UrlTest.java  Demonstrates the ease in which the various components of an URL can be determined (host, port, protocol, etc.). 


import java.net.*;

/** Read a URL from the command line, then print
 *  the various components.
 *
 *  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 UrlTest {
  public static void main(String[] args) {
    if (args.length == 1) {
      try {
        URL url = new URL(args[0]);
        System.out.println
          ("URL: " + url.toExternalForm() + "n" +
           "  File:      " + url.getFile() + "n" +
           "  Host:      " + url.getHost() + "n" +
           "  Port:      " + url.getPort() + "n" +
           "  Protocol:  " + url.getProtocol() + "n" +
           "  Reference: " + url.getRef());
      } catch(MalformedURLException mue) {
        System.out.println("Bad URL.");
      }
    } else
      System.out.println("Usage: UrlTest ");
  }
}

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UrlRetriever2.java  Illustrates how the URL class can simplify communication to an HTTP server.

import java.net.*;
import java.io.*;

/** Read a remote file using the standard URL class
 *  instead of connecting explicitly to the HTTP server.
 *
 *  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 UrlRetriever2 {
  public static void main(String[] args) {
    checkUsage(args);
    try {
      URL url = new URL(args[0]);
      BufferedReader in = new BufferedReader(
        new InputStreamReader(url.openStream()));
      String line;
      while ((line = in.readLine()) != null) {
        System.out.println("> " + line);
     }
      in.close();
    } catch(MalformedURLException mue) { // URL constructor
        System.out.println(args[0] + "is an invalid URL: " + mue);
    } catch(IOException ioe) { // Stream constructors
      System.out.println("IOException: " + ioe);
    }
  }

  private static void checkUsage(String[] args) {
    if (args.length != 1) {
      System.out.println("Usage: UrlRetriever2 ");
      System.exit(-1);
    }
  }
}

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UrlRetriever.java  Accepts an URL from the command line, parses the host, port, and URI components from the URL and then retrieves the document. Requires the following classes: 


import java.util.*;

/** This parses the input to get a host, port, and file, then
 *  passes these three values to the UriRetriever class to
 *  grab the URL from the Web.
 *
 *  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 UrlRetriever {
  public static void main(String[] args) {
    checkUsage(args);
    StringTokenizer tok = new StringTokenizer(args[0]);
    String protocol = tok.nextToken(":");
    checkProtocol(protocol);
    String host = tok.nextToken(":/");
    String uri;
    int port = 80;
    try {
      uri = tok.nextToken("");
      if (uri.charAt(0) == ':') {
        tok = new StringTokenizer(uri);
        port = Integer.parseInt(tok.nextToken(":/"));
        uri = tok.nextToken("");
      }
    } catch(NoSuchElementException nsee) {
      uri = "/";
    }
    UriRetriever uriClient = new UriRetriever(host, port, uri);
    uriClient.connect();
  }

  /** Warn user if the URL was forgotten. */

  private static void checkUsage(String[] args) {
    if (args.length != 1) {
      System.out.println("Usage: UrlRetriever ");
      System.exit(-1);
    }
  }

  /** Tell user that this can only handle HTTP. */

  private static void checkProtocol(String protocol) {
    if (!protocol.equals("http")) {
      System.out.println("Don't understand protocol " + protocol);
      System.exit(-1);
    }
  }
}




UriRetriever.java  Given a host, port, and URI, retrieves the document from the HTTP server. 

import java.net.*;
import java.io.*;

/** Retrieve a URL given the host, port, and file as three 
 *  separate command-line arguments. A later class 
 *  (UrlRetriever) supports a single URL instead.
 *
 *  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 UriRetriever extends NetworkClient {
  private String uri;

  public static void main(String[] args) {
    UriRetriever uriClient
      = new UriRetriever(args[0], Integer.parseInt(args[1]),
                         args[2]);
    uriClient.connect();
  }

  public UriRetriever(String host, int port, String uri) {
    super(host, port); 
    this.uri = uri;
  }

  /** Send one GET line, then read the results one line at a
   *  time, printing each to standard output.
   */

  // It is safe to use blocking IO (readLine), since
  // HTTP servers close connection when done, resulting
  // in a null value for readLine.
  
