How to write a wrapper class

I am new to the concept of wrapper classes. I have a small spell checker program that I need to access via a servlet by passing a string in and getting a string out with spelling suggestions. I could really use some advice on how to write a servlet that would do such a thing. TIA

grin1dan wrote:
I am new to the concept of wrapper classes. I have a small spell checker program that I need to access via a servlet by passing a string in and getting a string out with spelling suggestions. I could really use some advice on how to write a servlet that would do such a thing. TIABasically, a wrapper class is a class that "wraps" another - otherwise referred to as a "HAS-A" relationship (as opposed to a sub-class, which involves an "IS-A" relationship). It does this by including an instance of the wrapped class as one of its fields.
In many cases, wrapping is actually superior to inheritance.
I don't know how this fits with your servlet, but - assuming that your SpellChecker is implemented as a class - all you need to do is have your servlet define a "spellchecker" field; perhaps something like:
private final SpellChecker spellCheck = new SpellChecker();Probably worth reading up on though. Google "wrapper classes" and "forwarders".
Winston

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what about this:
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import javafx.beans.property.StringProperty;
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How to see the wrapper classes generated for CMP 2.1 in jdeveloper10g

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rgds,
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How to write c wrapper it containing callback functions

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a division of Test & Measurement Solutions

How do I create Wrapper class for Message Box?

I want to create Wrapper class for Message Box class in my project. I am using Telerik Testing FrameWork. In that message box was not recognized in unit testing thats y i want to create wrapper class, for creating the
instance for that mesage box.

A wrapper class is simply a class that for example wraps another object or a subset of its methods. You could just create a class that exposes the same methods as the MessageBox and uses the MessageBox internally.
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InitializeComponent();
_mbw = mbw;
private void SomeMethod()
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Please remember to close your threads by marking all helpful posts as answer and please start a new thread if you have a new question.

How to keep track of status using wrapper class?

Hi,
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No,
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Wrapper class

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(I can't compile it .I don't know how to write constructor in Initial Class

All class and main program is OK except the inital class.
Author Class
class Author {
private String authorName;
private Initials inits;
private int numTitles = 0;
// PRE True POST Prompts user for details
// and RETURNS new Author constructed from details
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System.out.print("\nSurname ==> ");
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Book Class
public class Book {
private String title;
private Author author;
// PRE TRUE // POST Prompts user for details
// and RETURNS new Author constructed from details
public Book(Author author, BufferedReader in) {
System.out.print("\nTitle ==> ");
title = Text.ReadString(in);
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author.incTitles();
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*****Initial Class (I can't compile it . I don't know how to write constructor
class Initials
{   private char[] inits;
     public Initials(BufferedReader in)
     System.out.print("\nInitails Testing ==> ");
     inits = Text.ReadString(in);
     public String toString()
          String result;
          result="Testing";
          return(result);
Main program
public class BookMain {
static private BufferedReader in = new BufferedReader(new                                    InputStreamReader(System.in));
public static void main(String[] args) {
Author authorRec1, authorRec2;
Book bookRec1, bookRec2;
System.out.println("\n\n****** First author input");
authorRec1 = new Author(in);
System.out.println("\n\n****** First author output\n" + authorRec1.toString());
System.out.println("\n\n****** Second author input");
authorRec2 = new Author(in);
System.out.println("\n\n****** Second author output\n" + authorRec2.toString());
     System.out.println("\n\n****** First book input");
bookRec1 = new Book(authorRec2, in);
System.out.println("\n\n****** First book output\n" + bookRec1.toString());
System.out.println("\n\n****** Second book input");
bookRec2 = new Book(authorRec2, in);
System.out.println("\n\n****** Second book output\n" + bookRec2.toString());
System.out.println("\n\n****** First book output\n" + bookRec1.toString());

Change this
class Initials {
private char[] inits;
to this
class Initials {
private String inits;
import java.io.*;
public class BookTest {
static private BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
public static void main(String[] args) {
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    Book bookRec1, bookRec2;
    System.out.println("\n\n****** First author input");
    authorRec1 = new Author(in);
    System.out.println("\n\n****** First author output\n" + authorRec1.toString());
    System.out.println("\n\n****** Second author input");
    authorRec2 = new Author(in);
    System.out.println("\n\n****** Second author output\n" + authorRec2.toString());
    System.out.println("\n\n****** First book input");
    bookRec1 = new Book(authorRec2, in);
    System.out.println("\n\n****** First book output\n" + bookRec1.toString());
    System.out.println("\n\n****** Second book input");
    bookRec2 = new Book(authorRec2, in);
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class Author {
private String authorName;
private Initials inits;
private int numTitles = 0;
// PRE True POST Prompts user for details
// and RETURNS new Author constructed from details
public Author(BufferedReader in) {
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    inits = new Initials(in);
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// PRE TRUE
// POST RETURNS String representation of Author
public String toString() {
    String result;
    result = "NAME : " + authorName + " " + inits.toString() + "\n";
    result = result + "Number of titles is " + numTitles;
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// PRE TRUE
// POST Increments number of titles
public void incTitles() {
    numTitles++;
class Book {
private String title;
private Author author;
// PRE TRUE // POST Prompts user for details
// and RETURNS new Author constructed from details
public Book(Author author, BufferedReader in) {
    System.out.print("\nTitle ==> ");
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    this.author = author;
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// PRE TRUE
// POST RETURNS String representation of Book
public String toString() {
    String result;
    result = "TITLE : " + title + "\n";
    result = result + "AUTHOR\n" + author.toString() + "\n";
    return(result);
class Initials {
private String inits;
public Initials(BufferedReader in) {
    System.out.print("\nInitails Testing ==> ");
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public String toString() {
    String result;
    result = inits;
    return(result);
class Text {
static String ReadString(BufferedReader in) {
    String text = "";
    try {
      text = in.readLine();
    catch (IOException e) {
      System.out.println(e.getMessage());
      System.exit(0);
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}

