External Interfaces/API

Invoking Static Methods on Java Classes

To invoke a static method on a Java class, use the Java invocation syntax

class.method(arg1,...,argn)

For example, call the isNaN static method on the java.lang.Double class.

java.lang.Double.isNaN(2.2)

Alternatively, you can apply static method names to instances of a class. In this example, the isNaN static method is referenced in relation to the dblObject instance of the java.lang.Double class.

dblObject = java.lang.Double(2.2);

dblObject.isNaN
ans =
     0

Several of the programming examples in this chapter contain examples of static method invocation. For example, the code for Communicating Through a Serial Port contains a call to static method getPortIdentifier on Java class javax.comm.CommPortIdentifier.

commPort = 
javax.comm.CommPortIdentifier.getPortIdentifier('COM1');

Using the javaMethod Function on Static Methods

The javaMethod function was introduced in section Using the javaMethod Function on Non-Static Methods. You can also use this function to call static methods.

The following syntax invokes the static method, method_name, in class, class_name, with the argument list that matches x1,...,xn. This returns the value X.

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

For example, to call the static isNaN method of the java.lang.Double class on a double value of 2.2, you use

javaMethod('isNaN','java.lang.Double',2.2);

Using the javaMethod function to call static methods enables you to:

• use methods having names longer than 31 characters
• specify method and class names at run-time, for example, as input from an application user

For further information, see Using the javaMethod Function on Non-Static Methods.

Invoking Methods on Java Objects

Obtaining Information About Methods