[Jython-users] Strange behavior of Integer and Double

[Byrd, W. <Wil...@co...>]

I have run into some surprising behavior of Java Integer objects while using
jython:

public class Test {

	public void foo(Integer I) {
		System.out.println("Called with an Integer.");
	}

  	public void foo(int i) {
 		System.out.println("Called with an int.");
  	}

	public static void main(String[] args) {

		... initialize PythonInterpreter ...

		myInterpreter.exec("test = Test()");
		myInterpreter.exec("test.foo(Integer(1))");
		myInterpreter.exec("test.foo(2)");
	}
 }


Expected output:
	Called with an Integer.
	Called with an int.

Actual output:
	Called with an int.
	Called with an int.


I have noticed similar behavior with Double objects.

What am I doing wrong?  How can I keep Integer and Double objects from being
converted to Java primitives?


Also, why does the following call to equals() on an Integer object...

	myInterpreter.set("myInteger", new Integer(1));
	myInterpreter.exec("myInteger.equals(Integer(1))");

...result in an exception?

	Exception in thread "main" Traceback (innermost last):
	  File "<string>", line 1, in ?
	AttributeError: 'int' object has no attribute 'equals'

Note that the following version works just fine:

	myInterpreter.exec("myInteger = Integer(1)");
	myInterpreter.exec("myInteger.equals(Integer(1))");


Thanks.

	Regards,

	Will