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Interview Questions and Answers for 'Hewlett packard (hp)' - 10 question(s) found - Order By Newest

 Q1. What is the difference between declaration, instantiation and initialization ?Core Java2016-05-26 14:17:48

Ans. Declaration is intimation to the compiler about the nature of Data a reference is going to hold.

For example - List myList;

Instantiation is reservation of memory.

For example

myList = new ArrayList();

Initialization or construction is setting the default values for member elements.

For example

myList = new ArrayList(mySet);

** Example 2nd is both for instantiation as well as initialization. The only difference is that 2nd will initialized the member elements to their default values whereas 3rd will initialized it with the elements from set.


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   Like         Discuss         Correct / Improve     declaration   instantiation   initialization   construction     Asked in 1 Companies      basic        frequent


  Q2. What is Serialization ? Why do we need it ?Core Java
Anonymous
Ans. Storing the state of an object in a file or other medium is called serialization.

Classes can communicate only if they are built together ( as they need Byte code for communication ). What if we need to enable communication between different applications ( i.e they have been built independently or even they reside at different locations ), We need a mechanism that will transfer the Bean state to a Medium than can be transferred to the receiving application.

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   Like         Discuss         Correct / Improve     java   oops   serialization     Asked in 18 Companies      basic        frequent

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 Q3. Can we call the garbage collector explicitly ?Core Java
Admin
info@buggybread.com
Ans. Yes, We can call garbage collector directly but it doesn't guarantees that the gc will start executing immediately. This gc( ) method appears in both Runtime and System classes of java.lang package.

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   Like         Discuss         Correct / Improve     java   garbage collection   java memory management   jvm   gc   yes no     Asked in 4 Companies      expert

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 Q4. what is covariant return type? Core Java
Admin
info@buggybread.com
Ans. co-variant return type states that return type of overriding method can be subtype of the return type declared in method of superclass. it has been introduced since jdk 1.5

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   Like         Discuss         Correct / Improve     java   oops   inheritence   overriding   covariant return type   jdk5   advanced     Asked in 3 Companies      expert


  Q5. Why java doesn't support multiple Inheritance ?

or

Explain Java Diamond Problem.
Core Java2017-01-09 11:45:34

Ans. class A {
void test() {
System.out.println("test() method");
}
}

class B {
void test() {
System.out.println("test() method");
}
}

Suppose if Java allows multiple inheritance like this,

class C extends A, B {
}

A and B test() methods are inheriting to C class.

So which test() method C class will take? As A & B class test() methods are different , So here we would Facing Ambiguity.

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   Like         Discuss         Correct / Improve     multiple inheritance  object oriented programming (oops)  oops concepts  diamond problem     Asked in 20 Companies      basic        frequent


  Q6. Write a Program to check if 2 strings are Anagrams ?Core Java2016-11-30 20:52:37

Ans. public void checkIfAnagram(String str1,String str2){
boolean anagram = true;
for(char c:str1.toCharArray()){
if(!str2.contains(String.valueOf(c))){
System.out.println("Strings are Anagrams");
anagram = false;
}

if(anagram == true){
System.out.println("Strings are not Anagrams");
}
}
}

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   Like         Discuss         Correct / Improve      check if 2 strings are Anagrams     Asked in 29 Companies      basic        frequent


 Q7. Difference between Inner and Outer Join ?Database
Admin
info@buggybread.com
Ans. Inner join is the intersection of two tables on a particular columns whereas Outer Join is the Union of two tables.

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   Like         Discuss         Correct / Improve     sql   joins   inner join   outer join     Asked in 3 Companies      basic        frequent


 Q8. Have you ever had any conflict with the team member (like disagreement on some design decision ) and How you reacted to it ? General2016-11-30 15:55:39

Ans. [Open Ended Answer]

This is a very sensitive question and should be dealt with caution. Just simply saying that you never had any disagreement will present you as dumb team member. Showing your self as too aggressive in such decisions will present you as a trouble maker. You should present a situation where you had an argument / disagreement but eventually you and your team mates mutually found a way out of it.

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   Like         Discuss         Correct / Improve          Asked in 20 Companies      basic


 Q9. What is the use of Synchronized block ?Core Java

Ans. The goal of a synchronised block is to achieve mutual exclusion i.e at one time, the segment of the code should be executed by single thread only and hence the lock needs to be retrieved before executing the segment and then released.

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   Like         Discuss         Correct / Improve     synchronized block   synchronized   synchronization   multithreading   threads   mutual exclusion   concurrency     Asked in 4 Companies      intermediate        frequent

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 Q10. What is a factory design pattern ?Design2017-01-09 13:21:43

Ans. Factory Design Patterns is the pattern that recommends creation of separate Factory Object for creation of other object.

So its like saying - If you want to create an object of ClassA, Talk to FactoryObject ( which is an object of FactoryClass ). FactoryObject in itself encapsulates the inputs and logic required to make the decision regarding the creation and construction of object.

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   Like         Discuss         Correct / Improve     design pattern  factory design pattern     Asked in 9 Companies




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