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| Interview Questions and Answers for 'Concerto software' - 3 question(s) found - Order By Rating | ||||
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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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| Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance | ||||
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Discuss Correct / Improve core oops concepts Asked in 65 Companies  basic  frequent | ||||
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 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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