PHP and Java (ii)

Author: Well Middle Moon

Example 1: Creating and using your own Java class
It is easy to create your own Java class. Create a new Phptest.java file and place it in your Java.class.path directory, which reads as follows:

public class phptest{
/**
* A sample of a class that can work with PHP
* Nb:the whole class must to work,
* And of course the methods you wish to call
* directly.
*
* Also Note this from PHP's Main method
* Won't be called
*/

Public String foo;

/**
* Takes a string and returns the result
* or a msg saying your string was empty
*/
public string Test (string str) {
if (Str.equals ("")) {
str = "Your string was empty.";
}
return str;
}

/**
* Whatisfoo () simply returns the value of the variable foo.
*/
Public String Whatisfoo () {
Return ' foo is ' + foo;
}


/**
* This is called if phptest be run from the command line with
* Something like
* Java phptest
* OR
* Java phptest Hello there
*/
public static void Main (String args[]) {
Phptest p = new Phptest ();

if (Args.length = = 0) {
String arg = "";
System.out.println (ARG) (p.test);
}else{
for (int i=0 i < args.length; i++) {
String arg = args[i];
System.out.println (ARG) (p.test);
}
}
}
}

After creating this file, we will compile this file and use Javac Phptest.java This command at the DOS command line.

To test this Java class using PHP, we create a phptest.php file that reads as follows:


$myj = new Java ("Phptest");
echo "Test Results are". $myj->test ("Hello World"). "";

$myj->foo = "A String Value";
echo "You have set Foo to". $myj->foo. "
n ";
echo "My Java Method reports:". $myj->whatisfoo (). "
n ";

?>

If you get such a warning message: java.lang.ClassNotFoundException error, this means that your Phptest.class file is not in your Java.class.path directory.
Note that Java is a mandatory type language, and PHP is not, so that when we merge them, it is easy to cause errors, so when we are passing variables to Java, we need to correctly specify the type of the variable. such as: $myj->foo = (string) 12345678; or $myj->foo = "12345678";

This is just a small example where you can create your own Java class and use PHP to call it well!