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Core Java - Interview Questions and Answers for 'Stringbuilder' - 9 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

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Very frequently asked. Usually difference between String,StringBuffer and StringBuilder is asked in different variations.
  Q2. Difference between StringBuffer and StringBuilder ?Core Java
Anonymous
Ans. StringBuffer is synchronized whereas StringBuilder is not.

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  Q3. 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);

}

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 Q4. Give an Example for Builder Pattern ?Core Java
Admin
info@buggybread.com
Ans. String str = new StringBuilder().append("Buggy").append("Bread").toString();

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 Q5. Can StringBuffer and StringBuilder in Java be inherited?Core Java2017-03-15 13:54:44

Ans. No, they have been declared final and hence cannot be extended.

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   Like      Discuss      Correct / Improve     StringBuffer  StringBuilder

 Q6. Do we have a method to reverse a string in String class ?Core Java2017-07-29 09:52:30

Ans. No but we have it in StringBuilder.

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   Like      Discuss      Correct / Improve     String  StringBuilder  Reverse a string

 Q7. Which of the following class creates immutable objects ?Core Java
a. String
b. StringBuffer
c. StringBuilder
d. None of these create immutable objects.

Ans.a. String
 Q8. Which of the following class is synchronized ?Core Java
a. String
b. StringBuffer
c. StringBuilder
d. None of these

Ans.b. StringBuffer
 Q9. Which of the following class cannot be extended or inherited ?

StringBuffer , StringBuilder		Core Java
a. StringBuffer
b. StringBuilder
c. Both cannot be extended
d. Both can be extended

Ans.c. Both cannot be extended

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