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| Design - Interview Questions and Answers for 'Mphasis' - 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 | ||||
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 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? | ||||
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| Ans. It in Java is used to indicate that a field should not be serialized. | ||||
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| Discuss Correct / Improve java oops serialization transient java keywords Asked in 39 Companies intermediate frequent | ||||
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| Related Questions | ||||
| Which of the following combination of keywords is illegal in Java ? a. static and transient b. transient and final c. static and synchronized d. abstract and final | ||||
| Which keyword is used to provide explicit access of a code block to single thread ? a. Transient b. Final c. Explicit d. Synchronized | ||||
| Can we declare static variables as transient ? | ||||
| What are transient variables in java? | ||||
| Which of the following is true ? | ||||
| Variables of an interface are intrinsically ... a. transient b. final c. public d. static | ||||
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| Ans. Both are creational design patterns. Singleton is used when we would like to reuse an object if object is not supposed to hold request or thread specific information. Inversely Prototype is used in situations where we would like to reuse the object information but the request / thread may require it own data to be persisted. In short, Singleton is used in situations where we can live with single object being shared across multiple requests or threads whereas Prototype is used when we need duplicate copies of objects. | ||||
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| Discuss Correct / Improve design pattern singleton prototype creational design pattrn Asked in 7 Companies expert | ||||
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| Related Questions | ||||
| What is the difference between Singleton and Prototype Bean scope in Spring ? | ||||
| When should we use prototype scope and singleton scope for beans ? | ||||
| Does it make sense to clone an object which is supposed to be immutable ? | ||||
| What is a prototype design pattern ? | ||||
| Can we use Prototype Bean scope with Autowiring ? | ||||
