calling a java class from matlab

I have a java class, and I need to call it from matlab to implement a document. is that you have an idea?

Answer 1

[Richard Alcock]

It depends on whether it has been packaged into a .jar file or is a .class file.

Your class is called hello.HelloWorld

If it's in a file called c:\work\hello\HelloWorld.class, you need to add the root directory to the class path.

 javaaddpath c:\work\

 function Test()
  hello.HelloWorld();
 end

On the other hand, if it's in a c:\work\hello.jar file, you add the jar file to the class path.

 javaaddpath c:\work\hello.jar

After that's it's the same.

[najmaf najma]

I add the path and when I call:

{

% Construct an instance

obj = najmaf.Najma;

}

it gives me this error:

??? Undefined function or variable 'HelloWorld'.

[najmaf najma]

HelloWorld it's my class file

[Richard Alcock]

What is the full name of your class?

Is it in a jar file?

[najmaf najma]

No, is a simple Java class called: HelloWorld.class

this is the code:

{

package hello;

import java.lang.String;

public class HelloWorld {

//package mypack;

public String hello;

public HelloWorld() {

hello = "world";

}

}

}

i called this class from matlab with:

{

function Test()

test = HelloWorld();

end

}

it gives me the error:

{

??? Undefined function or variable 'HelloWorld'.

Error in ==> Test at 3

test = HelloWorld();

}

[najmaf najma]

do you have any suggestion???

[najmaf najma]

do you have any suggestion???

[Richard Alcock]

I've updated my answer.

[najmaf najma]

I received nothing.

I sent you the class with which I work with the error I received

[najmaf najma]

is that you can send me your reply again because I have not received the update that you did

[Neha]

Hey Richard,

I have this query I'm troubling since long with it.

I need to invoke a java class in Matlab, and need to store the returned string value in a variable in Mtalab. for this query i got following solution from a website, plz tell me where its going wrong:

>>

The Hello World solution by The MathWorks provides some insights on how to run a simple 'Hello World' java application inside MATLAB. You may change the Java code a bit, in order to have a method that returns a String.

public class HelloWorld

{

public String hello()

{

String helloWorld = "Hello World!";

return helloWorld;

}

}

Once this simple class is compiled and on the MATLAB JVM classpath create an instance and invoke the method with the following two commands.

o = HelloWorld

output = o.hello;

The String returned by the HelloWorld instance is assigned to the MATLAB variable output.

<<

The command described to invoke java code in matlab(ie o=HelloWorld) gives error.

[Richard Alcock]

I need some more information:

1. What is the full path to HelloWorld.class file?

2. What is the exact javaaddpath command you ran in MATLAB?

3. What error are you getting from MATLAB