Question

7. Programming Problem: In this problem we are trying to model a repair service that can repair Cars and Computers. Even though the Car and Computer are different products, they have common repair methods that can be abstracted in an interface. Please complete the interface and the classes by adding the required methods, as per the problem description. Partially complete code is provided as shown below A. Create an interface called Mechanism. This interface has two methods. The first method called reRertPreblemsl) returns an int and takes in no parameters. The other method getFixed) returns a void and takes in no parameters. B. Create a class called Computer that implements the interface Mechanism. This class has the following instance variables and constants that depicts the properties of the computer public static final double MINREQUIREDSPEED = 2.0; public static final double MIN-REQUIRED CAPACITY 1.0; - - private double private double asneasisxi private sas networked; -This class has a full arg con -This class has getters for each instance variable. The getter for networked should be named -The class should simulate a repair process and hence it should be able to do the following *changeProcessor to a given new processor speed; to a given new memsrxsapasitw be able to connect, upon which the property networked is set to eb able to disconnect where networked is set to false The class should implement the methods specified in the interface as follows. These methods will check the computer's parameters and get the trouble fixed. In the [eportProblems method, number of troubles are tallied and reported as the return value as follows . If the Rcecessarse ed is less than the MİN REQUIRED-3 PEED , add one to the number *If the memscvSapacity is less than the MIN REQUIRED_CAEACITY, add one more to *If the computer is not networked, add another one to the number of gf troubles. Return of troubles the number of troubles the total number of troubles. In the getFixed method *If the esesSpee is less than the minimum required speed, then add the difference in speed.

Answer 1

Que 7)

Ans

Mechanism.java interface

public interface Mechanism
{
int reportProblems();
void getFixed();
}

Computer.java class

public class Computer implements Mechanism
{
public static final double MIN_REQUIRED_SPEED=2.0;
public static final double MIN_REQUIRED_CAPACITY=1.0;
private double processorSpeed;
private double memoryCapcity;
private boolean networked;

public Computer(double processorSpeed, double memoryCapcity, boolean networked) {
this.processorSpeed = processorSpeed;
this.memoryCapcity = memoryCapcity;
this.networked = networked;
}

public double getProcessorSpeed() {
return processorSpeed;
}

public double getMemoryCapcity() {
return memoryCapcity;
}

public boolean isNetworked() {
return networked;
}
  
public void changeProcessor(double newSpeed)
{
this.processorSpeed=newSpeed;
}
public void addMemoryCapacity(double newMemory)
{
this.memoryCapcity=newMemory;
}
public void connect(boolean mode)
{
this.networked=mode;
}  
@Override
public int reportProblems() {
int problemsCount=0;
if(processorSpeed<MIN_REQUIRED_SPEED)
problemsCount++;
if(memoryCapcity<MIN_REQUIRED_CAPACITY)
problemsCount++;
if(!isNetworked())
problemsCount++;
return problemsCount;
}

@Override
public void getFixed()
{
if(processorSpeed<MIN_REQUIRED_SPEED)
{
changeProcessor(processorSpeed+(MIN_REQUIRED_CAPACITY-MIN_REQUIRED_SPEED));
}
if(memoryCapcity<MIN_REQUIRED_CAPACITY)
{
addMemoryCapacity(memoryCapcity+(MIN_REQUIRED_CAPACITY-memoryCapcity));
}
if(!isNetworked())
connect(true);
}
}

Car.java

public class Car implements Mechanism
{
public static final int RIGHT_NUM_WHEELS=4;
public static final String PROBLEMATIC_BRAND = "Daewoo";
public static final String GOOD_BRAND="BW";
  
private String brand;
private int numOfWheels;

public Car(String brand, int numOfWheels) {
this.brand = brand;
this.numOfWheels = numOfWheels;
}

public String getBrand() {
return brand;
}

public int getNumOfWheels() {
return numOfWheels;
}

@Override
public int reportProblems() {
int troubles=0;
if(numOfWheels<RIGHT_NUM_WHEELS)
troubles=RIGHT_NUM_WHEELS-numOfWheels;
if(brand==PROBLEMATIC_BRAND)
troubles++;
return troubles;
}
  

