MATLAB BUILDER JA 2 User's Guide download pdf (Page 31)

Understanding the Magic Square Example

The Magic Square example shows the following aspects of writing an

application using components created by MATLAB Builder for Java:

• “Importing Classes” on page 1-23

• “Creating an Instance of the Class” on page 1-23

• “Calling Class Methods from Java” on page 1-23

Importing Classes

You must import the MATLAB libraries and your own Java classes into your

code. Use the Java

import function to do this.

For the

magicsquare example, the following statements perform the

necessary actions:

import com.mathworks.toolbox.javabuilder.*;

import magicsquare.*;

Creating an Instance of the Class

As with all Java classes, you must use the new function to create an instance

of a class. To create an object (

theMagic)fromthemagic class, the example

applicat ion uses the following code:

theMagic = new magic();

Calling Class Methods from Java

Once you have instantiated the class, you can call a class method as you do

with any Java object. In the Magic Square example, the

makesqr method is

called as show n:

result = theMagic.makesqr(1, n);

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MATLAB BUILDER JA 2 User's Guide Page 31