Core java - Interview Questions and Answers for 'Hitachi' | Search Java Interview Question - javasearch.buggybread.com
Javasearch.buggybread.com
Share

Search Interview Questions


 3335 questions in repository.
 There are more than 200 unanswered questions.
Click here and help us by providing the answer.
 Have a video suggestion.
Click Correct / Improve and please let us know.
Label / Company      Label / Company / Text

   



Hitachi


   




Core java - Interview Questions and Answers for 'Hitachi' - 2 question(s) found - Order By Newest

Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ) and Coginizant (CTS)
  Q1. Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?
Core Java
Anonymous
Ans. If the Object value will not change, use String Class because a String object is immutable.

If the Object value can change and will only be modified from a single thread, use StringBuilder because StringBuilder is unsynchronized(means faster).

If the Object value may change, and can be modified by multiple threads, use a StringBuffer because StringBuffer is thread safe(synchronized).

  Sample Code for String

  Sample Code for StringBuffer

  Sample Code for StringBuilder

 Help us improve. Please let us know the company, where you were asked this question :   


   Like         Discuss         Correct / Improve     java   string class   string   stringbuilder   stringbuffer     Asked in 27 Companies      basic        frequent

Try 3 Question(s) Test


Related Questions

  Difference between == and .equals() ?
  Why is String immutable in Java ?
  What are different ways to create String Object? Explain.
  Why Char array is preferred over String for storing password?
  What is a String Pool ?
 How does making string as immutable helps with securing information ? How does String Pool pose a security threat ?
 How is string object immutable if we can concat a string to it ?
  What is StringJoiner ?
 Which of the following is false about main method ?

a. It should be declared public and static
b. it should have only 1 argument of type String array
c. We can override main method
d. We can overload main method


  Q2. Write a method to check if input String is Palindrome?Core Java
Admin
info@buggybread.com
Ans. private static boolean isPalindrome(String str) {

if (str == null)
return false;

StringBuilder strBuilder = new StringBuilder(str);

strBuilder.reverse();

return strBuilder.toString().equals(str);

}

 Help us improve. Please let us know the company, where you were asked this question :   

   Like         Discuss         Correct / Improve     java   string   stringbuilder   stringbuilder   string class   code   palindrome     Asked in 38 Companies      Basic        frequent


Related Questions

  How does volatile affect code optimization by compiler?
  Which keyword is used to provide explicit access of a code block to single thread ?

a. Transient
b. Final
c. Explicit
d. Synchronized
 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?
  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 ?
  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;
}
 What is the difference between following two segments of code

Code 1

int x = 4 * 3;
int y = x * 5;

Code 2

int y = 4 * 3 * 5;

 If arrays cannot be resized , Why is this code valid

String[] strArray = new String[2];
strArray = new String[5];




Subscribe to Java News and Posts. Get latest updates and posts on Java from Buggybread.com
Enter your email address:
Delivered by FeedBurner



comments powered by Disqus
 

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.

Any input from you will be highly appreciated and It will unlock the application for 10 more requests.

Company Name:
Questions Asked:
         

X Close this