interface « object reference « Java Class Q&A

1. Java - Instantiating objects of type X when all you have is the reference type    stackoverflow.com

I had a quick look at the "Related Questions" suggested but I couldn't find one directly related to what I'm asking. Even if there was one, I'd still appreciate your opinion ...

2. calling Object class methods using an interface reference variable    coderanch.com

Hi, I have always thought and read that Using a superclass reference variable that is assigned a subclass object one can access only those members that are already defined in the superclass. But in case of Interfaces, when I assign an interface reference variable an implementing class object I can call methods defined in the Object class like toString(), get Class(), ...

3. Object references as of type Interface    coderanch.com

Hi, My friend always says that it's a good Java practice to have Object references in Java to be of an interface type(Left hand side should always be an interface) . I do not understand why tho. Can someone please explain? Thanks. [ May 24, 2008: Message edited by: Arjun Reddy ]

4. Reference an object by interface and class type    forums.oracle.com

5. How does Interface Reference have the Object Class methods ?    forums.oracle.com

Using a superclass reference variable that is assigned a subclass object one can access only those members that are already defined in the superclass.Also since in classes its always the overridden version of toString() that will be called using the superclass reference variable. But in case of Interfaces, when I assign an interface reference variable an implementing class object I can ...

6. Using of object in the interface reference...    forums.oracle.com