Hi im trying to get a part of my java code to write to a text file. Ive tried every thing and for the life of me I cant get it to compile. Could some one help me plz?
//import librays
import java.io.*;
import java.util.*;
class prof2
{
publicstaticint genNumber()
{
//make me a random number generator called 'generator'
Random generator = new Random();
return generator.nextInt(9)+1;
}
publicstaticvoid customer()
{
//Declaire Variables
String surname, address; //customers surname and address
char initial, answer = 'y';; //customers initial
int account1, account2, account3, account4, account5; //5 independant numbers
System.out.println("**************************************************\n***** Create a New Customer Account *****\n**************************************************\n");
System.out.println("Please enter Surname:\n");
surname = EasyIn.getString();
System.out.println("\nPlease enter customers initial:\n");
initial = EasyIn.getChar();
System.out.println("Please enter the customers address:\n");
address = EasyIn.getString();
//generate first number
account1 = genNumber();
//generate second number
do
{
account2 = genNumber();
//carry on all the time this generates a duplicate number
}
while (account2 == account1);
//generate third number
do
{
account3 = genNumber();
//carry on all the time this generates a duplicate number
}
while (account3 == account1 | account3 == account2);
//generate fourth number
do
{
account4 = genNumber();
//carry on all the time this generates a duplicate number
}
while (account4 == account1 | account4 == account2 | account4 == account3);
//generate fifth number
do
{
account5 = genNumber();
//carry on all the time this generates a duplicate number
}
while (account5 == account1 | account5 == account2 | account5 == account3 | account5 == account4);
//output the resulting numbers
System.out.println("\nThe new account number is:" + account1 + ""+ account2 + ""+ account3 + ""+ account4 + ""+ account5);
//Output new account details
System.out.println("New account details:\n");
System.out.println( "Account Name: "+surname+ " "+initial+ "\nAccount address: " +address+ "\nAccount number: " + account1 + ""+ account2 + ""+ account3 + ""+ account4 + ""+ account5);
}
/*-------------------------------------------------------------------------------------------------
HireCar Method:
Created and Designed by Neil Wilkie.
This method is designed to allow a customer to hire a car by searching the following: Model, Engine Size or Age
**/
publicstaticvoid hireCar()
{
//decalre variables
char repeatChar, rightFile;
byte choice, repeatByte;
String search1, search3;
double search2;
//Create String array of owned cars
String[] OwnedCar;
OwnedCar = new String [10];
OwnedCar [0] = ("Vauxhall, Corsa, 1.3, GP 03 CBT, 8,123, 35, Y");
OwnedCar [1] = ("Vauxhall, Agila, 1.2, AB 03 FTR, 10,045, 38, S");
OwnedCar [2] = ("Vauxhall, Agila, 1.0, FT 01 YUT, 21,488, 40, N");
OwnedCar [3] = ("Vauxhall, Astra, 1.6, RT 51 DRE, 15,032, 32, S");
OwnedCar [4] = ("Vauxhall, Astra, 2.2, DR 51 KLP, 19,933, 25, Y");
OwnedCar [5] = ("Ford, Fiesta, 1.0, GP 53 REW, 4,987, 40, Y");
OwnedCar [6] = ("Ford, Fiesta, 1.3, SR 01 BHG, 19,997, 35, N");
OwnedCar [7] = ("Ford, Mondeo, 1.6, WE 02 GTY, 17,342, 33, N");
OwnedCar [8] = ("Ford, Mondeo, 2.0, QW 52 EWQ, 12,345, 25, Y");
OwnedCar [9] = ("Ford, Orion, 1.8, SD 01 TYR, 24, 459, 28, N");
//Ask user what they would like to do
System.out.println("Welcome to the Hire a car section of Cars R Us. What would you like to do?\n");
//Start the loop for this section
do
{
System.out.println("1)Search for a car by model?\n\n2)Search for a car by engine size?\n\n3)Search for car by age?\n");
choice = EasyIn.getByte();
//option 1 model search selected
if (choice == 1)
{
System.out.println("\nPlease enter the model of the car you are looking for:\n");
search1 = EasyIn.getString();
}
//option 2 engine size search selected
if (choice == 2)
{
System.out.println("\nPlease enter the engine size of the car you are looking for:\n");
search2 = EasyIn.getDouble();
}
//option 3 age search selected
if (choice == 3)
{
System.out.println("\nPlease enter the age of the car you are looking for:\n");
search3 = EasyIn.getString();
}
do
{
//Read in whether to repeat program or not
System.out.print("\nWould you like to carry out a search again? (y or n): ");
repeatChar = EasyIn.getChar();
switch (repeatChar)
{
case 'Y':
case 'y': repeatByte = 1; break;
case 'N':
case 'n': repeatByte = 2; break;
default: repeatByte = 0;
System.out.println("Invalid input. You must enter either a 'y' or a 'n' (this is not case sensitive)\n"); break;
}
}
while ((repeatByte <1 || (repeatByte >2))); //invalid character entered
}
while (repeatByte != 2); //character not 'n' or 'N'
}
/*---------------------------------------------------------------------------------------------
BuyCar Method:
This method allows the user to buy a car
**/
publicstaticvoid buyCar()
{
System.out.println("Nope Doesnt work either!");
}
/*---------------------------------------------------------------------------------------------
Return CarMethod:
Created and Designed by Stuart Coates.
