/** Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © 2001 Marty Hall and Larry Brown; * may be freely used or adapted. */ interface Barking {} class Mammal {} class Canine extends Mammal {} class Dog extends Canine implements Barking {} class Retriever extends Dog {} …
Tag: Java
Aug 29
URLTest.java Demonstrates try/catch blocks.
/** Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © 2001 Marty Hall and Larry Brown; * may be freely used or adapted. */ // Further simplified getURL method. public URL getURL() { if (url != null) { return(url); } …
Aug 29
ExecTest.java illustrates use of the Exec class.
/** A test of the Exec class. * * Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © 2001 Marty Hall and Larry Brown; * may be freely used or adapted. */ public class ExecTest { public static void main(String[] args) { // Note: no …
Aug 29
DropBall.java Uses a while loop to determine how long it takes a ball to fall from the top of the Washington Monument to the ground.
/** Simulating dropping a ball from the top of the Washington * Monument. The program outputs the height of the ball each * second until the ball hits the ground. * * Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © 2001 Marty Hall and Larry Brown; …
Aug 29
Loading Images
JavaMan1.java Applet that loads an image from a relative URL. ************************************************************* import java.applet.Applet; import java.awt.*; /** An applet that loads an image from a relative URL. * >>>>>>>>>>>>>>>>>>> public class JavaMan1 extends Applet { private Image javaMan; public void init() { javaMan = getImage(getCodeBase(),”images/Java-Man.gif”); } public void paint(Graphics g) { …
Aug 29
Basic template for a Java applet
AppletTemplate.java >>>>>>>>>>>>>>>>>>>> import java.applet.Applet; import java.awt.*; ******************** public class AppletTemplate extends Applet { // Variable declarations. public void init() { // Variable initializations, image loading, etc. } public void paint(Graphics g) { // Drawing operations. } } >>>>>>>>>>>>>>>>>>>>>
Aug 29
ForwardSnippet.java Partial servlet illustrating how to use a RequestDispatcher to forward requests
ForwardSnippet.java Partial servlet illustrating how to use a RequestDispatcher to forward requests public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException { String operation = request.getParameter(“operation”); if (operation == null) { operation = “unknown”; } if (operation.equals(“operation1”)) { gotoPage(“/operations/presentation1.jsp”, request, response); } else if (operation.equals(“operation2”)) …
Aug 29
Example illustrating inheritance and abstract classes
*********************************** # Example illustrating inheritance and abstract classes. * Shape.java The parent class (abstract) for all closed, open, curved, and straight-edged shapes. * Curve.java An (abstract) curved Shape (open or closed). * StraightEdgedShape.java A Shape with straight edges (open or closed). * Measurable.java Interface defining classes with measurable areas. * …
Aug 29
Speedboat.java Illustrates inheritance from Ship class
***************************** Speedboat.java Illustrates inheritance from Ship class. See SpeedboatTest.java for a test. ***************************** /** A fast Ship. Red and going 20 knots by default. * *********************** public class Speedboat extends Ship { private String color = “red”; /** Builds a red Speedboat going N at 20 knots. */ public Speedboat(String name) …
Aug 29
Demonstrates overloading methods in class Ship4
********************* class Ship4 { public double x=0.0, y=0.0, speed=1.0, direction=0.0; public String name; // This constructor takes the parameters explicitly. public Ship4(double x, double y, double speed, double direction, String name) { this.x = x; this.y = y; this.speed = speed; this.direction = direction; …