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Interview Questions and Answers for 'Expedia' - 3 question(s) found - Order By Newest

Frequently asked to fresh graduates and less experienced developers. Among the first few questions in many interviews.
  Q1. What are the difference between composition and inheritance in Java?Core Java
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Ans. Composition - has-a relationship between classes.
Inheritance - is-a relationship between classes.

Composition - Composing object holds a reference to composing classes and hence relationship is loosely bound.
Inheritance - Derived object carries the base class definition in itself and hence its tightly bound.

Composition - Used in Dependency Injection
Inheritance - Used in Runtime Polymorphism

Composition - Single class objects can be composed within multiple classes.
Inheritance - Single class can only inherit 1 Class.

Composition - Its the relationship between objects.
Inheritance - Its the relationship between classes.

  Sample Code for inheritance

  Sample Code for composition

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Related Questions

  Difference between Compositions and Inheritance ?
 Which of the following Java feature promotes access protection or Hiding ?

a. Inheritance
b. Encapsulation
c. Abstraction
d. Composition
  Which of the following is tightly bound ? Inheritance or Composition ?
  Can we compose the Parent Class object like this ?
 Which of the following Java features facilitates Dependency Injection - Inheritance or Composition ?
 How are the concept of Association related to Composition and Inheritance ?
 Is dependency injection possible if we don't have inheritance / Composition ?


Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 2 feedback ). Among first few questions in many interviews.
  Q2. Differences between abstract class and interface ?Core Java
Admin
info@buggybread.com
Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ).

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Related Questions

  What are Marker Interfaces ? Name few Java marker interfaces ?
  Which of the following doesn't extend Collection interface ?
 What are the different uses of Interfaces in Java ?
  What is an API ( Application Programming Interface ) ?
  Can we declare interface methods as private ?
  What is a nested interface ?
  What is an Externalizable interface ?
  Difference between serializable and externalizable interface ?
  What are the design considerations while making a choice between using interface and abstract class ?


 Q3. Write a program to print the index of the first non repeated character in a java stringCore Java2017-01-27 18:30:21

Ans. public class BuggyBread1{
public static void main (String args[]) {
   String str = "hheello world";
   char[] charArray = str.toCharArray();
   char selectedChar = 'a';
   for(char char1: charArray){
      if(!str.contains(Character.toString(char1).concat(Character.toString(char1)))){
         selectedChar = char1;
         break;
      }
   }
   System.out.println(str.indexOf(Character.toString(selectedChar)));
}
}

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Related Questions

  Which keyword is used to provide explicit access of a code block to single thread ?

a. Transient
b. Final
c. Explicit
d. Synchronized
  How does volatile affect code optimization by compiler?
  If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ?
 What is the difference between the following two code lines ?

1. new OuterClass().new InnerClass();

2. new OuterClass.InnerClass();
  Which String class does not override the equals() and hashCode() methods, inheriting them directly from class Object?
  How can we make sure that a code segment gets executed even in case of uncatched exceptions ?
  Will this code give error if i try to add two heterogeneous elements in the arraylist. ? and Why ?
 What is the difference between these two approaches of creating singleton Class ?

//Double Checked Locking Code
public static Singleton createInstance() {
   if(singleton == null){
      synchronized(Singleton.class) {
         if(singleton == null) {
            singleton = new Singleton();
         }
      }
   }
   return singleton;
}

//Single checked locking code
public static Singleton createInstance() {
   synchronized(Singleton.class) {
      if(singleton == null) {
         singleton = new Singleton();
      }
   }
   return singleton;
}
  When you will synchronize a piece of your code?
  Will finally be called always if all code has been kept in try block ?




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