Overriding And Overloading — Part 2 MCQs with Explanations

20 10 is the correct answer to “What will be the output of the following Java code? class test { int a; int b; test(int i, int j) { a = i; b = j; } void meth(test o) { o.a *= 2; O.b /= 2; } } class Output { public static void main(String args[]) { test obj = new test(10 , 20); obj.meth(obj); System.out.println(obj.a + " " + obj.b); } }”. This question is standard in competitive examination syllabi for Overriding And Overloading.

Copy of argument is made into the formal parameter of the subroutine is the correct answer to “Which of these is correct about passing an argument by call-by-value process”. This question is standard in competitive examination syllabi for Overriding And Overloading.

7 is the correct answer to “What will be the output of the following Java code? class overload { int x; int y; void add(int a) { x = a + 1; } void add(int a, int b) { x = a + 2; } } class Overload_methods { public static void main(String args[]) { overload obj = new overload(); int a = 0; obj.add(6); System.out.println(obj.x); } }”. This question is standard in competitive examination syllabi for Overriding And Overloading.

4 6.4 is the correct answer to “What will be the output of the following Java code? class overload { int x; double y; void add(int a , int b) { x = a + b; } void add(double c , double d) { y = c + d; } overload() { this.x = 0; this.y = 0; } } class Overload_methods { public static void main(String args[]) { overload obj = new overload(); int a = 2; double b = 3.2; obj.add(a, a); obj.add(b, b); System.out.println(obj.x + " " + obj.y); } }”. This question is standard in competitive examination syllabi for Overriding And Overloading.

Polymorphism is the correct answer to “Which of these is supported by method overriding in Java”. This question is standard in competitive examination syllabi for Overriding And Overloading.

super is the correct answer to “Which of this keyword can be used in a subclass to call the constructor of superclass”. This question is standard in competitive examination syllabi for Overriding And Overloading.

The variable first is set to elements[0] is the correct answer to “What will be the output of the following Java program? class Abc { public static void main(String[]args) { String[] elements = { "for", "tea", "too" }; String first = (elements.length > 0) ? elements[0]: null; } }”. This question is standard in competitive examination syllabi for Overriding And Overloading.

final, static, public is the correct answer to “At line number 2 in the following code, choose 3 valid data-type attributes/qualifiers among "final, static, native, public, private, abstract, protected" public interface Status { /* insert qualifier here */ int MY_VALUE = 10; }”. This question is standard in competitive examination syllabi for Overriding And Overloading.

10 20 is the correct answer to “What will be the output of the following Java code? class test { int a; int b; void meth(int i , int j) { i *= 2; j /= 2; } } class Output { public static void main(String args[]) { test obj = new test(); int a = 10; int b = 20; obj.meth(a , b); System.out.println(a + " " + b); } }”. This question is standard in competitive examination syllabi for Overriding And Overloading.

2 is the correct answer to “What will be the output of the following Java program? class A { int i; public void display() { System.out.println(i); } } class B extends A { int j; public void display() { System.out.println(j); } } class Dynamic_dispatch { public static void main(String args[]) { B obj2 = new B(); obj2.i = 1; obj2.j = 2; A r; r = obj2; r.display(); } }”. This question is standard in competitive examination syllabi for Overriding And Overloading.