Java Abstract classes can be defined without any abstract methods" - Support this statement with proper reasoning
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Java
Abstract classes can be defined without any abstract methods" - Support this statement with proper reasoning.
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- Abstract classes need their subclasses to implement their abstract methods. Is it true?Explain through each question about Classes and Objects in Java. What is encapsulations and why is it useful? What is an instance method and how does it differ from the static methods we learned previously? What is a mutator method? What is an accessor method? What is a constructor in a Java class? What is an implicit parameter? Please provide an entire coding example to illustrate the answer.This question reinforces concepts from Lab Practices 1 - 5. Best practice of Class and Method designshould be demonstrated. This will require a good understanding of class design concepts andmethod design concepts: code re-use, high cohesion and low coupling.Before attempting this question, complete the pre-requisiteslisted on the first page of this document.Assignment 1 uses O-O design implemented in Java. You will need to use a user-defined class, asan array of such class objects will be required.User-defined Class:You will design and implement your own data class. The class will store data that has been read asuser input from the keyboard (see Getting Input below), and provide necessary operations. As thedata stored relates to monetary change, the class should be named Change. The class requires atleast 2 instance variables for the name of a person and the coin change amount to be given to thatperson. You may also wish to use 4 instance variables to represent amounts for each of the…
- Write the Talker interface, Animal abstract class, plus the Dog, Cat, Fish, and Radio classes for this Java Program. Talker.java - the interface Talker, which has just one void method called speak() Animal.java - the abstract class Animal, which stores an animal's name. (No abstract methods). It should contain 2 methods: a constructor with 1 argument (the name) a method getName() which returns the name. Dog.java - the class Dog, which extends Animal and implements Talker. It should contain 3 methods: a constructor with no arguments, giving the dog a default name of "Fido" a constructor with 1 argument (the name) a speak() method that prints "Woof" on the screen. Use @Override Cat.java - the class Cat, which extends Animal and implements Talker. It should contain just 2 methods: a constructor with 1 argument (the name) (no default name like dogs have) a speak() method that prints "Meow" on the screen. Use @Override Fish.java - the class Fish, which is an Animal that…Write the definition of classes and interfaces in the given diagram using following details: a) Interface shape has a method draw(). b) Override the method draw() in all subclasses. c) Define a non-abstract method fillColor() in Circle class. (I want the complete solution using the codes in bluej program also diagram) bluej java coodConvert the UML class diagram above into a java code with the following conditions The methods in the Pet class are abstract. Create a class called test. The main() method in the test class should create three Cat objects and two Budgie The main() method should also create indirectly an object of the Pet class. Demonstrate polymorphism in your test
- Student Information: student_id, civil_id name, address, phone number, email (Class that contain overloaded method) 1.Draw the Class diagram(UML Diagram). 2.Write a JAVA program for Student Information using method overloading concept (Object Class and Driver Class)Using the class diagram in the image below, create customer, car, and parking lot classes for an object-oriented parking system. Classes should contain properties and method implementations. Use java to write your code. Add some attributes and methods of your own not included inside the class diagram Include a 200-word write-up to describe your implementation details and add screenshots of your code and outputYou need to perform following things to demonstrate the concept of abstract class. Step 1: Create the abstract class that has following methods. • Calculate the area of circle(Abstract method) • Calculate the area of triangle(Abstract method) • Calculate the area of rectangle(Method with implementation) Step 2: Create another class that extends above class and provide implementation of abstract methods. Step 3: Create the main method inside above class and display output of area of circle, area of triangle and area of rectangle. You need to submit the following things: • Java program with both the classes An output screenshot created using Microsoft Word
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