External Interfaces

Saving and Loading Java Objects to MAT-Files

Use the MATLAB save function to save a Java object to a MAT-file. Use the load function to load it back into MATLAB from that MAT-file. To save a Java object to a MAT-file, and to load the object from the MAT-file, make sure that the object and its class meet all of the following criteria:

• The class implements the Serializable interface (part of the Java API), either directly or by inheriting it from a parent class. Any embedded or otherwise referenced objects must also implement Serializable.
• The definition of the class is not changed between saving and loading the object. Any change to the data fields or methods of a class prevents the loading (deserialization) of an object that was constructed with the old class definition.
• Either the class does not have any transient data fields, or the values in transient data fields of the object to be saved are not significant. Values in transient data fields are never saved with the object.

If you define your own Java classes, or subclasses of existing classes, you can follow the criteria above to enable objects of the class to be saved and loaded in MATLAB. For details on defining classes to support serialization, consult your Java development documentation. (See also To Learn More About Java Programming).

Concatenating Java Objects

Finding the Public Data Fields of an Object

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