MATLAB REAL-TIME WORKSHOP 7 - TARGET LANGUAGE COMPILER Manual de usuario descargar pdf (Pagina 181)

100

101

Creating and Using Java Objects

5-11

class, class_name, with the argument list that matches x1,...,xn, and

returns a new object,

J = javaObject('class_name',x1,...,xn);

For example, to construct and return a Java object of class java.lang.String,

you use

strObj = javaObject('java.lang.String','hello');

Using the javaObject function enables you to:

•Use classes having names with more than 31 consecutive characters

•Specify the class for an object at run-time, for example, as input from an

application user

The default MATLAB constructor syntax requires that no segment of the input

class name be longer than 31 characters. (A class name segment is any portion

of the class name before, between, or after a dot. For example, there are three

segments in class,

java.lang.String.) Any class name segment that exceeds

31 characters is truncated by MATLAB. In the rare case where you need to use

a class name of this length, you must use

javaObject to instantiate the class.

The

javaObject function also allows you to specify the Java class for the object

being constructed at run-time. In this situation, you call

javaObject with a

string variable in place of the class name argument.

class = 'java.lang.String';

text = 'hello';

strObj = javaObject(class, text);

In the usual case, when the class to instantiate is known at development time,

it is more convenient to use the MATLAB constructor syntax. For example, to

create a

java.lang.String object, you would use

strObj = java.lang.String('hello');

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