**************************** Code examples for interfaces: * Class1.java implements Interface1.java * Abstract Class2.java implements Interface1.java and Interface2.java * Class3.java extends abstract class Class2.java * Interface3.java extends Interface1.java and Interface2.java *************************** ~~~~~~~~~~~~~~~~~~~~~~~~~~~ Class1.java ~~~~~~~~~~~~~~~~~~~~~~~~~~~ // This class is not abstract, so it must provide // implementations of method1 and method2. public class Class1 …
Category: Code . Programming Samples . প্রোগ্রাম উদাহরন
Code . Programming Samples . প্রোগ্রাম উদাহরন
Aug 29
A Ship class illustrating object-oriented programming concepts
************************ Ship.java A Ship class illustrating object-oriented programming concepts. Incorporates Javadoc comments. See ShipTest.java for a test. ************************ /** Ship example to demonstrate OOP in Java. * * @author * Larry Brown * @version 2.0 */ public class Ship { // Instance variables private double x=0.0, y=0.0, speed=1.0, direction=0.0; private String name; …
Aug 29
Accesses instance variables in a Ship object.
Test1.java Accesses instance variables in a Ship object. ******************************************************** // Create a class with five instance variables (fields): // x, y, speed, direction, and name. Note that Ship1 is // not declared “public”, so it can be in the same file as // Test1. A Java file can only contain one “public” class // definition. …
Aug 29
Application that reports all command-line arguments
****************** ShowArgs.java Application that reports all command-line arguments. ****************** */ public class ShowArgs { public static void main(String[] args) { for(int i=0; i
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
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 …
Aug 29
NumFormat.java Formats real numbers with DecimalFormat.
import java.text.*; /** Formatting real numbers with DecimalFormat. * * 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 NumFormat { public static void main (String[] args) { DecimalFormat …
Aug 29
ModificationTest.java Demonstrates changing fields of an object. Inherits from ReferenceTest.java.
/** Taken from Core Web Programming from * Prentice Hall and Sun Microsystems Press, * . * © 2001 Marty Hall and Larry Brown; * may be freely used or adapted. */ import java.awt.Point; public class ModificationTest extends ReferenceTest { public static void main(String[] args) { Point p1 = new Point(1, 2); // …
Aug 29
Tests the class type of an object using the isInstance method (preferred over instanceof operator).
/** 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 {} …
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 …
