What is Java?
Java allows you to play online games, chat with people around the world, calculate your mortgage interest, and view images in 3D, just to name a few. It's also integral to the intranet applications and other e-business solutions that are the foundation of corporate computingBCA-501.INTERNET APPLICATIONS AND JAVAINSTRUCTIONS FOR PAPER-SETTERThe question paper will consist of Two parts, A and B. Part A will have 15 short answer questions (40-60 words) of 2 marks each. Part B will have 12 long answer questions of 5 marks each.The syllabus of the subject is divided into 3 sections I, II and III. The question paper will cover the entire syllabus uniformly. Part A will carry 5 questions from each Section Ind Part B will carry 4 questions from each section.INSTRUCTION FOR CANDIDATESCandidates are required to attempt all questions from Part A and 9 questions of Part B out of 12._____________________________________________________________________Section IIntroduction: Internet Architecture board, understanding the internet.Concept: Working, Surfing and security on the internet.Internet protocols Internet addressing, internet routing protocols internet message protocol, internet group management protocols, internet mail protocol.Internet applications: E-mail, multi cost backbone, net news.Web: World Wide Web advantages of web, web terminology, web access using web browser, locating information on the web.Section IIIntroduction to Java: Applets, application & JDK, different b/w Java & C++, working with Java objects: Encapsulation, inheritance & polymorphism, constructors. Garbage collection & finalisers, data types, modifies & expressions, array & flow control statements.Section IIIException handling threads, event handling, network programming & Java virtual machines, Java & databases.BCA-502download Java for Windows - Firefox/Mozilla
Recommended Version 6 Update 13 (filesize: ~ 10 MB)Windows Vista, XP, 2000, 2003, 2008 Serverhttp://www.java.com/en/download/inc/windows_new_xpi.jspjava programe...graphics/*
* @(#)GraphicsTest.java 1.18 06/02/22
*/
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import java.applet.Applet;
class GraphicsPanel extends Panel {
ActionListener al;
ItemListener il;
public GraphicsCards cards;
GraphicsPanel(EventListener listener) {
al = (ActionListener)listener;
il = (ItemListener)listener;
setLayout(new BorderLayout());
add("Center", cards = new GraphicsCards());
Panel p = new Panel();
//p.setLayout(new BorderLayout());
Button b = new Button("next");
b.addActionListener(al);
p.add(b);
b = new Button("previous");
b.addActionListener(al);
p.add(b);
p.add(new Label("go to:", Label.RIGHT));
Choice c = new Choice();
c.addItemListener(il);
p.add(c);
c.addItem("Arc");
c.addItem("Oval");
c.addItem("Polygon");
c.addItem("Rect");
c.addItem("RoundRect");
add("North", p);
setSize(400, 400);
}
public Dimension getPreferredSize() {
return new Dimension(200, 100);
}
}
public class GraphicsTest extends Applet
implements ActionListener, ItemListener {
GraphicsPanel mainPanel;
public void init() {
setLayout(new BorderLayout());
add("Center", mainPanel = new GraphicsPanel(this));
}
public void destroy() {
remove(mainPanel);
}
public void actionPerformed(ActionEvent e) {
String arg = e.getActionCommand();
if ("next".equals(arg)) {
((CardLayout)mainPanel.cards.getLayout()).next(mainPanel.cards);
}
else if ("previous".equals(arg)) {
((CardLayout)mainPanel.cards.getLayout()).previous(mainPanel.cards);
}
}
public void itemStateChanged(ItemEvent e) {
((CardLayout)mainPanel.cards.getLayout()).show(mainPanel.cards,(String)e.getItem());
}
public static void main(String args[]) {
AppletFrame.startApplet("GraphicsTest", "Graphics Test", args);
}
public String getAppletInfo() {
return "An interactive demonstration of some graphics.";
}
} // end class GraphicsTest
class GraphicsCards extends Panel {
public GraphicsCards() {
setLayout(new CardLayout());
add("Arc", new ArcCard());
add("Oval", new ShapeTest( new OvalShape() ) );
add("Polygon", new ShapeTest( new PolygonShape() ) );
add("Rect", new ShapeTest( new RectShape() ) );
add("RoundRect", new ShapeTest( new RoundRectShape() ) );
}
} // end class GraphicsCards
class ArcCard extends Panel {
public ArcCard() {
setLayout(new GridLayout(0, 2));
add(new ArcPanel(true));
add(new ArcPanel(false));
add(new ArcDegreePanel(true));
add(new ArcDegreePanel(false));
}
} // end class ArcCard
class ArcDegreePanel extends Panel {
boolean filled;
public ArcDegreePanel(boolean filled) {
