So before casting it to DerivedClass we may like to make sure that it is an instance of DerivedClass and hence won't throw ClassCastException. Though we can cast it to DerivedClass as followingīut it may throw ClassCastException in case x doesn't hold an instance of DerivedClass at that point. We cannot call derivedClassMethod() directly using x as x is reference of BaseClass and not DerivedClass and hence can only access methods that are defined in BaseClass and overridden in derived class. There is an operation that is defined in Derived Class, let's say derivedClassMethod() X is the reference of BaseClass but holds DerivedClass object ( Polymorphism ) InstanceOf operator is used to verify in case of downcasting. The above statement will be true if x holds an object that is an instance of ABC or any of the child class of ABC or if x holds an object that implements ABC. Where x is an object reference and ABC could be a class name or interface name. The operator instanceOf is used to verify if the specified object is the instance of specified class or interface. What is instanceOf operator ? Explain it's use ?Īns. Usually asked in relation to casting and ClassCastException. Like Discuss Correct / Improve java oops object creation new operator class.forname cloning ebay Asked in 9 Companies expert
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Sample Code for object initialization using getInstance Sample Code for object initialization using clone Using newInstance( ) method - (Class.forName(xyzClass))emp.newInstance( )īy cloning an already available object - (xyzClass)obj1.clone( ) Using factory methods - xyzFactory.getInstance( ) What are different ways of object creation in Java ? What will be the output of following code ?įrequently asked in Infosys and HCL Technologies ( Based on 2 feedback )
= means that the object contents are equal When String literals are compared using =, they always returns true if the string values are same because. X.equals(y) means that they hold same information
X.equals(y) means they are pointing to the same object X=y means that they hold same information X=y means they are pointing to the same object Which of the following statement is not true ? Like Discuss Correct / Improve java string comparison string object class = equals object equality operator = vs equals equals vs = Asked in 293 Companies basic frequent Please let us know the company, where you were asked this question : x=y means that the references x and y have same object. X.equals(y) means the references x and y are holding objects that are equal. "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. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback ) and Epam Systems Among first few questions in almost all interviews. However, if you are shortlisted, you will receive the test mail.Core Java - Interview Questions and Answers for 'Operators' - 28 question(s) found - Order By Newest Sometimes you may receive, and sometimes you may not. It depends on the job and the hiring partner. Will Qualcomm send any mails after applying? Yes, we, at oflatest, provide the alerts continuously. The selection process generally consists of two stages: Test, Technical & Interview Rounds.ĭoes oflatest provide Qualcomm off campus alerts? It is based on the reports of Glassdoor and Ambition Box. We have mentioned the Salary as expected.
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