  protected void handleConnection(Socket uriSocket)
      throws IOException {
    PrintWriter out = SocketUtil.getWriter(uriSocket);
    BufferedReader in = SocketUtil.getReader(uriSocket);
    out.println("GET " + uri + " HTTP/1.0rn");
    String line;
    while ((line = in.readLine()) != null) {
      System.out.println("> " + line);
    }
  }
}





NetworkClient.java

import java.net.*;
import java.io.*;

/** A starting point for network clients. You'll need to
 *  override handleConnection, but in many cases connect can
 *  remain unchanged. It uses SocketUtil to simplify the
 *  creation of the PrintWriter and BufferedReader.
 *
 *  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 NetworkClient {
  protected String host;
  protected int port;

  /** Register host and port. The connection won't
   *  actually be established until you call
   *  connect.
   */

  public NetworkClient(String host, int port) {
    this.host = host;
    this.port = port;
  }

  /** Establishes the connection, then passes the socket
   *  to handleConnection.
   */

  public void connect() {
    try {
      Socket client = new Socket(host, port);
      handleConnection(client);
    } catch(UnknownHostException uhe) {
      System.out.println("Unknown host: " + host);
      uhe.printStackTrace();
    } catch(IOException ioe) {
      System.out.println("IOException: " + ioe);
      ioe.printStackTrace();
    }
  }

  /** This is the method you will override when
   *  making a network client for your task.
   *  The default version sends a single line
   *  ("Generic Network Client") to the server,
   *  reads one line of response, prints it, then exits.
   */

  protected void handleConnection(Socket client)
    throws IOException {
    PrintWriter out = SocketUtil.getWriter(client);
    BufferedReader in = SocketUtil.getReader(client);
    out.println("Generic Network Client");
    System.out.println
      ("Generic Network Client:n" +
       "Made connection to " + host +
       " and got '" + in.readLine() + "' in response");
    client.close();
  }

  /** The hostname of the server we're contacting. */

  public String getHost() {
    return(host);
  }

  /** The port connection will be made on. */

  public int getPort() {
    return(port);
  }
}

SocketUtil.java  Provides utilities for wrapping a BufferedReader  and PrintWriter around the Socket's input and output streams, respectively. 

import java.net.*;
import java.io.*;

/** A shorthand way to create BufferedReaders and
 *  PrintWriters associated with a Socket.
 *
 *  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 SocketUtil {
  /** Make a BufferedReader to get incoming data. */

  public static BufferedReader getReader(Socket s)
      throws IOException {
    return(new BufferedReader(
       new InputStreamReader(s.getInputStream())));
  }

  /** Make a PrintWriter to send outgoing data.
   *  This PrintWriter will automatically flush stream
   *  when println is called.
   */

  public static PrintWriter getWriter(Socket s)
      throws IOException {
    // Second argument of true means autoflush.
    return(new PrintWriter(s.getOutputStream(), true));
  }
}

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AddressVerifier.java  Connects to an SMTP server and issues a expn request to display details about a mailbox on the server. Uses the following classes: 

import java.net.*;
import java.io.*;

/** Given an e-mail address of the form user@host,
 *  connect to port 25 of the host and issue an
 *  'expn' request for the user. Print the results.
 *
 *  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 AddressVerifier extends NetworkClient {
  private String username;

  public static void main(String[] args) {
    if (args.length != 1) {
      usage();
   }
    MailAddress address = new MailAddress(args[0]);
    AddressVerifier verifier
      = new AddressVerifier(address.getUsername(),
                            address.getHostname(), 25);
    verifier.connect();
  }

  public AddressVerifier(String username, String hostname,
                         int port) {
    super(hostname, port);
    this.username = username;
  }

  /** NetworkClient, the parent class, automatically establishes
   *  the connection and then passes the Socket to
   *  handleConnection. This method does all the real work
   *  of talking to the mail server.
   */

  // You can't use readLine, because it blocks. Blocking I/O
  // by readLine is only appropriate when you know how many
  // lines to read. Note that mail servers send a varying
  // number of lines when you first connect or send no line
  // closing the connection (as HTTP servers do), yielding
  // null for readLine. Also, we'll assume that 1000 bytes
  // is more than enough to handle any server welcome
  // message and the actual EXPN response.

