Answer with True or False for the following. Explain your answers. -It is legal to write a method in a class which overloads another method declared in the same. -It is legal to write a method in a superclass which overrides a method declared in a sub-class.
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Answer with True or False for the following. Explain your answers.
-It is legal to write a method in a class which overloads another method declared in the same.
-It is legal to write a method in a superclass which overrides a method declared in a sub-class.
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- Answer all of the following questions as they are connected altogether: 3. How can we access the class members?4. Explain static members and static methods.5. Explain method overloading with example.Assume B is a subclass of A. Which of the statements about the following assignment is false? A a = new B(); We can assign anything to variable a that has a subtype of B. We can call on a any method defined in A. We can call on a any method defined in B. We can assign anything to variable a that has a subtype of A.Please answer the following Java-related questions. a) a car class has an has-a relationship with the vehicle class: True or false? b) In java, when a subclass redefines a superclass by using the same signature (same name and same parameters) the subclass is said to overload that superclass method : True or false c) the variable that cannot be modified (cannot change its value) after being initialized is called.....
- Write a Java operator/keyword, which can be used to check the validity of reference before attempting down-casting from superclass object to subclass reference. Given an example of it usage. (Write in maximum 5 lines) Assume you have a method expecting the superclass's object to be passed as an argument. In this case, if you give it an object of subclass rather than superclass. Is it acceptable? Why or why not? (Write in maximum 5 lines)1. Creating overloaded methods with identical sets of parameters and different return types result in compilation errors. Overloaded methods must have different sets of parameters- also known as signatures. Is it True or False? 2. Attempting to modify a final instance variable after it is initialized is a compilation error. Is it True or False? 3. A subclass can effect state changes in superclass private members only through public, protected methods provided in the superclass and inherited into the subclass. Is it True or False?Define a class called Country. A Country has populationSize, area, capital, currency, and abbreviation (2-3 letters taken from the country name). Define at least two constructors, at least two getter methods, at least two setter methods, and Override the toString() and the equals() methods. The equals() method must return true if the two countries have the same name and same populationSize and false otherwise. The abbreviation is the first letter and the second letter of the country name and must be generated automatically (e.g. if the country name is Palestine the abbreviation is PA, if the country name is Jordan the abbreviation is JO.) Write a main method, define an array of country objects, read countries data from the user, if two countries have the same abbreviation add the last letter from the country name to the abbreviation of the country inserted last. Display countries whose area is greater than 10000 km2.
- What is the superclass and what is the subclass in the following line? public class Pet extends DogDefine a class called Country. A Country has population S ize, area, capital, currency, and abbreviation ( (2-3 letters taken from the country name). Define at least two constructors, at least two getter methods, at least two setter methods, and Override the toString() method and the equals() method. The equals() method must return true if the two countries have the same name and same area and false otherwise The abbreviation is the first letter and the letter before the last of the country name and must be generated automatically eg if the country name is Palestine the abbreviation is PN, if the country name is Jordan the abbreviation is JA) Write a main method, define an array of country objects, read countries data from the user, if two countries have the same abbreviation add the last letter from the country name to the abbreviation o one million. f the country inserted last Display countries whose populationSize is greater thanWrite a class named Employee which implements Comparable Interface with name and salary as data fields Add a constructor with argument name and salary. Add getter and Setter for name and salary. Add CompareTo() method for the data Salary. Write a class named Manager which inherits the Employee class. Add an instance variable, named department, of type String. Add a constructor in the subclass class with arguments name, salary, department and a toString() method that prints the manager’s name, department, and salary [Hint: Add a toString( ) method in the super class as well] Create 3 objects of Manager with following arguments 1. (Zayed, 500), 2. ( Ahmed, 700) 3. ( Faisal, 600) Add the above 3 objects into an ArrayLIst object and Sort by Salary and Display. Create an object Employee class with (Zayed, 500,IT) and display the 1. Name 2. Salary 3. Department by using tostring() method.
- Match the following: A class that contains no methods (other than constructors) that change any of the data in its object modifier means that there are no restrictions on where an instance variable or method can be used hiding implementation details is done by marking data and methods as When we call a method in Java using class type parameters Overloading is achieved when two or more methods in the same class have the same…Please answer all of the following questions as they are linked altogether:2. Explain Field and method declaration with example.3. How can we access the class members?4. Explain static members and static methods.5. Explain method overloading with example.Which of the following statements are true. a) An abstract method contains a signature but no code implementation. b) We cannot create an instance of an abstract class by using the new operator. c) We can derive classes from an abstract class, but we must provide code to implement all of the abstract methods. d) All of the above statements are true.