PartialQuestion 5Consider:interface I{}interface J{}}class A implements I{void doI();}void doJ();class B extends A{}public void doI(){}}class C implements J{public void doJ(){}public void doJ(){}class D implements I, J{public void doI()}public void doJ()}I i1= new B();I i2= new DO);J j1 = new C();J j2= new D();Which of the following are valid?il.doI();j2.doI();i2.doJ();j1.doI();j2.doJ();j1.doJ();il.doJ()i2.doI();

Answer: We have explain which option is valid.

Consider: interface I { } interface J { } } void doI(); class A implements I { } void doJ(); class B extends A { } public void doI() { } public void doJ() { } class C implements J { public void doJ() { } class D implements I, J { public void doI() { } public void doJ() { } } I i1= new B(); I i2= new D(); J j1 = new C(); Jj2 = new D(); Which of the following are valid?

Consider: interface I { } interface J { } } void doI(); class A implements I { } void doJ(); class B extends A { } public void doI() { } public void doJ() { } class C implements J { public void doJ() { } class D implements I, J { public void doI() { } public void doJ() { } } I i1= new B(); I i2= new D(); J j1 = new C(); Jj2 = new D(); Which of the following are valid?

Microsoft Visual C#

7th Edition

ISBN:9781337102100

Author:Joyce, Farrell.

Publisher:Joyce, Farrell.

Chapter10: Introduction To Inheritance

Section: Chapter Questions

Problem 20RQ

See similar textbooks

Similar questions

PROGRAMMING LANGUAGE: JAVA SUBJECT: ADVANCED OOP WITH JAVA QUESTION NO 1: Make an abstract class named A1 with 2 abstract methods, then implement those methods in child class.
JAVA CLASS AND OBJECT JAVA JAVA JAVA Write a java program/code of the given problems below: abstract class Animal { // abstract methods abstract void move(); abstract void eat(); // concrete method void label() { System.out.println("Animal's data:"); } } 1.) Modify the abstraction example code above by adding another class “TestCarabao” with the necessary methods “label, move, and eat”. 2.) Write a program that creates a car object, and displays the year and name with one method “speed”. Example output: Year: 2021 Model: Toyota Speed: 200km/h 3.) Write the main class of the given class Animal below that set the number of legs to “4” and display (get) the number of legs. class Animal { private int numberOfLegs; public void setNumberOfLegs(int numberOfLegs) { this.numberOfLegs = numberOfLegs; } public int getNumberOfLegs() { return numberOfLegs; } }
public class BankAccount implements Deposit, Withdraw {...} public interface Deposit {public void deposit (double amount); } public interface Withdraw {public void withdraw (double amount); } and the following code: Person pl Person p2 Person p3 new Person ("Louis"); new Person ("Louis"); = new Person ("Sue"); BankAccount bl new BankAccount (p1); BankAccount b2 = new BankAccount (p2); ArrayList accounts = new ArrayList () ; accounts.add (bl); accounts.add (b2) ; accounts.add (new BankAccount (p3)); //LINE *** Which ONE of the following statements would be illegal if placed after the //LINE*** Comment. accounts.get(2).deposit(100); b2.withdraw(100); accounts.get(0).deposit(100); accounts.get(2).withdraw(100); b1.deposit(100);
Interfaces are used to define stronger is-a relationships because one class can inherit multiple interfaces. Ture or false
T/F1. However, implementation classes may be extended, but interface classes cannot.
Describe one advantage of requiring a class to implement an interface.
Pick the incorrect statement: O A class can implement more than one interface O A class can extend more than one classes O An interface can extend more than one interfaces O An interface cannot extend a class
Code: import java.util.*; //Bicycle interface interface Bicycle { abstract void changeCadence(int newValue); //will change value of candence to new value abstract void changeGear (int newValue); //changes gear of car abstract void speedUp(int increment); //increments speed of car by adding new Value to existing speed abstract void applyBrakes(int decrement); } //ACMEBicycle class definition class ACMEBicycle implements Bicycle { int cadence = 0; Â Â int speed = 0; Â Â int gear = 1; //methods of interface public void changeCadence(int newValue) { this.cadence=newValue; } public void changeGear (int newValue) { this.gear=newValue; } public void speedUp(int increment) { this.speed+=increment; } public void applyBrakes(int decrement) { this.speed-=decrement; } //display method void display() { System.out.println("Cadence: "+this.cadence); System.out.println("Gear: "+this.gear); System.out.println("Speed: "+this.speed); } } //KEYOBicycle class definition class KEYOBicycle implements…
class A {protected int x1,y1,z; public: A(a, b,c):x1(a+2),y1(b-1),z(c+2) { for(i=0; i<5;i++) x1++;y1++;z++;}}; class B {protected: int x,y; public: B(a,b):x(a+1),y(b+2) { for(i=0; i<5;i++) x+=2; y+=1;}}; class D:public B, virtual public A { private: int a,b; public: D(k,m,n): a(k+n), B(k,m),b(n+2),A(k,m,n) { a=a+1;b=b+1;}}; int main() (Dob(4,2,5);} what the values of x1,y1 and z
Given: interface B void methodA(); class C implements B { void methodB(){ } } everything is fine methodA should be overriden in class C O class C should be abstract O either b or c
Code: interface Bicycle{ //interface for bicycle void changeGear(int val); //abstract methods void changeSpeed(int inc); void applyBrakes(int dec); void ringBell(int count); } class NewCycle implements Bicycle{ //class for a new cycle int speed=0; //stores the speed value int gear=0; //stores the gear value @Override public void changeGear(int val) { //method to change the gear gear=val; } @Override public void changeSpeed(int inc) { //method to change the speed speed=speed+inc; } @Override public void applyBrakes(int dec) { //method to apply brakes speed=speed-dec; } @Override public void ringBell(int count) { //method to ring the bell for(int i=0;i<count;i++){ System.out.print("Clang!!"+" "); } System.out.println(""); } public void printState(){ //method to print the states System.out.println("Ring bell, Speed, Gear,…
An enumeration can contain public constant variables O True O False An interface can extend as many interfaces as the programmer wants O True O False An abstract class must contain at least 1 abstract method O True False