  protected void handleConnection(Socket client) {
    try {
      PrintWriter out = SocketUtil.getWriter(client);
      InputStream in = client.getInputStream();
      byte[] response = new byte[1000];
      // Clear out mail server's welcome message.
      in.read(response);
      out.println("EXPN " + username);
      // Read the response to the EXPN command.
      int numBytes = in.read(response);
      // The 0 means to use normal ASCII encoding.
      System.out.write(response, 0, numBytes);
      out.println("QUIT");
      client.close();
    } catch(IOException ioe) {
      System.out.println("Couldn't make connection: " + ioe);
    }
  }

  /** If the wrong arguments, thn warn user. */

  public static void usage() {
    System.out.println ("You must supply an email address " +
       "of the form 'username@hostname'.");
    System.exit(-1);
  }
}


MailAddress.java  Separates the user and host components of an email address. 

import java.util.*;

/** Takes a string of the form "user@host" and
 *  separates it into the "user" and "host" parts.
 *
 *  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 MailAddress {
  private String username, hostname;

  public MailAddress(String emailAddress) {
    StringTokenizer tokenizer
      = new StringTokenizer(emailAddress, "@");
    this.username = getArg(tokenizer);
    this.hostname = getArg(tokenizer);
  }

  private static String getArg(StringTokenizer tok) {
    try { return(tok.nextToken()); }
    catch (NoSuchElementException nsee) {
      System.out.println("Illegal email address");
      System.exit(-1);
      return(null);
    }
  }

  public String getUsername() {
    return(username);
  }

  public String getHostname() {
    return(hostname);
  }
}


NetworkClient.java  Starting point for a network client to communicate with a remote computer.

import java.net.*;
import java.io.*;

/** A starting point for network clients. You'll need to
 *  override handleConnection, but in many cases connect can
 *  remain unchanged. It uses SocketUtil to simplify the
 *  creation of the PrintWriter and BufferedReader.
 *
 *  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 NetworkClient {
  protected String host;
  protected int port;

  /** Register host and port. The connection won't
   *  actually be established until you call
   *  connect.
   */

  public NetworkClient(String host, int port) {
    this.host = host;
    this.port = port;
  }

  /** Establishes the connection, then passes the socket
   *  to handleConnection.
   */

  public void connect() {
    try {
      Socket client = new Socket(host, port);
      handleConnection(client);
    } catch(UnknownHostException uhe) {
      System.out.println("Unknown host: " + host);
      uhe.printStackTrace();
    } catch(IOException ioe) {
      System.out.println("IOException: " + ioe);
      ioe.printStackTrace();
    }
  }

  /** This is the method you will override when
   *  making a network client for your task.
   *  The default version sends a single line
   *  ("Generic Network Client") to the server,
   *  reads one line of response, prints it, then exits.
   */

  protected void handleConnection(Socket client)
    throws IOException {
    PrintWriter out = SocketUtil.getWriter(client);
    BufferedReader in = SocketUtil.getReader(client);
    out.println("Generic Network Client");
    System.out.println
      ("Generic Network Client:n" +
       "Made connection to " + host +
       " and got '" + in.readLine() + "' in response");
    client.close();
  }

  /** The hostname of the server we're contacting. */

  public String getHost() {
    return(host);
  }

  /** The port connection will be made on. */

  public int getPort() {
    return(port);
  }
}


SocketUtil.java  Provides utilities for wrapping a BufferedReader  and PrintWriter around the Socket's input and output streams, respectively. 

import java.net.*;
import java.io.*;

/** A shorthand way to create BufferedReaders and
 *  PrintWriters associated with a Socket.
 *
 *  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 SocketUtil {
  /** Make a BufferedReader to get incoming data. */

  public static BufferedReader getReader(Socket s)
      throws IOException {
    return(new BufferedReader(
       new InputStreamReader(s.getInputStream())));
  }

  /** Make a PrintWriter to send outgoing data.
   *  This PrintWriter will automatically flush stream
   *  when println is called.
   */

  public static PrintWriter getWriter(Socket s)
      throws IOException {
    // Second argument of true means autoflush.
    return(new PrintWriter(s.getOutputStream(), true));
  }
}

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SplitTest.java  Illustrates parsing a string with a String.split


