User`s manual

5 Calling Java from MATLAB

5-52

The three calls to put from the preceding example can be rewritten as

hTable.put(0, 1);

hTable.put(1, 41.287);

hTable.put(2, 'test string');

Passing Objects in an Array

The only types of Java object arrays that you can pass to Java methods are

Java arrays and MATLAB cell arrays.

If the objects have already been placed into an array, either an array returned

from a Java constructor or constructed in MATLAB by the

javaArray function,

then you simply pass it as is in the argument to the method being called. No

conversion is done by MATLAB, as this is already a Java array.

If you have objects that are not already in a Java array, then MATLAB allows

you to simply pass them in a MATLAB cell array. In this case, MATLAB

converts the cell array to a Java array prior to passing the argument.

The following example shows the

mapPoints method of a user-written class

accepting an array of class

java.awt.Point. The method declaration for this is

public Object mapPoints(java.awt.Point p[])

The MATLAB code shown below creates a 2-by-2 cell array containing four

Java Point objects. When the cell array is passed to the

mapPoints method,

MATLAB converts it to a Java array of type

java.awt.Point.

pointObj1 = java.awt.Point(25,143);

pointObj2 = java.awt.Point(31,147);

pointObj3 = java.awt.Point(49,151);

pointObj4 = java.awt.Point(52,176);

cellArray={pointObj1, pointObj2; pointObj3, pointObj4}

cellArray =

[1x1 java.awt.Point] [1x1 java.awt.Point]

testData.mapPoints(cellArray);