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Interview Questions

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How to call super class constructor from subclass constructor?

Submitted by Bharat on Sat, 09/04/2010 - 00:15

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Constructor of the super class can be called using super.

How to call a constructor from another constructor within the class?

Submitted by Bharat on Sat, 09/04/2010 - 00:14

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Different constructor of the same class can be called using “this”. e.g.

public class Q1 {
 Q1(){
  System.out.println("Default Constructor");
 }
 
 Q1(String msg){
  this(); //calls default constructor
  System.out.println("One Argument Constructor");
 }
}

What happens if you create one argument constructor and do not create constructor without argument?

Submitted by Bharat on Sat, 09/04/2010 - 00:13

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If class does not define any constructors, Java automatically creates default constructor with no arguments. However, if constructor with arguments is specified, Java does not create default one.

Nothing happens if we do not specify the default constructor. However,

What is difference between method and constructor?

Submitted by Bharat on Sat, 09/04/2010 - 00:12

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Constructor is a special member function of a class which is used to create object of that class. Constructor has a same name as that of the class. It also does not have any return type. However, constructor may have arguments.