/** Prints the tokens resulting from treating the first
 *  command-line argument as the string to be tokenized
 *  and the second as the delimiter set. Uses
 *  String.split instead of StringTokenizer.
 */

public class SplitTest {
  public static void main(String[] args) {
    if (args.length == 2) {
      String input = args[0], delimiters = args[1];
      String[] tokens = args[0].split(delimiters);
      for(int i=0; i<tokens .length; i++) {
        String token = tokens[i];
        if (token.length() != 0) {
          System.out.println(token);
        }
      }
    } else {
      System.out.println
        ("Usage: java SplitTest string delimeters");
    }
  }
}

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TokTest.java  Illustrates parsing a string with a StringTokenizer. 

import java.util.StringTokenizer;

/** Prints the tokens resulting from treating the first
 *  command-line argument as the string to be tokenized
 *  and the second as the delimiter set.
 *
 *  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 TokTest {
  public static void main(String[] args) {
    if (args.length == 2) {
      String input = args[0], delimiters = args[1];
      StringTokenizer tok =
        new StringTokenizer(input, delimiters);
      while (tok.hasMoreTokens()) {
        System.out.println(tok.nextToken());
      }
    } else {
      System.out.println
        ("Usage: java TokTest string delimeters");
    }
  }
}

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NetworkClientTest.java  Makes a simple connection to the host and port specified on the command line. Uses the following classes:

/** Make simple connection to host and port specified.
 *
 *  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 NetworkClientTest {
  public static void main(String[] args) {
    String host = "localhost";
    int port = 8088;
    if (args.length > 0) {
      host = args[0];
    }
    if (args.length > 1) {
      port = Integer.parseInt(args[1]);
    }
    NetworkClient nwClient = new NetworkClient(host, port);
    nwClient.connect();
  }
}



NetworkClient.java  Starting point for a network client to communicate with a remote computer.

import java.net.*;
import java.io.*;

/** A starting point for network clients. You'll need to
 *  override handleConnection, but in many cases connect can
 *  remain unchanged. It uses SocketUtil to simplify the
 *  creation of the PrintWriter and BufferedReader.
 *
 *  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 NetworkClient {
  protected String host;
  protected int port;

  /** Register host and port. The connection won't
   *  actually be established until you call
   *  connect.
   */

  public NetworkClient(String host, int port) {
    this.host = host;
    this.port = port;
  }

  /** Establishes the connection, then passes the socket
   *  to handleConnection.
   */

  public void connect() {
    try {
      Socket client = new Socket(host, port);
      handleConnection(client);
    } catch(UnknownHostException uhe) {
      System.out.println("Unknown host: " + host);
      uhe.printStackTrace();
    } catch(IOException ioe) {
      System.out.println("IOException: " + ioe);
      ioe.printStackTrace();
    }
  }

  /** This is the method you will override when
   *  making a network client for your task.
   *  The default version sends a single line
   *  ("Generic Network Client") to the server,
   *  reads one line of response, prints it, then exits.
   */

  protected void handleConnection(Socket client)
    throws IOException {
    PrintWriter out = SocketUtil.getWriter(client);
    BufferedReader in = SocketUtil.getReader(client);
    out.println("Generic Network Client");
    System.out.println
      ("Generic Network Client:n" +
       "Made connection to " + host +
       " and got '" + in.readLine() + "' in response");
    client.close();
  }

  /** The hostname of the server we're contacting. */

  public String getHost() {
    return(host);
  }

  /** The port connection will be made on. */

  public int getPort() {
    return(port);
  }
}


SocketUtil.java  Provides utilities for wrapping a BufferedReader around the Socket's input stream and a PrintWriter  around the Socket's output stream

import java.net.*;
import java.io.*;

/** A shorthand way to create BufferedReaders and
 *  PrintWriters associated with a Socket.
 *
 *  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 SocketUtil {
  /** Make a BufferedReader to get incoming data. */

  public static BufferedReader getReader(Socket s)
      throws IOException {
    return(new BufferedReader(
       new InputStreamReader(s.getInputStream())));
  }

  /** Make a PrintWriter to send outgoing data.
   *  This PrintWriter will automatically flush stream
   *  when println is called.
   */

  public static PrintWriter getWriter(Socket s)
      throws IOException {
    // Second argument of true means autoflush.
    return(new PrintWriter(s.getOutputStream(), true));
  }
}

 

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*/

public class Statics {
 public static void main(String[] args) {
    staticMethod();
    Statics s1 = new Statics();
    s1.regularMethod();
  }

  public static void staticMethod() {
    System.out.println("This is a static method.");
  }

  public void regularMethod() {
    System.out.println("This is a regular method.");
  }
}

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Categories:Programming Code Examples, Java/J2EE/J2ME, Object Oriented Programming
Tags:Java/J2EE/J2MEObject Oriented Programming
Post Data:2017-01-02 16:04:39

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&&&&&&&&&&&&&&&&&&&
Example demonstrating the use of packages.

