Question: 1) Shortly explain interface. 2) Shortly explain abstract class and What are two important differences between an abstract class and an actual class? What are

1) Shortly explain interface.

2) Shortly explain abstract class and What are two important differences between an abstract class and an actual class? What are the similarities?

3) Shortly explain the popularity reason for the OOP.

4) Shortly explain the has-a and is-a relationship.

5) Shortly explain the No-parameter constructor behavior in java

6) Shortly explain the differences between this and super in java.

7) Shortly explain the unchecked and checked exceptions.

8) Shortly explain the visibility kinds in Java.

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