MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuel d'utilisateur télécharger pdf (Page 190)

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101

5 Calling Java from MATLAB

5-20

title = getTitle(frame)

title =

Sample Frame

All of the programming examples in this chapter contain invocations of Java

object methods. For example, the code for Reading a URL contains a call, using

MATLAB syntax, to the

openStream method on a java.net.URL object, url.

is = openStream(url)

In another example, the code for “Example – Creating and Using a Phone

Book” on page 5-73 contains a call, using Java syntax, to the

load method on a

java.utils.Properties object, pb_htable.

pb_htable.load(FIS);

Using the javaMethod Function on Nonstatic Methods

Under certain circumstances, you may need to use the javaMethod function to

call a Java method. The following syntax invokes the method,

method_name, on

Java object

J with the argument list that matches x1,...,xn. This returns the

value

X = javaMethod('method_name',J,x1,...,xn);

For example, to call the startsWith method on a java.lang.String object

passing one argument, use

gAddress = java.lang.String('Four score and seven years ago');

str = java.lang.String('Four score');

javaMethod('startsWith', gAddress, str)

ans =

Using the javaMethod function enables you to:

•Use methods having names longer than 31 characters

•Specify the method you want to invoke at run-time, for example, as input

from an application user

The only way to invoke a method whose name is longer than 31 characters is

to use

javaMethod. The Java and MATLAB calling syntax does not accept

method names of this length.

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MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manuel d'utilisateur Page 190

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