Can't import my java class into Matlab

Question

I'm trying to import a custom Java class into matlab. I found this SO Question that I followed.

I have the following Java code

package mypackage.release; public class TestArgu { public void addNumber(int aNumber){ ansNumber = aNumber+5; chk = aNumber; System.out.println("input number = " + chk + ".\n"); System.out.println("ans = " + ansNumber + ".\n"); } public int ansChk(){ return ansNumber; } private int ansNumber; private int chk; }

Then I compile with

javac TestArgu.java

I make sure I add the folder that contains the TestArgu.class with javaaddpath('.') file and try to call it with matlab.

>> a = mypackage.release.TestArgu(); Undefined variable "mypackage" or class "mypackage.release.TestArgu". >> import mypackage.release.*; >> a = TestArgu(); Undefined function or variable 'TestArgu'. >> a = mypackage.release.TestArgu.addNumber(1); Undefined variable "mypackage" or class "mypackage.release.TestArgu.addNumber".

I'm using the same version of java to compile that matlab uses. (JDK 7, Matlab 2013b)

Where am I going wrong ?

Try it: > a = mypackage.release.TestArgu.addNumber(1);

Sergey Morozov
– Sergey Morozov

2014-06-03 16:55:47 +00:00
Commented Jun 3, 2014 at 16:55 — Sergey Morozov
– Sergey Morozov, Commented Jun 3, 2014 at 16:55
Same thing, added it into the question.

Kassym Dorsel
– Kassym Dorsel

2014-06-03 17:07:30 +00:00
Commented Jun 3, 2014 at 17:07 — Kassym Dorsel
– Kassym Dorsel, Commented Jun 3, 2014 at 17:07

Geoff · Accepted Answer · 2014-06-03 18:29:52Z

I was able to reproduce the same behaviour with the code above. I think one problem is that there is no constructor for this class, so a=TestArgu() will fail. I suggest doing the following. Change the class definition by removing the package my package.release statement and adding a constructor to get

public class TestArgu { public TestArgu() { ansNumber = 0; chk = 0; } public void addNumber(int aNumber){ ansNumber = aNumber+5; chk = aNumber; System.out.println("input number = " + chk + ".\n"); System.out.println("ans = " + ansNumber + ".\n"); } public int ansChk(){ return ansNumber; } private int ansNumber; private int chk; }

Compile the code, as before

$ javac TestArgu.java

And then in MATLAB, add the path to wherever this compiled class exists

>> javaaddpath('/Users/geoff/Development/java'); % or wherever

Then instantiate the object

>> a = TestArgu a = TestArgu@2a307bb2

And try out the method

>> a.addNumber(37) input number = 37. ans = 42.

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