Question 7. Assuming a Circle class contains a single instance variable radius and the setters, getters and constructors are all defined, what is the value of result when the following client code is executed? Circle c = new Circle (4) ; 2 Circle d- c; d. setRadius (d. getRadius () + 2); int result = c. getRadius (); 3 4 А. О В. 2 С. 4 D. 6 E. None of the above
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- The interface Range is defined below:public interface Range{ void setLimits(int x, int y); int getNumber();}Implementations of Range should exhibit the following behaviour:• The setLimits method should store its parameter values somewhere to serve as the lower and upper limits of the range appropriately.• A call to getValue should return an integer that is always greater than or equal to the lower limit and less than or equal to the upper limit.The class RandomInteger is an implementation of the interface Range. It also has the following features:• It has two fields of int type, low and high, to record the lower and upper limits of the range, respectively.• It has single constructor method that takes two integers and stores them in the appropriate fields. Note: You should make use of the setLimits method.• A call to the method getNumber should return a random number that is always within the range, i.e. greater than or equal to the lower limit and less than or equal to the upper limit.…Hints: • For each class, it is required to implement constructors, setters, getters, toString() method, and any other necessary method • If the user tries to do an operation that could violate the state of objects, the operation should be ignored and the application should display an error message (e.g. adding a passenger to the same trip twice, etc.) Checking equality of any 2 objects should be done via the equals() method • • Testing: After implementing the required classes, design and implement a testing class to test them as follows: There is a class that will do the main job of as follows: o It has one collection to store the whole data (all trips) o It has static methods, one for each operation happens frequently o For each adding or removing operation, a message should be displayed to the user to explain the status of the operation (i.e. if it was successful or not) • Create at least 7 trips in at least 3 different dates and add them to the collection that stores the whole data…Modified Circle class and test file: Add a new attribute for color (or any other new attribute) Add get/set methods for this new instance variable, including data validation in set method (assuming background is black, i.e. circle color can't be black, reset to any non-black color if black is entered ). Add a new constructor to pass the color attribute as an argument. Add an instance method to display all properties of a Circle object. Create 2 objects using different constructors in test file, with invalid data. Use this test java file test java file: class CircleTest{ public static void main(String[] args){ int num = 10; Circle c1 = new Circle(0.001); Circle c2 = new Circle("black", -9); c1.display(); c2.display(); c1.setRadius( -1); c1.setColor("black"); c1.display(); }}
- Design a LandTract class that has two fields (i.e. instance variables): one for the tract’s length(a double), and one for the width (a double). The class should have: a constructor that accepts arguments for the two fields a method that returns the tract’s area(i.e. length * width) an equals method that accepts a LandTract object as an argument. If the argument object holds the same data (i.e. length and width) as the calling object, this method should return true. Otherwise, it should return false. a toString method (that returns a String representation of the tract’s length, width, and area). Demonstrate the class in a program by creating an array of three LandTract objects initialized with user input. Then, print the info of the LandTract objects stored in the array by invoking the toString method (implicitly or explicity). Also, use the equals method to compare at least two LandTract objects and print wether they are of equal size or not. Sample Output:…Complete method __init__ in the following class. (It's only missing an assignment to a radius instance variable.)Lab Goal : This lab was designed to teach you more object oriented programming and start you down the path of creating larger programs and games like BlackJack and Elevens [ one of the new AP CS A Labs ]. You will create a Deck class that contains a List < Card >Lab Description : You need to design a class that contains an instance variables which is a List < Card > and an int that keeps track of the top card position . You then need to make a constructor and related methods. You will need a dealCard method and a shuffle method. Use the template shown below. /make a Deck classpublic static final int NUMCARDS = 52;public static String[] SUITS = "CLUBS HEARTS DIAMONDS SPADES".split(" ");private List<Card> cards;private int top;//make a Deck constructor//refer cards to new ArrayList//set top to the top of the deck 51//loop through all suits//loop through all faces 1 to 13//add a new BlackJackCard to the deck//make a dealCard() method that returns the top card//write…
- The class "Plant" has the following attributes: name (String), family (String), lifeSpan (int). Write a constructor method for the "Plant" class that takes values as parameters for all these attributes. A- BI II !!Rectangle Object Monitoring Create a Rectangle class that can compute the total area of all the created rectangle objects using static fields (variables). Remember that a Rectangle has two attributes: Length and Width. Implement the class by creating a computer program that will ask the user about three rectangle dimensions. The program should be able to display the total area of the three rectangle objects. For this exercise, you are required to apply all OOP concepts that you learned in class. Sample output: Enter Length R1: 1 Enter Width R1: 1 Enter Length R2: 2 Enter Width R2: 2 Enter Length R3: 3 Enter Width R3: 3 The total area of the rectangles is 14.00 Note: All characters in boldface are user inputs.class City(object): county = "Lake" population = 3000000 def -_init__(self, name, state): self.name = name self.state = state def region(self): return "Midwest" a) create an instance of this object, called X, for Chicago, Illinois b) return the population of the instance X c) change the county of the instance X from Lake to Cook d) return the name of the state of the instance X d) call the method region() on the instance X
- Define the Student class that has two attributes: name and gpa Implement the following instance methods: A constructor that sets name to "Defualt name"(What ever you want to give) and gpa to 1.0 set_name(self, name) - set student's name to parameter name get_name(self) - return student's name set_gpa(self, gpa) - set student's gpa to parameter gpa get_gpa(self) - return student's gpa Ex. If a new Student object is created, the default output is: Default name/1.0 Ex. If the student's name is set to "Frank" and the gpa is set to 3.7, the output becomes: Frank/3.71. Part 1: A point in the x-y plane is represented by its x-coordinate and y-coordinate. Design the class Point that can store and process a point in the x-y plane. Your class should contains the following methods. Default constructor without parameters that initializes the private data member to the suitable values Constructor with parameters sets the values of the instance variables to the values of the parameter. Accessor methods that return the values of the x-axis and y-axis. setPoint method which set the values of x-axis and y-axis makeCopy method that make a copy of a received object of type Point. getCopy method that returns a copy of the current object toString method that returns the object string isEqual that returns true if the current object is equal to the received object of type point distance, which receives two objects of type Point and returns the distanceThe class "Car" has the following attributes: plate (String), mark (String), model (String), year (int), km (int).Write a constructor method for the "Car" class that takes values as parameters for all these attributes.