Question

4. Programming Problem: In this problem we will keep the Mechanism interface and the two classes Car and Computer from the previous problem. In addition, we will add a new class called Mechanic. We will also create a new TestMechanic class that will contain the main method.

1. Create a class called Mechanic with following instance variable and constants:

        private int cost;

        public static int TEST_PRICE = 10;

        public static int REPAIR_PRICE = 50;

Have a default constructor that will set cost to 0.

This class three methods : needRepair, howMuch and repair. These methods simulate the functions of a mechanic.

The methods are defined as follows. Complete the method body, as directed by the comments. We will model the Mechanic to be able to work on any Mechanism , which can be anything ( a Car or a Computer)

      public boolean needRepair(Mechanism m) {

               // include TEST_PRICE into the cost;

               /* call the reportProblem() method for mechanism m. If this

                Return is greater than 0, then return true, else return 

                false *

        }

        public void repair(Mechanism m) {

                //call the reportProblem method for mechanism m

               /* add to the cost, the value of REPAIR_PRICE * number of 

                   Problems returned by the reportProblem() method */

               // call the getFixed() method for mechanism m;

        }

        public int howMuch() {

               // set a variable charge = cost;

               //set cost = 0;

               //return charge;

        }

2. Write a class called TestMechanic that will create a new Mechanic object called smartGuy. Then ask the user if they want to repair a Car. If the user wants to repair a car then ask for values of the car’s parameters and create a new car object car1. Then, call the needRepair method for smartGuy and pass car1 as the parameter. If the return value of this needRepair method is true, call the repair method for smartGuy. Then call the howMuch method for smartGuy.

Then ask if the user wants to repair a computer. If yes, then ask for values of the computer’s parameters and create a new computer object called comp1. Then call the needRepair method for smartGuy and pass comp1 as a parameter.If the return value of this needRepair method is true , call the repair method for smartGuy. Then call the howMuch method for smartGuy.

Add the total values returned by the two howMuch methods and print it on the screen.

Answer 1

ans

Mechanic.java class

public class Mechanic
{
private int cost;
public static int TEST_PRICE=10;
public static int REPAIR_PRICE=50;

public Mechanic()
{
cost=0;
}
  
public boolean needRepair(Mechanism m)
{
cost+=TEST_PRICE;
return m.reportProblems()>0;
}
public void repair(Mechanism m)
{
int numberOfProblems=m.reportProblems();
cost+=REPAIR_PRICE*numberOfProblems;
m.getFixed();
}
public int howMuch()
{
int charge=cost;
cost=0;
return charge;
}
}

TestMechanic.java

import java.util.Scanner;
public class TestMechanic {

public static void main(String[] args)
{
String userAns;
Mechanic smartGuy=new Mechanic();
Scanner sc=new Scanner(System.in);
System.out.print("If you want to repair your car? (y/n) :");
userAns=sc.next();
if(userAns.equalsIgnoreCase("N"))
System.exit(0);
System.out.print("\nEnter the number of wheels your car have: ");
int numWheels=sc.nextInt();
System.out.print("Enter the brand of the car : ");
String brand=sc.next();
Car car1=new Car(brand, numWheels);
if(smartGuy.needRepair(car1))
{
smartGuy.repair(car1);
System.out.println("The mechanic cost is :$"+smartGuy.howMuch());
}
  
}
  
}

output

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