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java
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- Which (if any) of the following conditions are necessary for using polymorphism? Select all correct answers. The classes involved are in the same hierarchy. None of the classes can be abstract. All of the subclasses involved override the same method. The object reference cannot be of an interface type. An object reference of the superclass is used to call any methods. A superclass object is referenced by a subclass reference. Which of the following (if any) are true of abstract methods? Select all correct answers. Abstract methods must have a method body. Abstract methods cannot be declared in a class that isn't abstract itself. Abstract methods cannot be private or static. Abstract methods can only be declared in an interface. Abstract methods cannot be called. Constructor methods can be abstract.Which (if any) of the following conditions are necessary for using polymorphism? Select all correct answers. The classes involved are in the same hierarchy. None of the classes can be abstract. All of the subclasses involved override the same method. The object reference cannot be of an interface type. An object reference of the superclass is used to call any methods. A superclass object is referenced by a subclass reference. Which of the following (if any) are true of abstract methods? Select all correct answers. Abstract methods must have a method body. Abstract methods cannot be declared in a class that isn't abstract itself. Abstract methods cannot be private or static. Abstract methods can only be declared in an interface. Abstract methods cannot be called.Which of the following statement is not true? An anonymous inner class is compiled into a class named OuterClassName$InnerClassName.class An anonymous inner class must always extend a superclass or implement an interface, but it cannot have an explicit extends or implements clause. An anonymous inner class always uses the no-arg constructor from its superclass to create an instance. If an anonymous inner class implements an interface, the constructor is Object(). An anonymous inner class must implement all the abstract methods in the superclass or in the interface.
- What does the super keyword represents and where can it be used? Give an example of a superclass and subclass. Be sure to make all the instances variables of the super class private. Include at least one constructor in each class and ensure that the constructor of the subclass calls the constructor of the superclass. Also include a toString method in both classes that returns the values of the instance variables with appropriate labels. Ensure that the toString method of subclass calls the toString method of the superclass so that the string returned contains the values of all the inherited instance variables.There is a class, let's say the name is myClass, which has one attribute (member data) class named "status" with data type integer with access level "private". How to write the class declaration and its data members in the following languages: Java, C++, and Python?a. What is the concept of binding? Differentiate between early binding and late binding. (Write inmaximum 5 lines) [5 Marks]b. Write a Java operator/keyword, which can be used to check the validity of reference before attemptingdown-casting from superclass object to subclass reference. Given an example of it usage. (Write inmaximum 5 lines)
- (Keeping mutables safe) Suggest a simple scheme for creating a new classSafeMember that would allow us to export a reference to a Member. Theclasses outside the system should be unaware of this additional class, and accessthe reference like a reference to a Member object. However, the reference wouldnot allow the integrity of the data to be compromised.a- Prepare a MS. Word document that contain a UML represent a class ofyour choice, the class should satisfy the following properties:- Consists at least three private attributes.- Two constructors one with no arguments and one with arguments.- Getter and setter methods for all attributes.- Override the equals method.- implement the Comparable interface.- Override the toString methods to return a string which representsall object’s information.b- Implement the above class using java and NetBeans IDE.c- Create class called Test with main method to do the following:- Create ArrayList object.- Create the 4 objects of the above class, the information should readfrom input console.- Add the objects in the ArrayList object.- Display the information of all objects in the array list. I want different class than beforea- Prepare a MS. Word document that contain a UML represent a class ofyour choice, the class should satisfy the following properties:- Consists at least three private attributes.- Two constructors one with no arguments and one with arguments.- Getter and setter methods for all attributes.- Override the equals method.- implement the Comparable interface.- Override the toString methods to return a string which representsall object’s information.b- Implement the above class using java and NetBeans IDE.c- Create class called Test with main method to do the following:- Create ArrayList object.- Create the 4 objects of the above class, the information should readfrom input console.- Add the objects in the ArrayList object.- Display the information of all objects in the array list.
- Which one is true? A) An inner class can be declared public or private subject to the same visibility rules applied to a member of the class. B)An inner class can be declared static. A static inner class can be accessed using the outer class name. A static inner class cannot access non-static members of the outer class. C)An inner class supports the work of its containing outer class and is compiled into a class named OuterClassName$InnerClassName.class. D)Inner classes can make programs simple and concise.1) Change the visibility of the variables and constructor in the Employee class to be more secure 2) Add an Admin class with the following features: a) The Admin class is a child of the Employee class b) Admin objects have an instance string password variable c) The Admin class has a 4 parameter constructor. One parameter sets the string, the other three parameters are used as arguments for a parent constructor call. d) Admin objects have an instance getInformation() method with a void return and an Employee object parameter. The method will request the calling Admin’s password and check user input. If input matches the password, the method will display the information of the Employee parameter Please use ***C Sharp** Language to answer the codeThe decorator pattern is used when subclassing is not possible or practical to add functionality Select one: True False
