MATLAB: How to create an instance of a Java public static nested class from inside MATLAB 7.13 (R2011b)

Question

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

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));