Chapter 11 Exercise 6, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

11.6 (Use ArrayList) Write a program that creates an ArrayList and adds a Loan
object, a Date object, a string, and a Circle object to the list, and use a loop
to display all the elements in the list by invoking the object’s toString()
method.

import java.util.ArrayList;
import java.util.Date;

public class Account {

    protected String mName;
    protected int mId;
    protected double mBalance;
    protected double mAnnualInterestRate; // AnnualInterestRate is percentage.
    protected Date mDateCreated;
    protected ArrayList<Transaction> mTransactions;


    public Account() {
        mDateCreated = new Date();
        mTransactions = new ArrayList<>();
    }

    public Account(int id, double balance) {
        this();
        mId = id;
        mBalance = balance;
    }

    public Account(String name, int id, double balance) {
        this(id, balance);
        mName = name;

    }

    public int getId() {
        return mId;
    }

    public void setId(int id) {
        mId = id;
    }

    public double getBalance() {
        return mBalance;
    }

    public void setBalance(double balance) {
        mBalance = balance;
    }

    public double getAnnualInterestRate() {
        return mAnnualInterestRate;
    }

    public void setAnnualInterestRate(double annualInterestRate) {
        mAnnualInterestRate = annualInterestRate;
    }

    public Date getDateCreated() {
        return mDateCreated;
    }

    public double getMonthlyInterestRate() {
        return mBalance * (mAnnualInterestRate / 12) / 100;
    }

    public void withdraw(double amount) {
        mTransactions.add(new Transaction('W', amount, mBalance, "withdraw"));
        mBalance -= amount;
    }

    public void deposit(double amount) {
        mTransactions.add(new Transaction('D', amount, mBalance, "deposit"));
        mBalance += amount;
    }

    @Override
    public String toString() {
        return "Account name: " + mName + "\n" + "Interest rate: " + mAnnualInterestRate + "\n" + mTransactions;
    }

    public ArrayList<Transaction> getTransactions() {
        return new ArrayList<>(mTransactions);
    }

}

import javafx.scene.shape.Circle;

public class Circle2D  extends GeometricObject {

    private double x;
    private double y;
    private double radius;

    public Circle2D(Circle c) {
        this(c.getCenterX(), c.getCenterY(), c.getRadius());
    }
    public Circle2D(double x, double y, double radius) {
        this.x = x;
        this.y = y;
        this.radius = radius;
    }

    public Circle2D() {
        this(0, 0, 1);
    }

    public double getX() {
        return x;
    }

    public void setX(double x) {
        this.x = x;
    }

    public double getY() {
        return y;
    }

    public void setY(double y) {
        this.y = y;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    @Override
    public double getArea() {
        return radius * radius * Math.PI;
    }

    @Override
    public double getPerimeter() {

        return 2 * radius * Math.PI;

    }



    public boolean contains(Circle2D circle2D) {
        double distance = getPoint().distance(circle2D.x, circle2D.y);

        if (distance <= Math.abs(this.radius - circle2D.radius)) {
            return true;
        } else {
            return false;
        }
    }

    public static boolean c1ContainsC2(Circle c1, Circle c2) {
        Circle2D cir1 = new Circle2D(c1);
        Circle2D cir2 =new Circle2D(c2);

        return cir1.contains(cir2);
    }

    public static boolean c1OverlapsC2(Circle c1, Circle c2) {
        Circle2D cir1 = new Circle2D(c1);
        Circle2D cir2 =new Circle2D(c2);

        if (cir1.contains(cir2) || cir2.contains(cir1)) return false;

        return cir1.overlaps(cir2);
    }

    public boolean overlaps(Circle2D circle2D) {
        double distance = getPoint().distance(circle2D.x, circle2D.y);

        if (distance  <= this.radius + circle2D.radius)
            return true;
        else
            return false;

    }

    private MyPoint getPoint() {
        return new MyPoint(this.x, this.y);
    }

    @Override
    public String toString() {
        return "Circle2D{" +
                "x=" + x +
                ", y=" + y +
                ", radius=" + radius +
                '}';
    }

    public boolean contains(double x, double y) {

        double distance = getPoint().distance(x, y);

        if (distance <= radius) return true;
        else return false;
    }
}

import java.util.ArrayList;
import java.util.Date;

public class Exercise_06 {

    public static void main(String[] args) {

        ArrayList<Object> list = new ArrayList<>();

        list.add(new Circle2D());
        list.add("Hello I'm a string");
        list.add(new Date());
        list.add(new Account(111, 230));

        list.forEach(System.out::println);

    }

}

Chapter 11 Exercise 5, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

11.5  (The Course class) Rewrite the Course class in Listing 10.6. Use an ArrayList
to replace an array to store students. Draw the new UML diagram for the class.
You should not change the original contract of the Course class (i.e., the definition
of the constructors and methods should not be changed, but the private
members may be changed.)