How to write hasCode() & equals(0) methods in Compound Key Class

Hi Java Helpdesk,
I am wondering how to write the hashCode() and equals() methods that is mandatory when creating composite
@IdClass. Below is the combination of primary @Id keys that I would like to make up in a compound key class:
public final class PatientKey implements java.io.Serializable
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    private String SurnameId;
    private String DateOfBirthID;
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Thanks,
Jack

Hi,
Thanks for your very brief response and I had a look at both EqualsBuilder and HashCodeBuilder from the URL links you have provided. These methods may improve the comparison accuracy but I was more interested on how to implement the equals() and hashCode methods when comparing 3 or more primary keys in order to make up a primary key class. Below is my first attempt to compose the PatientPK primary key class:
1. public class PatientPK implements java.io.Serializable {
2.
3.     private String firstName;
4.     private String lastName;
5.     private String dateOfBirth;
6.     private Char sex;
7.
8.     public PatientPK() {}
9.
10.   public PatientPK(String firstName, String lastName, Date dateOfBirth, Char sex)
11.   {
12.       this.firstName = firstName;
13.       this.lastName = lastName;
14.       this.dateOfBirth = dateOfBirth;
15.       this.sex = sex;
16.   }
17.
18.   public String getFirstName() { return this.firstName; }
19.   public void setFirstName(String firstname) { this.firstName = firstName; }
20.
21.   public String getlastName() { return this.lastName; }
22.   public void setLastname(String lastName) { this.lastName = lastName; }
23.
24.   public String getDateOfBirth() { return this.dateOfBirth; }
25.   public void setDateOfBirth(String dateOfBirth) { this.dateOfBirth = dateOfBirth; }
26.
27.   public Char getSex() { return this.sex; }
28.   public void setSex(String sex) { this.sex = sex; }
29.
30.   public boolean equals(Object obj)
31.   {
32.       if (obj == this) return true;
33.       if (!(obj instanceof PatientPK)) return false;
34.       PatientPK pk = (PatientPK) obj;
35.       if (!firstName.equals(pk.firstName)) return false;
36.       if (!lastName.equals(pk.lastName)) return false;
37.       if (!dateOfBirth.equals(pk.dateOfBirth)) return false;
38.       if (!sex.equals(pk.sex)) return false;
39.       return true;
40.   }
41.
42.   public hashCode()
43.   {
44.       return firstName.hashCode() + lastName.hashCode() + dateOfBirth.hashCode() + sex.hashCode();
45.   }
46.}Please advice whether both these equals() and hashCode() implementations are correct.
Thanks in advance,
Jack

How to write comments for a class

hi
how to write comments for a class

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public class arthOperation{
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How do I regenerate the JDBC wrapper class?

I am seeing the following in Weblogic 10.3.
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It should never not be in sync. It is generated dynamically according to the BI classes currently
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How do I write an external class with global constants?

Hi you all !
First I want to explain what exactly I want to do:
I have an application that should run in different resolutions. The app runs fullscreen, and I don't use Layouts or something, just a single Frame with a Graphics Object.
Now to handle the different resolutions, I want to write an external class with some constants to use. The usage in my main Class should be something like this:
public
class blah
private Constants myConstants;
public blah()
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else
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}or somthing like that. The important fact is that I can choose the constants at runtime and that I am NOT forced to use methods to get the values, cause something like
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Anybody out there who understood my problem and can help me??? PLEASE?
best regards,
Skippy

First, what's so much worse about
System.println(myConstants.getScreenWidth());
than
System.println(myConstants.ScreenWidth);
Is the extra five characters really that bad? (Note
you don't need the String.valueOf method call.)Well actually it was a wrong example I gave here, but it's not the call that makes me shake but the implementation:
public int screenWidth = 1024;vs.
public
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Second, why do you have methods that take five or more
parameters!?Well, maybe this example show up what I mean:
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Btw: Is it worth thinking about the time of execution like I did in this example? OO is a neat thing, but is it that fast?
I don't think isCursorInArea(new Rectangle(100,100,200,200),areaId) is such a great idea, but I might be wrong.
It sounds like you're trying to compound a bad design
with an even worse design for no good reason!Well, I'm not that experienced Java programmer to judge about that, but I (and my profs at university too) found my codes well structured and designed so far.
Skippy
PS: the string.valueOf(123) call came from cut&paste:
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How to write a wrapper class

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