Does Java allow multiple inheritance for interfaces?

Answer 1

Absolutely. Here is an example:

public interface TestInterface extends FileFilter, Map {
}

In this example, a class implementing TestInterface will need to implement everything in FileFilter and Map.

Answer 2

actually java does not allow multiple inheritance for classes.
but it is implemented using the interfaces

Answer 3

Yes, saw it on book, but just try, implement Serializable tagging interface and one of the AWT event listeners and see if it compiles.

Answer 4

Yes