import java.util.ArrayList;

public class Exercise_05 {

    // modified Course class below
}

class Course {

    private String courseName;
    private ArrayList<String> students = new ArrayList<>();

    public Course(String courseName) {
        this.courseName = courseName;
    }

    public void addStudent(String student) {

        students.add(student);
    }

    public String[] getStudents() {
        return students.toArray(new String[students.size()]);
    }

    public int getNumberOfStudents() {
        return students.size();
    }

    public String getCourseName() {
        return courseName;
    }

    public void dropStudent(String student) {

        students.remove(student);

    }

    public void clear(){
        students.clear();
    }

}

Chapter 11 Exercise 4, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

11.4 (Maximum element in ArrayList) Write the following method that returns the maximum value in an ArrayList of integers. The method returns null if the
list is null or the list size is 0.
public static Integer max(ArrayList<Integer> list)
446 Chapter 11 Inheritance and Polymorphism
Write a test program that prompts the user to enter a sequence of numbers ending
with 0, and invokes this method to return the largest number in the input.

import java.util.ArrayList;
import java.util.Scanner;
 

public class Exercise_04 {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in);
        ArrayList<Integer> list = new ArrayList<>();
        System.out.print("Enter input end with zero to stop: ");
        int temp;
        do {
            temp = input.nextInt();
            if (temp != 0) {
                list.add(temp);
            }
        } while (temp != 0);

        System.out.println("Max number is " + max(list));
    }

    public static Integer max(ArrayList<Integer> list) {

        if (list == null || list.isEmpty()) return null;

        int max = list.get(0);
        for (int i : list) {
            if (i > max) {
                max = i;
            }
        }

        return max;

}


}

Chapter 11 Exercise 3, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

11.3 (Subclasses of Account) In Programming Exercise 9.7, the Account class was
defined to model a bank account. An account has the properties account number,
balance, annual interest rate, and date created, and methods to deposit and withdraw
funds. Create two subclasses for checking and saving accounts. A checking
account has an overdraft limit, but a savings account cannot be overdrawn.
Draw the UML diagram for the classes and then implement them. Write
a test program that creates objects of Account, SavingsAccount, and
CheckingAccount and invokes their toString() methods.

import java.util.ArrayList;
import java.util.Date;

public class Account {

    protected String mName;
    protected int mId;
    protected double mBalance;
    protected double mAnnualInterestRate; // AnnualInterestRate is percentage.
    protected Date mDateCreated;
    protected ArrayList<Transaction> mTransactions;


    public Account() {
        mDateCreated = new Date();
        mTransactions = new ArrayList<>();
    }

    public Account(int id, double balance) {
        this();
        mId = id;
        mBalance = balance;
    }

    public Account(String name, int id, double balance) {
        this(id, balance);
        mName = name;

    }

    public int getId() {
        return mId;
    }

    public void setId(int id) {
        mId = id;
    }

    public double getBalance() {
        return mBalance;
    }

    public void setBalance(double balance) {
        mBalance = balance;
    }

    public double getAnnualInterestRate() {
        return mAnnualInterestRate;
    }

    public void setAnnualInterestRate(double annualInterestRate) {
        mAnnualInterestRate = annualInterestRate;
    }

    public Date getDateCreated() {
        return mDateCreated;
    }

    public double getMonthlyInterestRate() {
        return mBalance * (mAnnualInterestRate / 12) / 100;
    }

    public void withdraw(double amount) {
        mTransactions.add(new Transaction('W', amount, mBalance, "withdraw"));
        mBalance -= amount;
    }

    public void deposit(double amount) {
        mTransactions.add(new Transaction('D', amount, mBalance, "deposit"));
        mBalance += amount;
    }

    @Override
    public String toString() {
        return "Account name: " + mName + "\n" + "Interest rate: " + mAnnualInterestRate + "\n" + mTransactions;
    }

    public ArrayList<Transaction> getTransactions() {
        return new ArrayList<>(mTransactions);
    }

}

public class CheckingAccount extends Account {

    protected double OVERDRAFT_LIMIT = -100;

    public CheckingAccount(int id, double balance) {
        super(id, balance);
    }

    @Override
    public void withdraw(double amount) {
        if (mBalance - amount >= OVERDRAFT_LIMIT) {
            super.withdraw(amount);
        }
    }

    @Override
    public String toString() {
        return "CheckingAccount{"+
                "mBalance=" + mBalance +
                '}';
    }
}

public class SavingsAccount extends Account {

    protected double OVERDRAFT_LIMIT = 0;

    public SavingsAccount(int id, double balance) {
        super(id, balance);
    }