@Override
public void getFixed()
{
if(numOfWheels<RIGHT_NUM_WHEELS)
{
numOfWheels+=RIGHT_NUM_WHEELS-numOfWheels;
}
if(brand==PROBLEMATIC_BRAND)
brand=GOOD_BRAND;
}
  
}

Repair.java

import java.util.Scanner;
public class Repair
{
public static void main(String[] args)
{
String userAns;
Scanner sc=new Scanner(System.in);
System.out.print("If you need to service somethind? (y/n) :");
userAns=sc.next();
if(userAns.equalsIgnoreCase("N"))
System.exit(0);
System.out.println("\n\n1) Computer\n2) Car");
System.out.print("\nYour choice: ");
userAns=sc.next();
if(userAns.equals("1"))
{
boolean network=false;
System.out.print("\nyEnter the the Processor's Speed: ");
double speed=sc.nextDouble();
System.out.print("Enter memory capacity: ");
double capacity=sc.nextDouble();
System.out.print("If you computer is networked ?(y/n):");
String net=sc.next();
if(net.equalsIgnoreCase("Y"))
network=true;
Computer cp1=new Computer(speed, capacity, network);
if(cp1.reportProblems()>0)
{
System.out.println("\nYour computer has "+cp1.reportProblems()+" problmes and its fixed.");
cp1.getFixed();
}
else
System.out.println("\nYour computer has no problems");
}
if(userAns.equals("2"))
{
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 c1=new Car(brand, numWheels);
if(c1.reportProblems()>0)
{
System.out.println("\nYour car has "+c1.reportProblems()+" problems and its fixed.");
c1.getFixed();
}
else
{
System.out.println("\nYour car has no problems");
}
}
}
}

outputs

Mechanism Interface- NetBeans IDE 8.0.1 File Edit View Navigate Source Refactor Ru Debug Profile Team Iools Window Help Search (Ctrl+1) <defoult config> Output Debugger Console Mechanism Interface (run) x un If you need to service somethind? (Y/n)Y 1) Computer 2) Car Your choice: 1 Enter the the Processor's Speed: 1 Enter memory capacity: 2 If you computer is networked ? (y/n) in Your computer has 2 promles and its fixed BUILD SUCCESSFUL (total time: 23 seconds) ④ Notifications Bookmarks Output Creates log fie for future value calculation (run) #2 18:34 INS 03:11 O Type here to search rP ^脈偏恤 ENG 01-04-2019

Mechanism Interface- NetBeans IDE 8.0.1 File Edit View Navigate Source Refactor Ru Debug Profile Team Iools Window Help Search (Ctrl+1) <defoult config> Output Debugger Console Mechanism Interface (run) x un If you need to service somethind? y/n) Y 1) Computer 2) Car Your choice: 2 Enter the number of wheels your car have:2 Enter the brand of the carBMW Your car has 2 problems and its fixed BUILD SUCCESSFUL (total time: 1l seconds) ④ Notifications Bookmarks Output Creates log fie for future value calculation (run) #2 (1 more) 44:84 INS 03:12 O Type here to search rP ^脈偏恤 ENG 01-04-2019

que 8

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

Mechanism Interface - NetBeans IDE 8.0.1 File Edit View Navigate Source Refactor Run Debug Profile Team Tools Window Help Search (Ctrl+1) <defoult config> Output Debugper ConslemInterface (un If you want to repair your car? (/n) y un: Enter the number of wheels your car have: 3 Enter the brand of the car BMW The mechanic cost is :60 BUILD SUCCESSFUL (total time: 9 seconds) 叱 İ) Notifications g> Bookmarks [5Output Creates log fie for future value calculation (u) #2 I (more) 7:24 INS 03:30 O Type here to search oR ^后偏甸4x ENG 01-04-2019 2
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