    * Class1.java defined in package1.
    * Class2.java defined in package2.
    * Class3.java defined in package2.package3.
    * Class1.java defined in package4.
    * PackageExample.java Driver for package example
&&&&&&&&&&&&&&&&&&&&&
~~~~~~~~~~~~~~~~~~~~~
Class1.java defined in package1.
~~~~~~~~~~~~~~~~~~~~~
package package1;

*****************
 
public class Class1 {
  public static void printInfo() {
    System.out.println("This is Class1 in package1.");
  }
}
&&&&&&&&&&&&&&&&&&&&&
~~~~~~~~~~~~~~~~~~~~~
Class2.java defined in package2. 
~~~~~~~~~~~~~~~~~~~~~
package package2;
$$$$$$$$$$$$$$$$

public class Class2 {
  public static void printInfo() {
    System.out.println("This is Class2 in package2.");
  }
}
&&&&&&&&&&&&&&&&&&&&&&
~~~~~~~~~~~~~~~~~~~~~~
Class3.java defined in package2.package3
~~~~~~~~~~~~~~~~~~~~~~
package package2.package3;

@@@@@@@@@@@@@@@@@@@@@@@@@

public class Class3 {
  public static void printInfo() {
    System.out.println("This is Class3 in " +
                       "package2.package3.");
  }
}
&&&&&&&&&&&&&&&&&&&&&&&&&
~~~~~~~~~~~~~~~~~~~~~~~~~
Class1.java defined in package4.
~~~~~~~~~~~~~~~~~~~~~~~~~
package package4;

@@@@@@@@@@@@@@@@

public class Class1 {
  public static void printInfo() {
    System.out.println("This is Class1 in package4.");
  }
}
&&&&&&&&&&&&&&&&&&&&&&&&&&
~~~~~~~~~~~~~~~~~~~~~~~~~~
PackageExample.java Driver for package example.
~~~~~~~~~~~~~~~~~~~~~~~~~~
import package1.*;
import package2.Class2;
import package2.package3.*;

***************************

public class PackageExample {
  public static void main(String[] args) {
    Class1.printInfo();
    Class2.printInfo();
    Class3.printInfo();
    package4.Class1.printInfo();
  }
}
****************************

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10395
Categories:Programming Code Examples, Java/J2EE/J2ME, Object Oriented Programming
Tags:Java/J2EE/J2MEObject Oriented Programming
Post Data:2017-01-02 16:04:39

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***********************************
# 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.
    * Circle.java A circle that extends Shape and implements Measurable.
    * MeasureUtil.java Operates on Measurable instances.
    * Polygon.java A closed Shape with straight edges; extends StraightEdgedShape and implements Measurable.
    * Rectangle.java A rectangle that satisfies the Measurable interface; extends Polygon.
    * MeasureTest.java Driver for example.
**************************************
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Shape.java 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/** The parent class for all closed, open, curved, and 
 *  straight-edged shapes.
 *
 ############################
public abstract class Shape {
  protected int x, y;

  public int getX() {
    return(x);
  }

  public void setX(int x) {
    this.x = x;
  }

  public int getY() {
    return(y);
  }

  public void setY(int y) {
    this.y = y;
  }
}
#############################
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Curve.java An (abstract) curved Shape (open or closed)
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/** A curved shape (open or closed). Subclasses will include
 *  arcs and circles.
 *
***********************

public abstract class Curve extends Shape {}
##############################
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
StraightEdgedShape.java A Shape with straight edges (open or closed). 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/** A Shape with straight edges (open or closed). Subclasses
 *  will include Line, LineSegment, LinkedLineSegments,
 *  and Polygon.
 *
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
public abstract class StraightEdgedShape extends Shape {}
################################
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Measurable.java Interface defining classes with measurable areas
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/** Used in classes with measurable areas. 
 *
 **************

