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Design - Interview Questions and Answers for 'Edline' - 2 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 | ||||
Help us improve. Please let us know the company, where you were asked this question : | ||||
Like 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? | ||||
Very frequently asked. Usually followed by questions related to private constructor and synchronized access. Frequently asked in JPMorgan and TCS (Based on 2 feedback) | ||||
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Ans. http://www.buggybread.com/2014/03/java-design-pattern-singleton-interview.html | ||||
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Like Discuss Correct / Improve  java   design pattern   singleton   at&t   ebay  fidelity india  united healthcare india Asked in 46 Companies intermediate   frequent | ||||
Related Questions | ||||
Difference between Static and Singleton Class ? | ||||
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serialization and deserialization of singleton class | ||||
What is the difference between these two approaches of creating singleton Class ? //Double Checked Locking Code public static Singleton createInstance() { if(singleton == null){ synchronized(Singleton.class) { if(singleton == null) { singleton = new Singleton(); } } } return singleton; } //Single checked locking code public static Singleton createInstance() { synchronized(Singleton.class) { if(singleton == null) { singleton = new Singleton(); } } return singleton; } | ||||
What are design situations to use Singleton and Prototype Design Pattern ? | ||||
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When singleton can break and how to resolve it | ||||
If you are given choice to either load object eagerly or lazily , which one would you use in case of singleton pattern ? | ||||
When should we use prototype scope and singleton scope for beans ? | ||||