[DrJava] [ drjava-Bugs-1233297 ] illigal class casting is allowed in the interaction pane

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Bugs item #1233297, was opened at 2005-07-06 15:39
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Category: DynamicJava
Group: Serious
Status: Open
Resolution: None
Priority: 5
Submitted By: Maruf Muqtadir (ninarekcah)
Assigned to: Nobody/Anonymous (nobody)
Summary: illigal class casting is allowed in the interaction pane

Initial Comment:
Consider the following classes. 

public class SuperClass{
	public void methodA(){
		System.out.println("methodA of superClass");
	}
}

public class ChildB extends SuperClass{
	public void methodA(){
			System.out.println("methodA of ChildB");
	}
}

public class ChildA extends SuperClass{
	public void methodA(){
		System.out.println("methodA of ChildA");
	}
}

In the interaction pane, if I create an object of say,
ChildB and points that with a SuperClass reference, and
then tries to cast the reference to a ChildA type
object, and try to print the object, the interaction
pane allows me to do so, and prints that the object is
of type ChildB and the identifier for that object.
Which is obviously an error. Though, when I try to
compile and run such illigal things with DrJava
interface, it throws an exception stating that the
actual object is of type ChildB and cannot be casted to
ChildA, which is a valid complain. 

I am using JDK1.4 and drjava-beta-20050610-1655.

The interaction pane is a very useful feature for the
students. But, if it allows such illigal things to
carry on successfully, it will just confuse the
students more.

If you need any further clarification about the
problem, please inform me.

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