MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuel d'utilisateur télécharger pdf (Page 186)

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5 Calling Java from MATLAB

5-16

'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'

Accessing Private and Public Data

Java API classes provide accessor methods you can use to read from and, where

allowed, to modify private data fields. These are sometimes referred to as get

and set methods, respectively.

Some Java classes have public data fields, which your code can read or modify

directly. To access these fields, use the syntax

object.field.

Examples

The java.awt.Frame class provides an example of access to both private and

public data fields. This class has the read accessor method

getSize, which

returns a

java.awt.Dimension object. The Dimension object has data fields

height and width, which are public and therefore directly accessible. The

following example shows MATLAB commands accessing this data.

frame = java.awt.Frame;

frameDim = getSize(frame);

height = frameDim.height;

frameDim.width = 42;

The programming examples in this chapter also contain calls to data field

accessors. For instance, the sample code for “Example – Finding an Internet

Protocol Address” on page 5-66 uses calls to accessors on a

java.net.InetAddress object.

hostname = address.getHostName;

ipaddress = address.getHostAddress;

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MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuel d'utilisateur Page 186

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