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Core Java - Interview Questions and Answers for 'Stringbuilder' - 6 question(s) found - Order By Newest

Very frequently asked in different variations. Frequently asked in Deloitte ( 2 feedback ) , HCL Tech ( 3 feedback ), TCS 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
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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   Like         Discuss         Correct / Improve     java   string class   string   stringbuilder   stringbuffer   String vs StringBuffer   String vs StringBuilder   String vs StringBuilder vs StringBuffer   StringBuffer vs stringBuilder     Asked in 29 Companies      basic        frequent
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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
Ans. StringBuffer is synchronized whereas StringBuilder is not.

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   Like         Discuss         Correct / Improve     java   string   stringbuffer   string class   stringbuilder   synchronized   basic interview question   infosys technologies     Asked in 17 Companies      basic        frequent
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  Q3. Write a method to check if input String is Palindrome?Core Java
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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   Like         Discuss         Correct / Improve     java   string   stringbuilder   stringbuilder   string class   code   palindrome     Asked in 38 Companies      Basic        frequent

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

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   Like         Discuss         Correct / Improve     java   builder pattern   design pattern   stringbuilder   string     Asked in 3 Companies
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 Q5. Can StringBuffer and StringBuilder in Java be inherited?Core Java
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 Java
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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