JAVA MCQ TEST-I SLOT L31+L32

Creating an object from a class is also called ____.

• Initializing

• Instantiating

• Interfacing

• NONE

Which is the correct way of converting an int value to Integer in below Java code?

• Integer in = new Integer(9);

• Integer in = Integer.valueOf(9);

• Integer in = new Integer("9");

• NONE

Choose the correct syntax of a Java Package below.

• package PACKAGE_NAME;

• package PACKAGE_NAME.*;

• pkg PACKAGE_NAME;

• pkg PACKAGE_NAME.*;

What is a package in Java?

• A Package is a collection of files of type Java Class, Interfaces, or Abstract Class

• A Package is simply a Directory or Folder with Java Classes

• A Package usually contains Java Classes written for a specific purpose or problem

• All the above

What is the output of the below Java program with an Interface?

interface Car {

int basePrice=1000; }

public class InterfaceTest2 implements Car {

void changePrice() {

basePrice = 2000;

System.out.print(basePrice); }

public static void main(String[] args) {

new InterfaceTest2().changePrice(); } }

• 1000

• 2000

• COMPILE TIME ERROR

• NONE

An interface in Java is like a 100% ____.

• abstract class

• public class

• inner class

• anonymous class

What is the output of the below Java program

class Sweet {

void price() {

System.out.print("Sweet=$10 "); } }

class Sugar extends Sweet {

void price() {

super.price(); System.out.print("Sugar=$20"); } }

public class JavaInheritance1 {

public static void main(String[] args) {

Sugar su = new Sugar();

su.price(); } }

• Sweet=$10 Sugar=$20

• Sweet=$10 Sugar=$10

• Sweet=$20 Sugar=$20

• Compiler error

In a Multi Level Inheritance Class-C inherits from Class-B and Class-B inherits from Class-A. State TRUE or FALSE.

• TRUE

• FALSE

• BOTH ARE TRUE

• NONE

What is the output of the below Java program

public class MethodOverloading1 {

void show(int a, char b) {

System.out.println("KING KONG"); }

void show(char a, int b) {

System.out.println("JIM JAM"); }

public static void main(String[] args) {

MethodOverloading1 m = new MethodOverloading1();

m.show(10, 'A');

m.show('B', 10); } }

• JIM JAM

  JIM JAM

• KING KONG

  KING KONG

• KING KONG

  JIM JAM

• compiler error

The purpose of a Java constructor is ___.

• Initialization of variables with passed data

• Writing custom code

• Accepting other objects as inputs

• All the above