public class A { public void funl () ( System.out.println ("Al"); public class B extends A { @Override public void funl () { super.funl (); System.out.println ("B1"); public void fun2 () { System.out.println ("B2"); public class C extends B { @Override public void funl () { System.out.println ("C1");
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OOPs
In today's technology-driven world, computer programming skills are in high demand. The object-oriented programming (OOP) approach is very much useful while designing and maintaining software programs. Object-oriented programming (OOP) is a basic programming paradigm that almost every developer has used at some stage in their career.
Constructor
The easiest way to think of a constructor in object-oriented programming (OOP) languages is:
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- 8. OOPS Theory #6 public class Car { public void horn() { System.out.println("Horn horn"); } } public class Ferrari extends Car { public void horn() { System.out.println("Ferarriiiiii"); } } public static void main(String[] args) { Ferrari ferrari = new Car(); ferrari.horn(); } Pick ONE option Horn horn Ferarriiii Cannot compile Runtime exception Clear Selection 9. OOPS Theory #7 In Java, we can achieve the abstraction by creating the blueprint of an object and only have abstract methods. What do we call this? Pick ONE option Interface Encapsulation Instance Protected Clear SelectionQUESTION 15 public class numClass { private int a; private static int y = 10; public numClass(int newX) {a=newx; } public void set(int newx) { a=newx; y+=a; } public void setY(int newy) { y=newY; } public static int getY() { return y; } }// end of class public class output { public static void main(String[] args) { numClass one = new numClass(10); numClass two = new numClass (2); try{ one. sety(30); two.set(4); if(one.getY()==30) throw new Exception ("30"); one.setY(40); } catch (Exception e) { two.sety (50); } System.out.println(two.getY()); }// end of main } // end of classclass 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
- Answer By True or False , JAVA LANGUAGE A Java interface can contain only constants and abstract methods. A class that implements an interface can define only the methods that are included in the interface. A static variable can be referenced only from a static method. Static variables are also called class variables.What is the output of the following code? Convert the abstract class into an interface and modify the codes in all classes that will maintain the same output. (Rewrite the code)public class Animal { public void makeNoise() { System.out.println("talk"); }//end method makeNoise }//end class Animal public class Dog extends Animal { public void makeNoise() { System.out.println("Bark"); }/lend method makeNoise }//end class Dog What would the output of the following be? Explain your answer. Animal animal = new Animal(); animal.makeNoise(); Dog dog = new Dog(); dog.makeNoise(); Animal animaldog = new Dog(); animaldog.makeNoise();
- public class Cat extends Pet { private String breed; public void setBreed(String userBreed) { breed = userBreed; } public String getBreed() { return breed; }} public class Pet { protected String name; protected int age; public void setName(String userName) { name = userName; } public String getName() { return name; } public void setAge(int userAge) { age = userAge; } public int getAge() { return age; } public void printInfo() { System.out.println("Pet Information: "); System.out.println(" Name: " + name); System.out.println(" Age: " + age); } } import java.util.Scanner; public class PetInformation { public static void main(String[] args) { Scanner scnr = new Scanner(System.in); // create a generic Pet and a Cat Pet myPet = new Pet(); Cat myCat = new Cat(); // declare variables for pet and cat info String petName, catName, catBreed; int petAge,…public class A { private int x; public int y; protected int z; public A() public class B extends A public class C { private int x; public int y; protected int z; public B() { x = 0; { private int x; public int y; private B z; private A w; public C() { z = new B () ; X = 0; } W = (A) z; Select correct statements assuming that defined classes belong to the same package (folder): variable x from A is accesible in C variable y from A is accesible in C variable z from A is accesible in B variable x from B is accesible in C variable y from A is accesible in B variable z from B is accesible in C variable z from A is accesible in C variable x from A is accesible in B variable y from B is accesible in C2. Consider the following class definitions: public class BClass } private int x; public void set(int a) } X a; { public void print() } System.out.print(x); { { public class DClass extends BClass } private int y; public void set(int a, int b) } //Postcondition: x =a; y=Db; { public void print( ) {.…} a. Write the definition of the print method of DClass that overrides it. b. Write the definition of the method set of the class DClass.
- toString() and equals() Methods This lab will demonstrate how the toString() and equals() methods work when they are not overridden. Type up the code and submit the BOTH results. CODE public class ObjectToString( public static void main(String[] args) { ClassOne co new ClassOne(); ClassTwo ct = new ClassTwo(); } } public class Classone { System.out.println(co); System.out.println(ct); System.out.println(co.equals(ct)); public void printfle() { System.out.println("I am from ClassOne"); } public class ClassTwo ( public void printMe() { } System.out.println("I am from ClassTwo"); Run the program and notice the output.Q 3: Different packages and access modifiers package package_02; public class ClassB { public int x - 1; int y = 2; private int z = public void myMethod () { System.out.print(x); System.out.print(y); System.out.print(z); 3; } package package_01; import package_02.classB; public class ClassA { public static void main(String[] args) { ClassB cb = new ClassB(); cb.myMethod (); } } 3.1- Which statement(s) are true? Choose all that apply. a. This code prints "123" to the output. b. If you remove the "public" modifier from the ClassB, the code writes "123" to the output. c. If you remove the "public" modifier from the method myMethod, the code prints "123" to the output. d. This code does not compile 3.2- What do you expect if you remove the public keyword from the ClassB (public class ClassB{.}}?Take a look at the class declaration below: package p1; class Test8{ package p2; import p1.Test8; package p3; import p1.Test8; import p2.Test9; int i; class Test9 extends Test8 { private int j; protected int k; public int I; } class TestDemo3{ public static void main(String args[]){ Test8 t8 = new Test8(); Test9 t9 = new Test9(); } Out of these 4 variables declared in Test8, which are accessible in Test9 directly and by creating Test8 reference? In TestDemo3 main function, which variables can be used by each of the references t8 and t9?