Related InterviewSolutions

• final class Complex {private final double re;private final double im;public Complex(double re, double im) {this.re = re;this.im = im;}public String toString() {return "(" + re + " + " + im + "i)";}}class Main {public static void main(String args[]){Complex c = new Complex(10, 15);System.out.println("Complex number is " + c);}}(A)Complex number is (10.0 + 15.0i)(B) Compiler Error(C)Complex number is SOME_GARBAGE(D)Complex number is Complex8e2fb5Here 8e2fb5 is hash code of c
• Predict the output of following program. Note that foo() is public in base and private in derived.class Base {public void foo() { System.out.println("Base"); }}class Derived extends Base {private void foo() { System.out.println("Derived"); }}public class Main {public static void main(String args[]) {Base b = new Derived();b.foo();}}(A) Base(B) Derived(C) Compiler Error(D) Runtime Error
• Which of the following is true about inheritance in Java.1) In Java all classes inherit from the Object class directly or indirectly. The Object class is root of all classes.2) Multiple inheritance is not allowed in Java.3) Unlike C++, there is nothing like type of inheritance in Java where we can specify whether the inheritance is protected, public or private.(A) 1, 2 and 3(B) 1 and 2(C) 2 and 3(D) 1 and 3
• class Base {final public void show() {System.out.println("Base::show() called");}}class Derived extends Base {public void show() {System.out.println("Derived::show() called");}}class Main {public static void main(String[] args) {Base b = new Derived();;b.show();}}(A) Base::show() called(B) Derived::show() called(C) Compiler Error(D) Runtime Error
• Output of following Java program?class Base {public void Print() {System.out.println("Base");}}class Derived extends Base {public void Print() {System.out.println("Derived");}}class Main{public static void DoPrint( Base o ) {o.Print();}public static void main(String[] args) {Base x = new Base();Base y = new Derived();Derived z = new Derived();DoPrint(x);DoPrint(y);DoPrint(z);}}(A)BaseDerivedDerived(B)BaseBaseDerived(C)BaseDerivedBase(D) Compiler Error
• class Base {public static void show() {System.out.println("Base::show() called");}}class Derived extends Base {public static void show() {System.out.println("Derived::show() called");}}class Main {public static void main(String[] args) {Base b = new Derived();b.show();}}(A) Base::show() called(B) Derived::show() called(C) Compiler Error
• Which of the following is true about inheritance in Java?1) Private methods are final.2) Protected members are accessible within a package and inherited classes outside the package.3) Protected methods are final.4) We cannot override private methods. (A) 1, 2 and 4(B) Only 1 and 2(C) 1, 2 and 3(D) 2, 3 and 4
• What would be the result if a class extends two interfaces and both have a method with same name and signature? Lets assume that the class is not implementing that method.(a) Runtime error(b) Compile time error(c) Code runs successfully(d) First called method is executed successfullyThis question was posed to me in an online interview.Question is taken from Inheritance in chapter Inheritance of Java
• Does Java support multiple level inheritance?(a) True(b) FalseI had been asked this question during an online exam.This is a very interesting question from Inheritance topic in chapter Inheritance of Java
• Which of the following is used for implementing inheritance through class?(a) inherited(b) using(c) extends(d) implementsI have been asked this question during an internship interview.I would like to ask this question from Inheritance topic in portion Inheritance of Java