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| Core java - Interview Questions and Answers for 'Redmane technology' - 3 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) | ||||
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| 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 : | ||||
 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 | ||||
 Try 3 Question(s) Test | ||||
 Related Questions | ||||
 Difference between == and .equals() ? | ||||
| Why is String immutable in Java ? | ||||
| Why Char array is preferred over String for storing password? | ||||
| What are different ways to create String Object? Explain. | ||||
| 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 | ||||
| Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies. | ||||
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| Ans. Overloading - Similar Signature but different definition , like function overloading. Overriding - Overriding the Definition of base class in the derived class. | ||||
| Sample Code for overloading Sample Code for overriding | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve java oops overloading overriding oops concepts basic interview question overloading vs overriding Asked in 86 Companies basic frequent | ||||
| Try 1 Question(s) Test | ||||
| Related Questions | ||||
| What are the difference between composition and inheritance in Java? | ||||
| Explain OOPs or Explain OOPs Principles or Explain OOPs Concepts or Explain OOPs features or Tell me something about OOPs | ||||
| What is the difference between Encapsulation and Abstraction? | ||||
| What are points to consider in terms of access modifier when we are overriding any method? | ||||
| What is Polymorphism in Java ? | ||||
| Can you give a real world example of Encapsulation and Abstraction ? | ||||
| Why every object constructor automatically call super() in Object before its own constructors? | ||||
| How compiler handles the exceptions in overriding ? | ||||
| Difference between Composition and Inheritance ? | ||||
| Very frequently asked. Usually asked in different variants like Diff between StringBuffer , String Builder ; Difference between StringBuilder and String class; Choice between these classes etc. | ||||
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| Ans. A string buffer implements a mutable sequence of characters. A string buffer is like a String, but can be modified. At any point in time it contains some particular sequence of characters, but the length and content of the sequence can be changed through certain method calls. The String class represents character strings. All string literals in Java programs, such as "abc" are constant and implemented as instances of this class; their values cannot be changed after they are created. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve java string stringbuffer frequently asked Asked in 18 Companies basic frequent | ||||
| Try 1 Question(s) Test | ||||
| Related Questions | ||||
| Difference between == and .equals() ? | ||||
| Why is String immutable in Java ? | ||||
| Explain the scenerios to choose between String , StringBuilder and StringBuffer ? or What is the difference between String , StringBuilder and StringBuffer ? | ||||
| Why Char array is preferred over String for storing password? | ||||
| What are different ways to create String Object? Explain. | ||||
| 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 | ||||
