How do I create an instance of a Java public static nested class from inside MATLAB 7.13 (R2011b)?

I have a class that contains a public static nested class. How do I create an instance of the static nested class in MATLAB v7.15 (R2011b)?

Answer 1

[MathWorks Support Team]

There are several ways this can be done. The following class Outer, which contains the public static nested class Inner, will be used to illustrate two possible ways:

 public class Outer { 

     public static class Inner {

         public int y;

         public Inner() {

             y = 1;

         }

         public Inner(int y) {

             this.y = y;

         }

     }

     public static Inner makeInner() {

         return new Inner();

     }

 }

• Add a public static method that returns a new instance of the inner class.

in = Outer.makeInner();

in.getClass().toString()

ans =

class Outer$Inner

• Use java.lang.Class.getClasses().

%%Create an Instance;

out = Outer(); 

%%Create a Class object

oc = out.getClass(); 

%%Create a Class[] containing  all the public classes defined within Outer.

oc_public = oc.getClasses();

%%Class object for Outer.Inner

inner_class =  oc_public(1); 

%%Call a zero argument constructor 

in1 = inner_class.newInstance();

%%Call a constructor with arguments

types = javaArray('java.lang.Class',1);

types(1) = java.lang.Integer.TYPE;

in2 = inner_class.getConstructor(types).newInstance(int32(5));