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Interview Questions and Answers for 'Travelex' - 2 question(s) found - Order By Rating | ||||
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Ans. OOPs or Object Oriented Programming is a Programming model which is organized around Objects instead of processes. Instead of a process calling series of processes, this model stresses on communication between objects. Objects that all self sustained, provide security by encapsulating it's members and providing abstracted interfaces over the functions it performs. OOP's facilitate the following features 1. Inheritance for Code Reuse 2. Abstraction for modularity, maintenance and agility 3. Encapsulation for security and protection 4. Polymorphism for flexibility and interfacing | ||||
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Like Discuss Correct / Improve  oops  oops features Asked in 260 Companies basic   frequent | ||||
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Can you give a real world example of Encapsulation and Abstraction ? | ||||
Which of the following Java feature promotes access protection or Hiding ? a. Inheritance b. Encapsulation c. Abstraction d. Composition | ||||
Define encapsulation in Java ? | ||||
Give an example of how Object Oriented Programming Concepts can be implemented. | ||||
Which of the OOP's features facilitate dependency injection ? | ||||
Which of the OOP's feature - encapsulation or abstraction - is more important ? | ||||
Which of the polymorphism type - static or runtime - is more important ? | ||||
Which of the OOP's feature is most important ? | ||||
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 | ||||
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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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Difference between == and .equals() ? | ||||
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What are different ways to create String Object? Explain. | ||||
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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 ? | ||||
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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 | ||||