b; Label l; Thread t;
public void init()
{ setLayout(new GridLayout(2,0));
add(b=new Button("Click here to bring up a zzz Window"));
b.setFont(new Font("Helvetica", Font.PLAIN, 14));
add(l = new Label("", Label.CENTER));
try c = Class.forName("zzz");
catch (Exception e)
{ l.setText("Can't create window:Couldn't find class zzz ");
b.disable();
return;
}
System.out.println(c.getName());
c1 = c;
s = c1.getName();
while (!(s.equals("java.lang.Object")||s.equals("java.awt.Frame")))
{ c1 = c1.getSuperclass();
s = c1.getName();
System.out.println(c1.getName() + "..." + s);
}
if ( (s == null) || s.equals("java.lang.Object") )
{ l.setText("Can't create window:zzz isn't a Frame subclass.");
b.disable();
return ;
}
t = new Thread(this, "Bringing Up zzz Window");
t.start();
}
public synchronized void run()
{ while ( true )
{ System.out.println("Before Try");
try wait(); catch (InterruptedException e) {}
System.out.println("After Try");
try w = (Frame)c.newInstance();
catch (Exception e)
{ l.setText("Couldn't create instance of class zzz");
return ;
}
w.setTitle("Window no " + n );
n++;
w.show();
l.setText("");
}
}
public synchronized boolean action(Event e, Object o)
{ if (e.target instanceof Button)
{ l.setText("Please wait while the window comes up...");
notify();
return true;
}
return false;
}
}
class zzz extends Frame
{
}
Program 22
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
import java.util.*;
public class zzz extends Applet
{ public void paint(Graphics g)
{ String s = "Hello how are you";
StringTokenizer t = new StringTokenizer(s);
while ( t.hasMoreTokens() )
{ String s1 = t.nextToken();
System.out.println(s1);
}
}
}
Program 23
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
import java.util.*;
public class zzz extends Applet
{ Panel z;
public void init()
{ setLayout(new BorderLayout());
Panel p = new Panel();
Choice c = new Choice();
c.addItem("Button");
c.addItem("Text");
p.add(c);
add("North",p);
z = new Panel();
z.setLayout(new CardLayout());
Panel p1 = new Panel();
p1.add(new Button("Button 1"));
p1.add(new Button("Button 2"));
p1.add(new Button("Button 3"));
Panel p2 = new Panel();
p2.add(new TextField("TextField", 20));
z.add("Button", p1);
z.add("Text", p2);
add("Center", z);
}
public boolean action(Event e, Object o)
{ if (e.target instanceof Choice)
{ CardLayout cl;
cl = (CardLayout)z.getLayout();
cl.show(z, (String) o);
showStatus((String) o);
return true;
}
return false;
}
}
Program 24
import java.applet.*;
import java.awt.*;
public class zzz extends Applet
{ Scrollbar s;
public void init()
{ setLayout(new BorderLayout());
s = new Scrollbar(Scrollbar.HORIZONTAL,20,5,1,100);
add("North",s);
}
public boolean mouseDown(Event e, int x,int y)
{ s.setValue(s.getValue()+5);
showStatus("value " + s.getValue());
return true;
}
}
Program 25
import java.lang.*;
import java.applet.*;
import java.awt.*;
import java.net.*;
import java.util.*;
public class zzz extends Applet implements Runnable
{ Class c; Class c1; String s; Frame w; int n=0;
Button b; Label l; Thread t;
public void init()
{ setLayout(new GridLayout(2,0));
add(b=new Button("Click here to bring up a zzz Window"));
b.setFont(new Font("Helvetica", Font.PLAIN, 14));
add(l = new Label("", Label.CENTER));
try c = Class.forName("zzz");
catch (Exception e)
{ l.setText("Can't create window:Couldn't find class zzz1 ");
b.disable();
return;
}
System.out.println(c.getName());
c1 = c; s = c1.getName();
while (!(s.equals("java.lang.Object")||s.equals("java.awt.Frame")))
{ c1 = c1.getSuperclass();
s = c1.getName();
System.out.println(c1.getName() + "..." + s);
}
if ( (s == null) || s.equals("java.lang.Object") )
{ l.setText("Can't create window:zzz1 isn't a Frame subclass.");
b.disable();
return ;
}
t = new Thread(this, "Bringing Up zzz1 Window");
t.start();
}
public synchronized void run()
{
while ( true )
{ System.out.println("Before Try");
try wait(); catch (InterruptedException e) {}
System.out.println("After Try");
try w = (Frame)c.newInstance();
catch (Exception e)
{ l.setText("Couldn't create instance of class zzz");
return ;
}
w.setTitle("Window no " + n );
n++;
w.show();
l.setText("");
}
}
public synchronized boolean action(Event e, Object o)
{ if (e.target instanceof Button)
{ l.setText("Please wait while the window comes up...");
notify();
return true;
}
return false;
}
}
class zzz1 extends Frame
{
}
If all this glop didn't want you wanting to hibernate, rush on to the next topic "The C++ Connection" or now that you are here, take out a couple of minutes and toss your comments, feedback, suggestions etc. to us (we'll love the etc. )