Here's a simple example that illustrates how to run a user-defined java class in MATLAB.

/*** Begin myExample.java ***/

class myExample {
   private double x;
   myExample(double newX) {
      x = newX;
   }
   public double getX() {
      return x;
   }
   public void setX(double newX) {
      x = newX;
   }
   public String toString() {
      return "### myExample: x = " +x +" ###";
   }
}

/***  End myExample.java  ***/

Compile myExample.java, and place the generated myExample.java file on MATLAB's classpath: see "Running your own class files in MATLAB" for details. Now, run it as follows:

» java on
» x = myExample(32);
» x.getX
ans =
    32
» x.setX(89)
» x.getX
ans =
    89
» x.setX(11)
» x.getX
ans =
    11
» 

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