    @Override
    public void withdraw(double amount) {
        if (mBalance - amount >= OVERDRAFT_LIMIT) {
            super.withdraw(amount);
        }
    }

    @Override
    public String toString() {
        return "SavingsAccount{" +
                "mBalance=" + mBalance +
                '}';
    }
}

public class Exercise_03 {

    public static void main(String[] args) {

        Account account = new Account(111, 200);
        CheckingAccount checkingAccount = new CheckingAccount(112, 250);
        SavingsAccount savingsAccount = new SavingsAccount(113, 300);

        System.out.println(account);
        System.out.println(checkingAccount);
        System.out.println(savingsAccount);
    }

}

Chapter 11 Exercise 2, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

11.2 (The Person, Student, Employee, Faculty, and Staff classes) Design a
class named Person and its two subclasses named Student and Employee.
Make Faculty and Staff subclasses of Employee. A person has a name,
address, phone number, and email address. A student has a class status (freshman,
sophomore, junior, or senior). Define the status as a constant. An employee has
an office, salary, and date hired. Use the MyDate class defined in Programming
Exercise 10.14 to create an object for date hired. A faculty member has office
hours and a rank. A staff member has a title. Override the toString method in
each class to display the class name and the person’s name.
Draw the UML diagram for the classes and implement them. Write a test program
that creates a Person, Student, Employee, Faculty, and Staff, and
invokes their toString() methods.

public class Person {

    protected String name;
    protected String address;
    protected String phoneNumber;
    protected String email;

    public Person(String name) {
        this.name = name;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }

    public String getPhoneNumber() {
        return phoneNumber;
    }

    public void setPhoneNumber(String phoneNumber) {
        this.phoneNumber = phoneNumber;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    @Override
    public String toString() {
        return "Name: " + getName() + " Class: " + this.getClass().getName();
    }
}

public class Student extends Person {

    public static final String FRESHMAN = "Freshman";
    public static final String SOPHOMORE = "Sophomore";
    public static final String JUNIOR = "Junior";
    public static final String SENIOR = "Senior";

    protected String status;

    public Student(String name) {
        super(name);
    }

    public Student(String name, String status) {
        super(name);
        this.status = status;
    }

    @Override
    public String toString() {
        return "Name: " + getName() + " Class: " + this.getClass().getName();
    }
}

public class Employee extends Person {

    protected double salary;
    protected String office;
    protected MyDate dateHired;

    public Employee(String name) {
        this(name, 0, "none", new MyDate());
    }

    public Employee(String name, double salary, String office, MyDate dateHired) {
        super(name);
        this.salary = salary;
        this.office = office;
        this.dateHired = dateHired;
    }

    public double getSalary() {
        return salary;
    }

    public void setSalary(double salary) {
        this.salary = salary;
    }

    public String getOffice() {
        return office;
    }

    public void setOffice(String office) {
        this.office = office;
    }

    public MyDate getDateHired() {
        return dateHired;
    }

    public void setDateHired(MyDate dateHired) {
        this.dateHired = dateHired;
    }

    @Override
    public String toString() {
        return "Name: " + getName() + " Class: " + this.getClass().getName();
    }
}

public class Faculty extends Employee {

    public static String LECTURER = "Lecturer";
    public static String ASSISTANT_PROFESSOR = "Assistant Professor";
    public static String ASSOCIATE_PROFESSOR = "Associate Professor";
    public static String PROFESSOR = "Professor";

    protected String officeHours;
    protected String rank;

    public Faculty(String name) {
        this(name, "9-5PM", "Employee");
    }

    public Faculty(String name, String officeHours, String rank) {
        super(name);
        this.officeHours = officeHours;
        this.rank = rank;
    }

    public String getOfficeHours() {
        return officeHours;
    }

    public void setOfficeHours(String officeHours) {
        this.officeHours = officeHours;
    }

    public String getRank() {
        return rank;
    }

    public void setRank(String rank) {
        this.rank = rank;
    }

    @Override
    public String toString() {
        return "Name: " + getName() + " Class: " + this.getClass().getName();
    }
}

public class Staff extends Employee {

    protected String title;

    public Staff(String name) {
        this(name, "none");

    }

    public Staff(String name, String title) {
        super(name);
        this.title = title;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    @Override
    public String toString() {
        return "Name: " + getName() + " Class: " + this.getClass().getName();
    }
}

public class Exercise_02 {

    public static void main(String[] args) {

        Person person = new Person("person");
        Student student = new Student("student");
        Employee employee = new Employee("employee");
        Faculty faculty = new Faculty("faculty");
        Staff staff = new Staff("staff");

        System.out.println(person.toString());
        System.out.println(student.toString());
        System.out.println(employee.toString());
        System.out.println(faculty.toString());
        System.out.println(staff.toString());

    }


}