This method is designed to allow customers to return a car
**/
publicstaticvoid returnCar()
{
//declare variables
finalbyte costPerDay = 30;
finalfloat costPerMile = 0.55f;
finalbyte mpg = 26;
finalfloat costOfFuel = 3.5f;
int daysHired;
int milesDone;
float totalCost;
byte customerType;
int accountNumber;
System.out.println("**************************************************\n***** Return a Car *****\n**************************************************\n");
System.out.println("Preparing the bill\n");
//read in the number of days car hired for
System.out.print("How many days has the customer had the car: ");
daysHired = EasyIn.getInt();
//read in the mileage done
System.out.print("\nHow many miles has the car done during the hire period: ");
milesDone = EasyIn.getInt();
//calculate cost of hire - cost consists of 3 things: daily hire charge, mileage charge and cost of fuel used
totalCost = (costPerDay * daysHired) + (costPerMile * milesDone) + (costOfFuel * milesDone/mpg);
//Ask if the customer is a one off customer or a returning customer
System.out.println("\nIs the customer a returning customer?\n1)Yes\n2)No\n");
customerType = EasyIn.getByte();
if (customerType ==1)
System.out.println("Please Enter the customers Account number:");
accountNumber = EasyIn.getInt();
System.out.println("\nacc" +accountNumber+" Thank you. The account has been up dated");
{
String s = "";
FileOutputStream account; // declare a file output object
PrintStream printstream; // declare a print stream object
try
{
// Create a new customer stream
account = new FileOutputStream("acc"+accountNumber+".txt");
// Connect print stream to the output stream
s = ("account");
printstream = new PrintStream( account );
printstream.println (s + " " + "Cars R Us Account Details");
printstream.println ("\nAccount Number:"+accountNumber+);
printstream.println ("\nThe total amount payable is:"+totalCost+);
printstream.println ("\nThis bill covers a total of "+daysHired+ "hired");
printstream.println ("\nWith a total milage of" +milesDone+" travelled");
printstream.close();
}
catch (Exception e)
{
System.err.println ("Error writing to file");
}
if (customerType ==2)
System.out.println("\nCost of hire: " + totalCost);
}
}
/*---------------------------------------------------------------------------------------------
The main method
**/
publicstaticvoid main (String[]args)
{
{//decalare variables
byte choice;
char repeatChar;
//Print out the options for the user
System.out.println("**************************************************\n***** Welcome to Cars R Us Car Hire system *****\n**************************************************");
System.out.println("\nFrom the list below please select your required function:");
System.out.println("\n1)Hire a car;\n2)Return a car;\n3)Buy a car;\n4)Create a customer;\n\n");
//caoture the users selection from the keyboard
choice = EasyIn.getByte();
/*
This method "hireCar" was created and designed by Neil Wilkie"
**/
if(choice == 1)
hireCar();
elseif (choice == 2)
returnCar();
elseif (choice == 3)
buyCar();
/*
The following "customer" method was created by Kieran Marshel.
