External Interfaces/API

Finding the Public Data Fields of an Object

To list the public fields that belong to a Java object, use the fieldnames function, which takes either of these forms.

• names = fieldnames(obj)
  names = fieldnames(obj,'-full')
  

Calling fieldnames without '-full' returns the names of all the data fields (including inherited) on the object. With the '-full' qualifier, fieldnames returns the full description of the data fields defined for the object, including type, attributes, and inheritance information.

Suppose, for example, that you constructed a Frame object with

• frame = java.awt.Frame;
  

To obtain the full description of the data fields on frame, you could use the command

• fieldnames(frame,'-full')
  

Sample output from this command follows.

• ans = 
  'static final int WIDTH
      % Inherited from java.awt.image.ImageObserver'
  'static final int HEIGHT
      % Inherited from java.awt.image.ImageObserver'
  [1x74 char]
  'static final int SOMEBITS
      % Inherited from java.awt.image.ImageObserver'
  'static final int FRAMEBITS
      % Inherited from java.awt.image.ImageObserver'
  'static final int ALLBITS
      % Inherited from java.awt.image.ImageObserver'
  'static final int ERROR
      % Inherited from java.awt.image.ImageObserver'
  'static final int ABORT
      % Inherited from java.awt.image.ImageObserver'
  'static final float TOP_ALIGNMENT
      % Inherited from java.awt.Component'
  'static final float CENTER_ALIGNMENT
      % Inherited from java.awt.Component'
  'static final float BOTTOM_ALIGNMENT
      % Inherited from java.awt.Component'
  'static final float LEFT_ALIGNMENT
      % Inherited from java.awt.Component'
  'static final float RIGHT_ALIGNMENT
      % Inherited from java.awt.Component'
  .
  .
  .
  

Saving and Loading Java Objects to MAT-Files

Accessing Private and Public Data