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Interview Questions and Answers for 'Concerto software' - 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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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 ? | ||||
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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. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance | ||||
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Like Discuss Correct / Improve  core oops concepts Asked in 65 Companies basic   frequent | ||||
Related Questions | ||||
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 the difference between Encapsulation and Abstraction? | ||||
What are points to consider in terms of access modifier when we are overriding any method? | ||||
What is Polymorphism in Java ? | ||||
Difference between Overloading and Overriding ? | ||||
Can you give a real world example of Encapsulation and Abstraction ? | ||||
Why every object constructor automatically call super() in Object before its own constructors? | ||||
How compiler handles the exceptions in overriding ? | ||||
Difference between Composition and Inheritance ? | ||||
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Ans. package snippet; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; import java.util.List; import java.util.Map; public class Pascal { public static void main(String[] args) { System.out.println(generatePascalTriangle(5)); } static Map> generatePascalTriangle(int size) { Map> triangle = new HashMap<>(); triangle.put(0, Arrays.asList(1)); triangle.put(1, Arrays.asList(1, 1)); for (int i = 2; i <= size; i ) { List coeffListForI = new ArrayList<>(); List coeffListForI_1 = triangle.get(i - 1); coeffListForI.add(1); for (int j = 0; j <= coeffListForI_1.size() - 2; j ) { coeffListForI.add(coeffListForI_1.get(j) coeffListForI_1.get(j 1)); } coeffListForI.add(1); triangle.put(i, coeffListForI); } return triangle; } } | ||||
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Like Discuss Correct / Improve   Asked in 8 Companies | ||||
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