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Java - php class

Third-party classes are used within a PHP application,
 I'll create a simple Java class that calculates 
sales tax based upon a price and taxation rate 
input by the user.

You'll need to compile salesTax.java using 
the Java compiler before you can use this class 
within the PHP script

import java.util.*;
import java.text.*;

public class SalesTax {

public String SalesTax(double price, double salesTax) 
{

    double tax = price * salesTax;

    NumberFormat numberFormatter;

    numberFormatter = NumberFormat.getCurrencyInstance();

    String priceOut = numberFormatter.format(price);

    String taxOut = numberFormatter.format(tax);

    numberFormatter = NumberFormat.getPercentInstance();

    String salesTaxOut = 
numberFormatter.format(salesTax);

    String str = "A sales Tax of " + salesTaxOut +

                 " on " + priceOut + " equals " + taxOut + ".";

    return str;

    }

}

file named salesTax.java, you'll need to compile it. 

a new, compiled file named salesTax.class
 will be created.

This is the compiled code that will be called by 
PHP to perform the calculation based on the data
 input by the user via an HTML form.

salesTaxInterface.php

<?php

// Format the HTML form.

$salesTaxForm = <<<SalesTaxForm

<form action="SalesTaxInterface.php" method="post">

   Price (ex. 42.56):<br>

   <input type="text" name="price" size="15" maxlength="15" value=""><br>

   Sales Tax rate (ex. 0.06):<br>

   <input type="text" name="tax" size="15" maxlength="15" value=""><br>

   <input type="submit" name="submit" 
value="Calculate!">

   </form>

SalesTaxForm;

if (! isset(
$submit)) :

   echo 
$salesTaxForm;

else :

   
// Instantiate the SalesTax class.
   
$salesTax = new Java("SalesTax");

   
// Don't forget to typecast in order to

   // conform with the Java method specifications.

   
$price = (double) $price;
   
$tax = (double) $tax;

   print 
$salesTax->SalesTax($price$tax);

endif;

?>

Troubleshooting

Chances are you will encounter various 
minor problems when you first attempt to integrate 
Java and PHP functionality, particularly if you are a 
relative newcomer to the Java programming 
environment. Even if the Java code compiles 
correctly, you may still encounter problems, 
largely due to differences found between the 
two languages. 

two of these differences here:

Data types

PHP is a loosely-typed language, which means it is
 rather lenient on the way variables are used. 
On the contrary, Java is a strongly-typed language,
 which means that its policies for handling 
variables and data types are rather stringent. 
To illustrate the problem this difference poses, 
take a moment to again review the code.
 Notice that I had to typecast the $price and 
$tax variables before passing them to the 
SalesTax() method, because this 
method requires that both input parameters
 are of type "double." If this is not done, then
 input such as 24 for price would cause an
 error to occur.

Furthermore, if you are not adamant in 
ensuring the correct data types are passed 
to the Java methods, you may receive 
unexpected results, although it will not be 
outwardly apparent that an error has occurred.
 Therefore, be careful!

Error reporting

Errors occurring within a PHP script are reported
 in accordance with the level of error-reporting
 specified in the php.ini file. Because the 
Java code is called from within the PHP script, 
any errors that arise from the Java code are 
displayed as PHP errors. If you would like to
 prevent these errors from being displayed 
to the browser, simply prefix a @ symbol to
 the PHP command.
2009-06-10 13:18:47
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