this.filled = filled;
}
void arcSteps(Graphics g,
int step,
int x,
int y,
int w,
int h,
Color c1,
Color c2) {
int a1 = 0;
int a2 = step;
int progress = 0;
g.setColor(c1);
for (; (a1+a2) <= 360; a1 = a1+a2, a2 += 1) { if (g.getColor() == c1) { g.setColor(c2); } else { g.setColor(c1); } if (filled) { g.fillArc(x, y, w, h, a1, a2); } else { g.drawArc(x, y, w, h, a1, a2); } progress = a1+a2; } // end for if (progress != 360) { if (filled) { g.fillArc(x, y, w, h, a1, 360 - progress); } else { g.drawArc(x, y, w, h, a1, 360 - progress); } } // end if } // end arcSteps() public void paint(Graphics g) { Rectangle r = getBounds(); arcSteps(g, 3, 0, 0, r.width, r.height, Color.orange, Color.blue); arcSteps(g, 2, r.width / 4, r.height / 4, r.width / 2, r.height / 2, Color.yellow, Color.green); arcSteps(g, 1, (r.width * 3) / 8, (r.height * 3) / 8, r.width / 4, r.height / 4, Color.magenta, Color.white); } // end paint() } // end class ArcDegreePanel class ArcPanel extends Panel { boolean filled; public ArcPanel(boolean filled) { this.filled = filled; } public void paint(Graphics g) { Rectangle r = getBounds(); g.setColor(Color.yellow); if (filled) { g.fillArc(0, 0, r.width, r.height, 0, 45); } else { g.drawArc(0, 0, r.width, r.height, 0, 45); } g.setColor(Color.green); if (filled) { g.fillArc(0, 0, r.width, r.height, 90, -45); } else { g.drawArc(0, 0, r.width, r.height, 90, -45); } g.setColor(Color.orange); if (filled) { g.fillArc(0, 0, r.width, r.height, 135, -45); } else { g.drawArc(0, 0, r.width, r.height, 135, -45); } g.setColor(Color.magenta); if (filled) { g.fillArc(0, 0, r.width, r.height, -225, 45); } else { g.drawArc(0, 0, r.width, r.height, -225, 45); } g.setColor(Color.yellow); if (filled) { g.fillArc(0, 0, r.width, r.height, 225, -45); } else { g.drawArc(0, 0, r.width, r.height, 225, -45); } g.setColor(Color.green); if (filled) { g.fillArc(0, 0, r.width, r.height, -135, 45); } else { g.drawArc(0, 0, r.width, r.height, -135, 45); } g.setColor(Color.orange); if (filled) { g.fillArc(0, 0, r.width, r.height, -45, -45); } else { g.drawArc(0, 0, r.width, r.height, -45, -45); } g.setColor(Color.magenta); if (filled) { g.fillArc(0, 0, r.width, r.height, 315, 45); } else { g.drawArc(0, 0, r.width, r.height, 315, 45); } } // end paint() } // end class ArcPanel abstract class Shape { abstract void draw(Graphics g, int x, int y, int w, int h); abstract void fill(Graphics g, int x, int y, int w, int h); } class RectShape extends Shape { void draw(Graphics g, int x, int y, int w, int h) { g.drawRect(x, y, w, h); } void fill(Graphics g, int x, int y, int w, int h) { g.fillRect(x, y, w, h); } } class OvalShape extends Shape { void draw(Graphics g, int x, int y, int w, int h) { g.drawOval(x, y, w, h); } void fill(Graphics g, int x, int y, int w, int h) { g.fillOval(x, y, w, h); } } class RoundRectShape extends Shape { void draw(Graphics g, int x, int y, int w, int h) { g.drawRoundRect(x, y, w, h, 10, 10); } void fill(Graphics g, int x, int y, int w, int h) { g.fillRoundRect(x, y, w, h, 10, 10); } } class PolygonShape extends Shape { // class variables Polygon p; Polygon pBase; public PolygonShape() { pBase = new Polygon(); pBase.addPoint(0, 0); pBase.addPoint(10, 0); pBase.addPoint(5, 15); pBase.addPoint(10, 20); pBase.addPoint(5, 20); pBase.addPoint(0, 10); pBase.addPoint(0, 0); } void scalePolygon(float w, float h) { p = new Polygon(); for (int i = 0; i < ng =" g.create();" ng =" g.create();" shape =" shape;" step =" step;" bounds =" getBounds();" color="Color.red," cx="bounds.x," cy="bounds.y," cw="bounds.width" ch="bounds.height;"> 0 && ch > 0;
cx+=step,
cy += step,
cw -= (step * 2),
ch -= (step * 2),
color=ColorUtils.darker(color, 0.9) ) {
g.setColor(color);
shape.draw(g, cx, cy, cw, ch);
}
for (cx=bounds.x + bounds.width / 2,
cy=bounds.y,
cw=bounds.width / 2, ch=bounds.height;
cw > 0 && ch > 0;
cx+=step,
cy += step,
cw -= (step * 2),
ch -= (step * 2) ) {
if (g.getColor() == Color.red) {
g.setColor(Color.blue);
}
else {
g.setColor(Color.red);
}
shape.fill(g, cx, cy, cw, ch);
} // end for
} // end paint()
} // end class ShapeTest
class ColorUtils {
static Color brighter(Color c, double factor) {
return new Color( Math.min((int)(c.getRed() *(1/factor)), 255),
Math.min((int)(c.getGreen()*(1/factor)), 255),
Math.min((int)(c.getBlue() *(1/factor)), 255) );
}
static Color darker(Color c, double factor) {
return new Color( Math.max((int)(c.getRed() *factor), 0),
Math.max((int)(c.getGreen()*factor), 0),
Math.max((int)(c.getBlue() *factor), 0) );
}
}
