Answer Posted / chitij mehrotra

1 A class may inplement several interfaces. A class may
extend only one abstract class.
2 An interface can have only abstract methods. An abstract
class can have both abstract methods and concrete methods.
At one abstract method in the abstract class.
3 Interfaces cannot have constructors. Abstract class can
have constructors.
4 Only static final variables are allowed to be decelared.
Both static and instance variables are allowed.
5 All decelared methods are implicitly public. Can have any
kind of methods.
6 We should initialize variables in an interface. Not
necessary to initialize variables in an abstract class.
7 In the case of interface you can make any class in the
hierarchy. In the case of abstract class you know the class
hierarchy in advance.
8 An interface implementation may be added to any existing
third party class. A third party class must be rewritten to
extend only from the abstract class.
9 Interfaces can be implemented by classes that are not
related to one another Abstract classes are used only when
there is a “is-a” type of relationship between the classes.

Does java allow overriding static methods ?

1161

---

Can we catch more than one exception in single catch block?

1121

---

Which programming language is most secure?

1037

---

Can a class extends itself in java?

1072

---

Can you change array size in java?

1012

---

What does java edition mean?

1265

---

Can we catch more than one exception in a single catch block?

1135

---

What are register variables what are the advantages?

940

---

What is set in java?

1107

---

Can we have try without catch block?

1143

---

Does java support Operator Overloading?

1088

---

What is java life cycle?

1046

---

How garbage collection is done in java?

1103

---

Why does java not allow multiple public classes in a java file ?

4663

---

What is the difference between keyword and identifier?

1085

---