DCT1093 OOP. LAB. Creating Object and Class

1. (The Rectangle class) Design a class named Rectangle to represent a rectangle. The class contains:
Two double data fields named width and height that specify the width and height of the rectangle. The default values are 1 for both width and height.

A string data field named color that specifies the color of a rectangle. Hypothetically, assume that all rectangles have the same color. The default color is white.

A no-arg constructor that creates a default rectangle.

A constructor that creates a rectangle with the specified width and height.

The accessor and mutator methods for all three data fields.

A method named getArea() that returns the area of this rectangle.

A method named getPerimeter() that returns the perimeter.

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public class lab17sept2016 {
   
    public static void main(String[] args) {
    // cara bina objek
       
    Rectangle segi4    = new Rectangle();
    System.out.println(segi4.color);
    System.out.println(segi4.height);
    System.out.println(segi4.width);
   
    Rectangle segiempat    = new Rectangle(10,15);
    System.out.println(segiempat.color);
    System.out.println(segiempat.height);
    System.out.println(segiempat.width);
   
    }
}

class Rectangle{
double width=1;
double height=1;
String color="white";

//A no-arg constructor that creates a default rectangle.
Rectangle(){
}

//A constructor that creates a rectangle with the specified width and height
Rectangle(double newWidth, double newheight){
width = newWidth;
height = newheight;
}

//The accessor (get) and mutator(set) methods for all three data fields.
double getwidth(){
return width;
}

double getheight(){
return height;
}
String getcolor(){
return color;
}

void setwidth(double newWidth){
width =newWidth;
}

void setheight(double newheight){
height =newheight;
}
void setcolor(String newColor){
color = newColor;
}

double getArea(){
return (width * height)    ;
}
double getPerimeter(){
return (2*(width + height))    ;
}


}





2. (The Account class) Design a class named Account that contains:
An int data field named id for the account (default 0).

A double data field named balance for the account (default 0).

A double data field named annualInterestRate that stores the current interest rate (default 0).

A Date data field named dateCreated that stores the date when the account was created.

A no-arg constructor that creates a default account.

The accessor and mutator methods for id, balance, and annualInterestRate.

The accessor method for dateCreated.

A method named getMonthlyInterestRate() that returns the monthly interest rate.

A method named withDraw that withdraws a specified amount from the account.

A method named deposit that deposits a specified amount to the account.

Draw the UML diagram for the class. Implement the class. Write a test program that creates an Account object with an account ID of 1122, a balance of 20000, and an annual interest rate of 4.5%. Use the withdraw method to withdraw $2500, use the deposit method to deposit $3000, and print the balance, the monthly interest, and the date when this account was created.

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public class Test {

  public static void main (String[] args) {

    Account account = new Account(1122, 20000);

    Account.setAnnualInterestRate(4.5);

    

    account.withdraw(2500);

    account.deposit(3000);

    System.out.println("Balance is " + account.getBalance());

    System.out.println("Monthly interest is " +

    account.getMonthlyInterest());

    System.out.println("This account was created at " +

      account.getDateCreated());

  }

}

Class Account {

  // Implement the class here

}