The Triangle class) Design a class named Triangle that extends GeomericObject. The class contains: Three double data fields named side1, side2, and side with default values 1.0 to denote three sides of the triangle.A no-arg constructor that creates a default triangle.A constructor that creates a triangle with the specific side1, side2, and side3.The accessor method for the three data fields.A method named getArea() that returns the area of this triangle.A method named getPerimeter() that returns the perimeter of this triangle.A method named toString() that returns a string description for the triangle.

1. RetailItem Class Write a class named Retailltem that holds data about an item in a retail store. The class should have the following fields: • description. It is a String object that holds a brief description of the item. • unitsOnHand. It is an int variable that holds the number of units currently in inventory. • price. It is a double that holds the item's retail price. Write appropriate mutator methods that store values in these fields and accessor methods that return the values in these fields. Once you have written the class, write a separate program that creates three RetailItem objects and stores the following data in them. Units On Hold Description Designer Jeans Jacket Price 40 34.95 12 59.95 Shirt 20 24.95

// Declare data fields: a String named customerName, // an int named numItems, and // a double named totalCost.// Your code here... // Implement the default contructor.// Set the value of customerName to "no name"// and use zero for the other data fields.// Your code here... // Implement the overloaded constructor that// passes new values to all data fields.// Your code here... // Implement method getTotalCost to return the totalCost.// Your code here... // Implement method buyItem.//// Adds itemCost to the total cost and increments// (adds 1 to) the number of items in the cart.//// Parameter: a double itemCost indicating the cost of the item.public void buyItem(double itemCost){// Your code here... }// Implement method applyCoupon.//// Apply a coupon to the total cost of the cart.// - Normal coupon: the unit discount is subtracted ONCE// from the total cost.// - Bonus coupon: the unit discount is subtracted TWICE// from the total cost.// - HOWEVER, a bonus coupon only applies if the…

1- Design a class named Rectangle to represent a Rectangle. The class contains: • three variables integer data field named height, integer data filed named width and integer data filed named length. The default values are 1 for height, length, and width are 1.0 for each of them respectively. • A no-arg constructor that creates a default Rectangle. • A constructor that creates a Rectangle with the specified height, length and width. • A method named getVolume() that returns the volume of this Rectangle. (Volume = height * width * length) %3! 2- Write a test program called Test Rectangle that: • Creates two Rectangle objects: one object with height 11, length 5, and width 7, the other object with height 10, length 2 and width 6 • Display the volume of each Rectangle object.