how to passs output of Java program to m-file

Hello folks,

I have written a Java program which is invoked using system() function, thus it runs on the command window of Matlab. Now I want to know if there's another way to run a Java program other than running it on command window? Can it be run on any user made GUI in Matlab? Another problem is, I want to know if my program has some string value as output, which is generally displayed on command window, how can i store it in variable in Matlab?

Hope to hear from you very soon.

Answer 1

[Kaustubha Govind]

Need http://www.mathworks.com/matlabcentral/answers/6920-how-to-invoke-java-program-from-matlab and http://www.mathworks.com/matlabcentral/answers/6923-calling-a-java-class-from-matlab

The section Handling Data Returned from a Java Method specifically addresses your question.

[Neha]

Thank u Kaustubha.

all help that is available deals with Matlab language using Java objects. My trouble is to directly use java class in Matlab.

I have followed pre requisites, have added root directory to classpath and set all required environment variables. But I don't know how to call my java program or .class file.

Plus, there's question of how to handle data returned from this program.

Hope to hear from u very soon.

U can also contact me directly @ [e-mail]

[Kaustubha Govind]

Richard has an example usage on http://www.mathworks.com/matlabcentral/answers/6923-calling-a-java-class-from-matlab

Once you have added your Java class directory to the classpath, simple instantiate that class in MATLAB.

[Neha]

Hey Kautubha,

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.

[Kaustubha Govind]

What is the error that you see?

[Jose Cruz]

Hello, im currently having the same issue as the above fellow. I use the command javaaddpath, with the path to the .class file which i want to call a method from, and it gives me the following error

>> javaaddpath('C:\testeTobii\bin\tobii\Tobii.class');

>> o = Tobii;

Unrecognized function or variable 'Tobii'.

I have already tried to insert the path on "classpath.txt" file and creating a java file "javaclasspath.txt" placing it inside the prefdir of Matlab.