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Interview Questions and Answers for 'SynergisticIT' - 3 question(s) found - Order By Rating | ||||
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Ans. class A { void test() { System.out.println("test() method"); } } class B { void test() { System.out.println("test() method"); } } Suppose if Java allows multiple inheritance like this, class C extends A, B { } A and B test() methods are inheriting to C class. So which test() method C class will take? As A & B class test() methods are different , So here we would Facing Ambiguity. | ||||
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Like Discuss Correct / Improve  multiple inheritance  object oriented programming (oops)  oops concepts  diamond problem Asked in 20 Companies basic   frequent | ||||
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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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 asked along with String Class related questions. | ||||
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Ans. Class using which only immutable (objects that cannot be changed after initialization) objects can be created. | ||||
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Like Discuss Correct / Improve  java   oops   immutable  immutability   immutable  immutability class   string class   basic interview question Asked in 18 Companies Basic   frequent | ||||
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Related Questions | ||||
Why is String immutable in Java ? | ||||
Why Char array is preferred over String for storing password? | ||||
How does making string as immutable helps with securing information ? How does String Pool pose a security threat ? | ||||
How is string object immutable if we can concat a string to it ? | ||||
How to implement an immutable class ? | ||||
What is an Immutable Object ? | ||||
Does Declaring an object "final" makes it immutable ? | ||||
Is String final in Java ? | ||||
What are stateless objects ? How are they different from immutable objects ? Which of these two is thread safe ? | ||||