use java

use Java

Objectives of this lab: Students will understand the concept of classes. Students will write the definition of a class. Students will write definitions of member functions. Students will be able to use setter and getter. Task# 1 . Create a class to find the area of a triangle. The class includes: Two data Members: Base and Height. One member function to calculate the area of the triangle. Calculate area using class function. The formula is: 12 base x height In main: Give each data member a value. Ask and Display the base and height of triangle Display the area of the triangle in main function. . Task# 2 . Create a class to display personal information and check if the user is of legal driving age. The class includes: Three data members : First Name Last Name Year of birth A bool function to check if the user is old enough to drive a car. In main: Give each data member a value. Display personal information as "Your name is first name last name You were born in birth year" Decide whether the age is a legal driving age or not. If the age is 18 or greater than 18 then the following message should be printed out. "You are old enough to drive a car." Otherwise "You are not old enough to drive a car." Task# 3 Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. An Invoice should include four pieces of information as instance variables- 1- a part number type String), 2- a part description (type String), 3- a quantity of the item being purchased (type int) and 4- a price per item (double). . Your class should have this operator that initializes the four instance variables. Provide a set and a get method for each instance variable. . In addition, provide a method named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as a double value. If the quantity is not positive, it should be set to 0. If the price per item is not positive, it should be set to 0.0. Write a test application named InvoiceTest that demonstrates class Invoice's capabilities. Hints: The input values for the quantity and the price per item must be validated before they can be used to set the corresponding instance variables. This should be done both in the constructor and in the appropriate set methods. The method header for getInvoiceAmount should be public double getInvoiceAmount. Your output should appear as follows: Solution Original invoice information Part number: 1234 Description: Hammer Quantity: 2 Price: 14.95 Invoice amount: 29.90 Updated invoice information Part number: 001234 Description: Yellow Hammer Quantity: 3 Price: 19.49 Invoice amount: 58.47 Original invoice information Part number: 5678 Description: Paint Brush Quantity: 0 Price: 0.00 Invoice amount: 0.00 Updated invoice information Part number: 5678 Description: Paint Brush Quantity: 3 Price: 9.49 Invoice amount: 28.47 Task# 4 Create a class called Petrol Purchase to represent information about the petrol you purchase. The class should include five pieces of information in the form of instance variables: . . . The station's location (type String), The type of petrol (type String), The quantity (type int) of the purchase in liters, The price per liter (double), The percentage discount (double). . . Provide a set and a get method for each instance variable. In addition, provide a method named getPurchaseAmount that calculates the net purchase amount (i.e., multiplies the quantity by the price per liter) minus the discount, then returns the net amount you had to pay as a double value. Write an application class named Petrol that demonstrates the capabilities of class PetrolPurchase. I Objectives of this lab: Students will understand the concept of classes. Students will write the definition of a class. Students will write definitions of member functions. Students will be able to use setter and getter. Task# 1 . Create a class to find the area of a triangle. The class includes: Two data Members: Base and Height. One member function to calculate the area of the triangle. Calculate area using class function. The formula is: 12 base x height In main: Give each data member a value. Ask and Display the base and height of triangle Display the area of the triangle in main function. . Task# 2 . Create a class to display personal information and check if the user is of legal driving age. The class includes: Three data members : First Name Last Name Year of birth A bool function to check if the user is old enough to drive a car. In main: Give each data member a value. Display personal information as "Your name is first name last name You were born in birth year" Decide whether the age is a legal driving age or not. If the age is 18 or greater than 18 then the following message should be printed out. "You are old enough to drive a car." Otherwise "You are not old enough to drive a car." Task# 3 Create a class called Invoice that a hardware store might use to represent an invoice for an item sold at the store. An Invoice should include four pieces of information as instance variables- 1- a part number type String), 2- a part description (type String), 3- a quantity of the item being purchased (type int) and 4- a price per item (double). . Your class should have this operator that initializes the four instance variables. Provide a set and a get method for each instance variable. . In addition, provide a method named getInvoiceAmount that calculates the invoice amount (i.e., multiplies the quantity by the price per item), then returns the amount as a double value. If the quantity is not positive, it should be set to 0. If the price per item is not positive, it should be set to 0.0. Write a test application named InvoiceTest that demonstrates class Invoice's capabilities. Hints: The input values for the quantity and the price per item must be validated before they can be used to set the corresponding instance variables. This should be done both in the constructor and in the appropriate set methods. The method header for getInvoiceAmount should be public double getInvoiceAmount. Your output should appear as follows: Solution Original invoice information Part number: 1234 Description: Hammer Quantity: 2 Price: 14.95 Invoice amount: 29.90 Updated invoice information Part number: 001234 Description: Yellow Hammer Quantity: 3 Price: 19.49 Invoice amount: 58.47 Original invoice information Part number: 5678 Description: Paint Brush Quantity: 0 Price: 0.00 Invoice amount: 0.00 Updated invoice information Part number: 5678 Description: Paint Brush Quantity: 3 Price: 9.49 Invoice amount: 28.47 Task# 4 Create a class called Petrol Purchase to represent information about the petrol you purchase. The class should include five pieces of information in the form of instance variables: . . . The station's location (type String), The type of petrol (type String), The quantity (type int) of the purchase in liters, The price per liter (double), The percentage discount (double). . . Provide a set and a get method for each instance variable. In addition, provide a method named getPurchaseAmount that calculates the net purchase amount (i.e., multiplies the quantity by the price per liter) minus the discount, then returns the net amount you had to pay as a double value. Write an application class named Petrol that demonstrates the capabilities of class PetrolPurchase