Finding the Public Data Fields of an Object :: Calling Java from MATLAB (External Interfaces)

External Interfaces

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