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10 Tricky Core Java Interview Coding Questions

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instanceof java

Posts: 576
Nickname: instanceof
Registered: Jan, 2015

instanceof java is a java related one.
10 Tricky Core Java Interview Coding Questions Posted: May 8, 2015 8:09 AM
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This post originated from an RSS feed registered with Java Buzz by instanceof java.
Original Post: 10 Tricky Core Java Interview Coding Questions
Feed Title: Instance Of Java
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Feed Description: Instance of Java. A place where you can learn java in simple way each and every topic covered with many points and sample programs. 		Latest Java Buzz Posts
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1. What is the output of following program?

  1. package com.instanceofjava;
  2.  
  3. public class B{
  4.  
  5.   B b= new B();
  6.  
  7.  public void show(){
  8.         System.out.println("show method called");
  9.  }
  10.  
  11.  public static void main(String[] args)  {
  12.         B b= new B();
  13.         b.show();
  14.     }
  15.  
  16. }

Click for Output


Exaplanation:

  • Whenever we create the object of any class constructor will be called first and memory allocated for all non static variables
  • Here  B b= new B(); variable is object and assigned to new object of same class
  • B b= new B(); statement leads to recursive execution of constructor will create infinite objects so at run time an exception will be raised
  • Exception in thread "main" java.lang.StackOverflowError
  • The common cause for a stack overflow exception  is a bad recursive call. Typically this is caused when your recursive functions doesn't have the correct termination condition






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