Help! Help!

[kevzspeare]

Here are three Java files:

Rental.java

public class Rental extends Main_Rental
{
 String[] ID=new String[35];
 int[] RentalDays=new int[35];
 float[] RatePerDay=new float[35];
 String[] car=new String[35];
 
 String UserID;
 int DaysOfRental;
 float RentalRatePerDay;
 String carName;
 
 public Rental(String id,String category,int days)
 {
  UserID=id;
  carName=category;
  DaysOfRental=days;
 }
 
 public void economyCar()
 {
  carName="economyCar";
  RentalRatePerDay=110f;
 }
 
 public void compactCar()
 {
  carName="compactCar";
  RentalRatePerDay=125f;
 }
 
 public void miniCar()
 {
  carName="miniCar";
  RentalRatePerDay=100f;
 }
 
 public void standardCar()
 {
  carName="standardCar";
  RentalRatePerDay=150f;
 }
 
 public void fullSizeCar()
 {
  carName="fullSizeCar";
  RentalRatePerDay=250f;
 }
 
 public void midSizeCar()
 {
  carName="midSizeCar";
  RentalRatePerDay=160f;
 }
 
 public void luxuryCar()
 {
  carName="luxuryCar";
  RentalRatePerDay=300f;
 }
 
 public void passengerVan()
 {
  carName="passengerVan";
  RentalRatePerDay=120f;
 }
 
 public boolean longParking()
 {
  if (DaysOfRental>6)
  {
   return true;
  }
  else
  {
   return false;
  }
    
 }
 
 public void economyCar(float rate)
 {
  carName="economyCar";
  RentalRatePerDay=rate;
 }
 
 public void compactCar(float rate)
 {
  carName="compactCar";
  RentalRatePerDay=rate;
 }
 
 public void miniCar(float rate)
 {
  carName="miniCar";
  RentalRatePerDay=rate;
 }
 
 public void standardCar(float rate)
 {
  carName="standardCar";
  RentalRatePerDay=rate;
 }
 
 public void fullSizeCar(float rate)
 {
  carName="fullSizeCar";
  RentalRatePerDay=rate;
 }
 
 public void midSizeCar(float rate)
 {
  carName="midSizeCar";
  RentalRatePerDay=rate;
 }
 
 public void luxuryCar(float rate)
 {
  carName="luxuryCar";
  RentalRatePerDay=rate;
 }
 
 public void passengerVan(float rate)
 {
  carName="passengerVan";
  RentalRatePerDay=rate;
 }
 
}

Carpark.java

import java.io.*;
public class Carpark extends Main_Rental
{
 int[] season_rental=new int[35];
  public void newRentalInformation() throws IOException
 {
  BufferedReader newInfo=new BufferedReader(new InputStreamReader(System.in));
  String info=newInfo.readLine();
  info.toLowerCase();
  char x=info.charAt(0);
  
 }
 
 public String searchCarRentalInfo(String car) throws IOException
 {
  BufferedReader search=new BufferedReader(new InputStreamReader(System.in));
  String carSearch=search.readLine();
  return car;
 }
 public float increaseRentingRate(float ratePerDay, Rental rent)
 {
  if (rent.longParking()==true)
  {
   ratePerDay = ratePerDay + (ratePerDay * 0.12f);
  } 
   return ratePerDay;
 }
 public void viewAllRecords(Rental rent2)
 {
   for (int i = 0; i < 35; i++)
  {
   System.out.println("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
   System.out.println("ID\tDays\tRate/Day\tCarType\tTotal");
   System.out.println(rent2.ID[i]);
   System.out.println("\t"+rent2.RentalDays[i]);
   System.out.println("\t"+rent2.RatePerDay[i]);
   System.out.println("\t"+rent2.car[i]);
   System.out.println("\t"+rent2.RentalDays[i]*rent2.RatePerDay[i]);
  }
 }
}