public interface Measurable {
  double getArea();
}
#################################
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Circle.java A circle that extends Shape and implements Measurable.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/** A circle. Since you can calculate the area of
 *  circles, class implements the Measurable interface.
 *
***********************************
public class Circle extends Curve implements Measurable {
  private double radius;

  public Circle(int x, int y, double radius) {
    setX(x);
    setY(y);
    setRadius(radius);
  }

  public double getRadius() {
    return(radius);
  }

  public void setRadius(double radius) {
    this.radius = radius;
  }

  /** Required for Measurable interface. */

  public double getArea() {
    return(Math.PI * radius * radius);
  }
}
############################
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
MeasureUtil.java Operates on Measurable instances
~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/** Some operations on Measurable instances. 
 *

************************
public class MeasureUtil {
  public static double maxArea(Measurable m1,
                               Measurable m2) {
    return(Math.max(m1.getArea(), m2.getArea()));
  }

  public static double totalArea(Measurable[] mArray) {
    double total = 0;
    for(int i=0; i<marray .length; i++) {
      total = total + mArray[i].getArea();
    }
    return(total);
  }
}
#########################
~~~~~~~~~~~~~~~~~~~~~~~~~
Polygon.java A closed Shape with straight edges; extends StraightEdgedShape and implements Measurable.
~~~~~~~~~~~~~~~~~~~~~~~~~
/** A closed Shape with straight edges. 
 *
***************************************

public abstract class Polygon extends StraightEdgedShape
                              implements Measurable {
  private int numSides;

  public int getNumSides() {
    return(numSides);
  }

  protected void setNumSides(int numSides) {
    this.numSides = numSides;
  }
}
###########################
~~~~~~~~~~~~~~~~~~~~~~~~~~~
Rectangle.java A rectangle that satisfies the Measurable interface; extends Polygon.
~~~~~~~~~~~~~~~~~~~~~~~~~~~
/** A rectangle implements the getArea method. This satisfies 
 *  the Measurable interface, so rectangles can be instantiated.
 *
*****************************

public class Rectangle extends Polygon {
  private double width, height;
  
  public Rectangle(int x, int y, 
                   double width, double height) {
    setNumSides(2);
    setX(x);
    setY(y);
    setWidth(width);
    setHeight(height);
  }

  public double getWidth() {
    return(width);
  }

  public void setWidth(double width) {
    this.width = width;
  }

  public double getHeight() {
    return(height);
  }

  public void setHeight(double height) {
    this.height = height;
  }

  /** Required to implement Measurable interface. */

  public double getArea() {
    return(width * height);
  }
}
##########################
~~~~~~~~~~~~~~~~~~~~~~~~~~
MeasureTest.java Driver for example.
~~~~~~~~~~~~~~~~~~~~~~~~~~
/** Test of MeasureUtil. Note that we could change the 
 *  actual classes of elements in the measurables array (as
 *  long as they implemented Measurable) without changing
 *  the rest of the code.
 ************************
public class MeasureTest {
  public static void main(String[] args) {
    Measurable[] measurables =
      { new Rectangle(0, 0, 5.0, 10.0),
        new Rectangle(0, 0, 4.0, 9.0),
        new Circle(0, 0, 4.0),
        new Circle(0, 0, 5.0) };
    System.out.print("Areas:");
    for(int i=0; i<measurables.length; i++)
      System.out.print(" " + measurables[i].getArea());
    System.out.println();
    System.out.println("Larger of 1st, 3rd: " +
       MeasureUtil.maxArea(measurables[0],
                     measurables[2]) +
                     "nTotal area: " +
                     MeasureUtil.totalArea(measurables));
  }
}
@@@@@@@@@@@@@@@@@@@@@@@@
~~~~~~~~~~~~~~~~~~~~~~~

~~~~~~~~~~~~~~~~~~~~~~

Note: Brought from our old site: http://www.salearningschool.com/example_codes/ on Jan 2nd, 2017 From: http://sitestree.com/?p=10394
Categories:Programming Code Examples, Java/J2EE/J2ME, Object Oriented Programming
Tags:Java/J2EE/J2MEObject Oriented Programming
Post Data:2017-01-02 16:04:39

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