Answer Posted / s.arun

Main difference is methods of a Java interface are implicitly abstract and cannot have implementations. A Java abstract class can have instance methods that implements a default behavior.
Variables declared in a Java interface is by default final. An abstract class may contain non-final variables.
Members of a Java interface are public by default. A Java abstract class can have the usual flavors of class members like private, protected, etc..
Java interface should be implemented using keyword “implements”; A Java abstract class should be extended using keyword “extends”.
An interface can extend another Java interface only, an abstract class can extend another Java class and implement multiple Java interfaces.
A Java class can implement multiple interfaces but it can extend only one abstract class.
Interface is absolutely abstract and cannot be instantiated; A Java abstract class also cannot be instantiated, but can be invoked if a main() exists.
In comparison with java abstract classes, java interfaces are slow as it requires extra indirection.
For m ore detail click on http://edugoing.com/qna/index.php?qa=1&qa_1=what-the-difference-between-an-interface-and-abstract-class

Explain how cache is used? : Dot net architecture

1029

---

Differences between VS 2005, 2008 and 2010 ?

959

---

Explain different pipelining hazards? : Dot net architecture

917

---

Explain the difference between l1 and l2 cache? : .NET Architecture

968

---

Difference between type constructor and instance constructor?

1079

---

Can you Explain element .net mobile with example? : Microsoft dot net mobile

898

---

What is the use of TPL DATAFLOW?

996

---

what is tracing? Where it used?

1049

---

any one can explain about projectarchitecture and project approach briefly

2454

---

what is the difference between running an application with and without debugger?

2045

---

Explain .net mobile input controls? : Microsoft dot net mobile

885

---

What is Opf3

964

---

Waht is Dot net Arcitecture

2344

---

Whate are resource files? How are they used in .net?

859

---

Describe the advantages of writing a managed code application instead of unmanaged one. What is involved in certain piece of code being managed?

971

---