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| Design - Interview Questions and Answers for 'Atos' - 3 question(s) found - Order By Newest | |||||||||||
 Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback ) and Epam Systems | |||||||||||
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| Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory. x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object. Sample code: String x = new String("str"); String y = new String("str"); System.out.println(x == y); // prints false System.out.println(x.equals(y)); // prints true | |||||||||||
 Sample Code for equals | |||||||||||
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 Discuss Correct / Improve  java string comparison string object class == equals object equality operator == vs equals equals vs ==  Asked in 294 Companies  basic  frequent | |||||||||||
 Try 6 Question(s) Test | |||||||||||
 Related Questions | |||||||||||
 What is the difference between = and == in Java ? | |||||||||||
| How is == operator different for objects and primitive types ? | |||||||||||
| What will be the output of following code Integer x = 1; Integer y = 2; System.out.println(x == y); What if you change 1 to "1" and Integer to String? | |||||||||||
| Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews. | |||||||||||
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| Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ). A class can extend single abstract class whereas it can implement multiple interfaces. | |||||||||||
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| Discuss Correct / Improve java classes abstract class interfaces abstract class vs interface abstract classes vs interfaces Asked in 82 Companies basic frequent | |||||||||||
| Related Questions | |||||||||||
| What are the different uses of Interfaces in Java ? | |||||||||||
| Why can't we have diamond problem with interfaces ? | |||||||||||
| Why do we need Thread class even in case we execute thread using runnable interface ? | |||||||||||
| What is the difference between List, Set and Map ? or What are the different Java Collections Interfaces ? | |||||||||||
| What are Marker Interfaces ? Name few Java marker interfaces ? | |||||||||||
| Can we declare interface methods as private ? | |||||||||||
| What is comparator interface used for ? | |||||||||||
| What is the use of runnable interface if we can always create a new thread using Thread class ? | |||||||||||
| Which of the following doesn't extend Collection interface ? | |||||||||||
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| This question was recently asked at 'Atos'.This question is still unanswered. Can you please provide an answer. | |||||||||||
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| Discuss Correct / Improve Asked in 1 Companies | |||||||||||
| 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 ? | |||||||||||
| 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 a Lambda Expression ? What's its use ? | |||||||||||
| What are different ways to create String Object? Explain. | |||||||||||
| Why Char array is preferred over String for storing password? | |||||||||||
| Does garbage collection guarantee that a program will not run out of memory? | |||||||||||
| What is the difference between final, finally and finalize() ? | |||||||||||
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