**/
elseif (choice == 4)
customer();
else
System.out.println("Incorrect Selection!");
}
}
}
// EasyIn.java
import java.io.*;
publicabstractclass EasyIn
{
static String s = new String();
staticbyte[] b = newbyte[512];
staticint bytesRead = 0;
publicstatic String getString()
{
boolean ok = false;
while(!ok)
{
try
{
bytesRead = System.in.read(b);
s = new String(b,0,bytesRead-1);
s=s.trim();
ok = true;
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
return s;
}
publicstaticint getInt()
{
int i = 0;
boolean ok = false;
while(!ok)
{
try
{
bytesRead = System.in.read(b);
s = new String(b,0,bytesRead-1);
i = Integer.parseInt(s.trim());
ok = true;
}
catch(NumberFormatException e)
{
System.out.println("Make sure you enter an integer");
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
return i;
}
publicstaticbyte getByte()
{
byte i = 0;
boolean ok = false;
while(!ok)
{
try
{
bytesRead = System.in.read(b);
s = new String(b,0,bytesRead-1);
i = Byte.parseByte(s.trim());
ok = true;
}
catch(NumberFormatException e)
{
System.out.println("Make sure you enter a byte");
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
return i;
}
publicstaticshort getShort()
{
short i = 0;
boolean ok = false;
while(!ok)
{
try
{
bytesRead = System.in.read(b);
s = new String(b,0,bytesRead-1);
i = Short.parseShort(s.trim());
ok = true;
}
catch(NumberFormatException e)
{
System.out.println("Make sure you enter a short integer");
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
return i;
}
publicstaticlong getLong()
{
long l = 0;
boolean ok = false;
while(!ok)
{
try
{
bytesRead = System.in.read(b);
s = new String(b,0,bytesRead-1);
l = Long.parseLong(s.trim());
ok = true;
}
catch(NumberFormatException e)
{
System.out.println("Make surre you enter a long integer");
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
return l;
}
publicstaticdouble getDouble()
{
double d = 0;
boolean ok = false;
while(!ok)
{
try
{
bytesRead = System.in.read(b);
s = new String(b,0,bytesRead-1);
d = (Double.valueOf(s.trim())).doubleValue();
ok = true;
}
catch(NumberFormatException e)
{
System.out.println("Make sure you enter a decimal number");
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
return d;
}
publicstaticfloat getFloat()
{
float f = 0;
boolean ok = false;
while(!ok)
{
try
{
bytesRead = System.in.read(b);
s = new String(b,0,bytesRead-1);
f = (Float.valueOf(s.trim())).floatValue();
ok = true;
}
catch(NumberFormatException e)
{
System.out.println("Make sure you enter a decimal number");
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
return f;
}
publicstaticchar getChar()
{
char c = ' ';
boolean ok = false;
while(!ok)
{
try
{
bytesRead = System.in.read(b);
s = new String(b,0,bytesRead-1);
if(s.trim().length()!=1)
{
System.out.println("Make sure you enter a single character");
}
else
{
c = s.trim().charAt(0);
ok = true;
}
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
return c;
}
publicstaticvoid pause()
{
boolean ok = false;
while(!ok)
{
try
{
System.in.read(b);
ok = true;
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
}
publicstaticvoid pause(String messageIn)
{
boolean ok = false;
while(!ok)
{
try
{
System.out.print(messageIn);
System.in.read(b);
ok = true;
}
catch(IOException e)
{
System.out.println(e.getMessage());
}
}
}
}
Any help and little improvements would be great. Can some one explain to me how I search an array full of strings? I cant work it out for the life of me. Any help will be great thank you
To get your program to compile I had to make the following corrections:
printstream.println (s + " " + "Cars R Us Account Details");
//printstream.println ("\nAccount Number:"+accountNumber+);
printstream.println ("\nAccount Number:"+accountNumber);
//printstream.println ("\nThe total amount payable is:"+totalCost+);
generally when a file writer is not saving a file with the updated contents, it means the file writer stream was not closed due to an oversight in the code.
Class names normally have the first letter capitalized: prof2 would normally be named Prof2
It is not a requirent.
The whole idea of object oriented programming is so you can replace the geekish String arrays you have: String[] OwnedCar; OwnedCar = new String [10];
with a class that acts as a data holder and the fields can be given names that human readable so you can read the code and understand it. You make your data holders private and use get and set public methods.
Previous Topic
