Question { Oracle, 32524 }

Difference between this(), super()?

Answer

this() call one of user define constructor inside another user constructor of the same class such as this(a), this(a,b) & so on.
super() call one of base class constructor inside the derive class constructor such as super(a), super(a,b) & so on.

Question { 13743 }

Can you call a constructor within a constructor?

Answer

We can call one of base class constructor inside derive class constructor by using predefine variable "super()" such as super(a), super(a,b) and so on.

Question { 14314 }

What is an abstract class and abstract method?

Answer

Abstract Method:- The method which is define in the class without bodies that is without implementation is call as Abstract Method. & all the Abstract Method must be define with abstract keywords.

Abstract Class:- The class which is define with some abstract method is called as Abstract Class. & all the Abstract Method must be define with abstract keywords. We cannot created the object of abstract class.

Question { BMC, 9152 }

What is Interface?

Answer

Interface is a mechanisms used to interact with or communicate with some external devices such as data base through the java application. & every interface is define with collection of abstract function.

Question { Wipro, 68068 }

Why Java is a platform independent language?

Answer

The compiler converts source code file into bytecode files. These codes are machine independent and can be run on any machine. Java interpreter reads the bytecode files and translates them into machine code for the specific machine on which the Java program in running.