Main_Rental.java

import java.io.*;
public class Main_Rental
{
	int count, count2;
	Rental rental = new Rental();
	Carpark run = new Carpark();
	public void main(String args[]) throws IOException
	{
		mainMenu();
	}
	public void mainMenu() throws IOException
	{
		char choice;
		BufferedReader input2=new BufferedReader(new InputStreamReader(System.in));
		System.out.println("\t**||||-----------------------------------------------||||**");
		System.out.println("\t**||||-------C A R   R E N T A L   S Y S T E M-------||||**");
		System.out.println("\t**||||-----------------------------------------------||||**");
		System.out.println("\t\t   [A] - Add rental information");
		System.out.println("\t\t   [V] - View all rental information");
		System.out.println("\t\t   [S] - Search for rental information");
		System.out.println("\t\t   [E] - Exit rental system");
		System.out.println();
		System.out.println();
		System.out.println();
		System.out.print("Select option: ");
		String in=input2.readLine();
		in.toLowerCase();
		choice=in.charAt(0);
		switch (choice)
		{
			case 'a':
		{
		BufferedReader addLine=new BufferedReader(new InputStreamReader(System.in));
		System.out.print("\nEnter line number (0-34): ");
		count=Integer.parseInt(addLine.readLine());
		BufferedReader addID=new BufferedReader(new InputStreamReader(System.in));
		System.out.print("\nEnter customer's ID: ");
		rental.ID[count]=addID.readLine();
		BufferedReader addCategory=new BufferedReader(new InputStreamReader(System.in));
		System.out.print("\nChoose a car Category: ");
		System.out.print("\n[1] Economy car");
	 	System.out.print("\n[2] Compact car");
	 	System.out.print("\n[3] Mini car");
	 	System.out.print("\n[4] Standard car");
	 	System.out.print("\n[5] Full-size car");
	 	System.out.print("\n[6] Mid-size car");
	 	System.out.print("\n[7] Luxury car");
	 	System.out.print("\n[8] Passenger van");
	 	int select=Integer.parseInt(addCategory.readLine());
 		switch (select)
 		{
  			case 1:
   			{
    			rental.economyCar();
    			break;
   			}
   			case 2:
   			{
    			rental.compactCar();
    			break;
   			}
   			case 3:
   			{
    			rental.miniCar();
    			break;
   			}
   			case 4:
   			{
    			rental.standardCar();
    			break;
   			}
	   		case 5:
   			{
    			rental.fullSizeCar();
	    		break;
   			}
   			case 6:
	   		{
    			rental.midSizeCar();
    			break;
   			}
	   		case 7:
	   		{
    			rental.luxuryCar();
    			break;
  	 		}
  	 		case 8:
   			{
    			rental.passengerVan();
    			break;
   			}
   			default:
   			{
   				System.out.println("Error");
   				break;
   			}
		}
  
  		BufferedReader addDays=new BufferedReader(new InputStreamReader(System.in));
  		System.out.print("\nEnter number of days to be rented: ");
  		rental.RentalDays[count]=Integer.parseInt(addDays.readLine());
		rental.longParking();
		run.increaseRentingRate(rental.RatePerDay[count], rental);
		mainMenu();
		}
			case 'v':
			{
				System.out.print("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
				System.out.println("#\tID\tDays\tRate/Day\tCarType\tTotal");
				while (count < 35)
				{
					System.out.print("\n"+count);
					System.out.print("\t"+rental.ID[count]);
					System.out.print("\t"+rental.RentalDays[count]);
					System.out.print("\t"+rental.RatePerDay[count]);
					System.out.print("\t"+rental.car[count]);
					System.out.print("\t"+rental.RentalDays[count]*rental.RatePerDay[count]);
				}
				mainMenu();
			}
			case 's':
			{
				BufferedReader searchMan=new BufferedReader(new InputStreamReader(System.in));
		System.out.print("\nWhat line number are you looking for: ");
		count2=Integer.parseInt(searchMan.readLine());
		if (count2 == count)
		{
					System.out.print("\n"+count);
					System.out.print("\t"+rental.ID[count]);
					System.out.print("\t"+rental.RentalDays[count]);
					System.out.print("\t"+rental.RatePerDay[count]);
					System.out.print("\t"+rental.car[count]);
					System.out.print("\t"+rental.RentalDays[count]*rental.RatePerDay[count]);
		}
		else
		{
			System.out.println("Not found\n");
		}
				mainMenu();
			}
			case 'e':
			{
				break;
			}
			default:
			{
				System.out.println("\nSystem error");
				mainMenu();
			}
		}
	}
}

Whenever I'm trying to compile my program, it reads:

Main_Rental.java, line 5: Rental(java.lang.String,java.lang.String,int) in Rental cannot be applied to ()

Rental rental = new Rental();

(1 error)

What's the meaning of this? How can it be solved?

[xcallmejudasx]

Rental(java.lang.String,java.lang.String,int) in Rental cannot be applied to ()

That error means your trying to create a new rental object without any parameters when the constructor requires a (String, String, int)

[kevzspeare]

In this case, what are the parameters?

[xcallmejudasx]

the parameters are what you need in the constructor. in the case of new Rental() you need new Rental(id,category,days)

[kevzspeare]

okay.

Rental rental = new Rental(String id,String category,int days);

but there's still an error. what would i do?

[xcallmejudasx]

remove the descriptors in front of the variables. send it how I had it. Those variables should be pre-defined and when are sent to the constructor the constructor knows how to cast them.

[xcallmejudasx]

nevermind I see your problem. You can't have Rental rental = new Rental() where you have it. If you need it just defined then do Rental rental;

Once you get all your values you then create a new Rental by calling rental = new Rental(id, category, days);

[kevzspeare]

okay thanks. but i have another problem. i know main's supposed to be a static function, but when i try to run my program (public void main), there's an exception in "main" thread. what would i do?

[Fubarable]

tell us more about this exception: show us the exception in its entirety and let us know which line on of your main causes it to occur.

[kevzspeare]

normally this exception occurs if i have an error in the java. good thing i tweaked everything to make it work.