1. Interface must be declared with the key word ‘interface’.

2. All interface methods are implicitly public and abstract. In another words you dont need to atually type the public or abstract modifiers in the metod declaration, but method is still allways public and abstract.

3. All variables defined in an interface is public, static, and final. In another words, interfaces can declare only constants , not instance variables.

4. Interface methods must not be static.

5. Because interface methods are abstract, they cannot be marked final, strictfp, or native.

6. An interfaces can extend one or more other interfaces.

7. An interface cannot implement another interface or class.

8. interface types can be used polymorphically.

This is the day i am start posting the topics on scjp. Basically i am planning to prepare for the SCJP (Sun Certified Java programmer), So that I am happy to share my preparation, I am happy to discuss each and every important point which i feel, I want to figure out the success tips to help others.

To day i am happy that  strongly decided to complete the exam in three months. Lets see what will happen.

I hope I will get your support to success.

Lets wish me once for the success.