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Core java - Interview Questions and Answers for 'American express' - 12 question(s) found - Order By Newest

 Q1. How can we run a java program without making any object?Core Java
Anonymous
Ans. By putting code within static method. With Java 6 and earlier versions, even static block can be used.

  Sample Code for static block

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Frequently asked in Tech Mahindra ( Based on 3 inputs )
  Q2. What is the difference between List, Set and Map ?Core Java
Anonymous
Ans. List - Members are stored in sequence in memory and can be accessed through index.
Set - There is no relevance of sequence and index. Sets doesn't contain duplicates whereas multiset can have duplicates.
Map - Contains Key , Value pairs.

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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.
  Q3. What is the difference between StringBuffer and String class ?Core Java
Anonymous
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.

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Very Frequently asked to fresh graduates and less experienced. Favorite question in Walk in drives. Frequently asked in Indian Services companies.
  Q4. Difference between Overloading and Overriding ?Core Java
Anonymous
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

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Frequently asked.
  Q5. What is an Iterator?Core Java
Anonymous
Ans. Iterator is an interface that provides methods to iterate over any Collection.

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 Q6. What are transient variables in java?Core Java
Anonymous
Ans. Transient variables are variable that cannot be serialized.

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 Q7. What are the primitive data types in Java ?Core Java2016-11-21 15:23:24

Ans. boolean byte char double float int long short void

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 Q8. What is a class and object ?

or

How would you explain a fresher the concept of class and object in simple terms ?
Core Java2017-01-19 12:39:36

Ans. Class is a template using which objects are created in memory. It's kind of a mold using which objects with body / state are made.


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 Q9. What are callback methods ?Core Java2017-01-23 12:57:21

Ans. Component methods called by the container to notify the component of the events

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   Like      Discuss      Correct / Improve          American Express



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 Q10. can we use null as keyword ? Core Java2018-06-06 08:28:24

 This question was recently asked at 'American Express'.This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve          American Express


 Q11. What is Dynamic Binding ?Core Java2018-06-07 09:13:05

 This question was recently asked at 'American Express'.This question is still unanswered. Can you please provide an answer.


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

   Like      Discuss      Correct / Improve          American Express


 Q12. How do we do Inheritance in Java ?Core Java2018-06-07 09:13:32

 This question was recently asked at 'American Express'.This question is still unanswered. Can you please provide an answer.


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   Like      Discuss      Correct / Improve          American Express




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