| Eric the Red |
Apr 3rd, 2006 4:32 PM |
changing size of an array
I'm new to java and I’m trying to change the dimension of an array. So I basically use this " String inputStringFinal [] = new String [intNumberofLines + 1];" (blue writing) command every time I want to change the size of the array. the yellow writing is just there to provide a default value if it hasn't been declared already. I know the blue writing deletes everything in the array but that's what I want. If you look at the orange writing it gives a declaration error. Apparently the array has been declared twice (orange and blue writing).
My question is: how am I going to resize the array on the bottom (blue writing) if it needs to be declared on the top in consequence, resetting the array.
:
// The "License" class.
import java.awt.*;
import hsa.Console;
import java.util.Random;
import java.io.*;
public class License
{
static Console c; // The output console
public static void main (String [] args) throws IOException
{
c = new Console ();
boolean blnMusic = false; // use for controlling the music
boolean blnQuit = false; // used to control the while loop during the program.
boolean blnWriteFile = true;
int intNumberofLines = 0;
boolean blnStringDeclared = false;
while (blnQuit == false)
{
blnWriteFile = true; // back to default
/// the menu which i'd like to change to actual GUI later
c.println ("Welcome. What would you like to do?");
c.println ("1. View all of the license plates");
c.println ("2. Randomize and register a license plate");
c.println ("3. Create and register a Custom licence plate.");
c.println ("4. Change a license plates standard expiry date.");
if (blnMusic == false)
{
c.println ("5. Begin music");
}
else
{
c.println ("5. Stop Music");
}
c.println ("6. Quit");
int inputAns = c.readInt ();
String tempLicense = new String (""); // the temp license from each iteration
// end of menu
if (inputAns == 1)
{
c.print ("the list is as Follows");
if (blnStringDeclared == false)
{
String inputStringFinal [] = new String [1]; // just so that we have a default array.
blnStringDeclared = true;
}
for (int arraysize = 0 ; arraysize < intNumberofLines + 1 ; arraysize++)
{
c.println ("Licence plates:");
c.println ("#" + arraysize + 1 + " is: " + inputStringFinal [arraysize]);
}
}
if (inputAns == 2)
{
int tempinttoString [] = new int [4]; // used to hold the string before it converts to a string
Random x = new Random (); // instantiates x a from the random class
// filling the array with int values; (later to be converted to ascii char)
c.println ("go");
for (int i = 0 ; i < 4 ; i++)
{
tempinttoString [i] = x.nextInt (26) + 65; //
if (tempinttoString [i] > 91 || tempinttoString [i] < 65)
{
//error = true;
c.println ("tempstring:" + tempinttoString [i]);
}
}
//}
c.print ("done");
String strLicense = new String ("");
// here we add all the letters that we are working with
for (int m = 0 ; m < 4 ; m++)
{
String aChar = new Character ((char) tempinttoString [m]).toString ();
strLicense = strLicense + aChar;
}
// c.println ("the entire 3 letters are:" + strLicense);
// c.println ("rover out");
strLicense = strLicense + " "; // the space before integers are applied.
int rand = 1;
for (int intcount = 0 ; intcount < 3 ; intcount++)
{
rand = x.nextInt (9) + 0;
strLicense = strLicense + rand;
}
tempLicense = strLicense;
c.print ("strLicense is:" + strLicense);
}
else if (inputAns == 3)
{
//c.print ("okay");
int tempLength;
boolean blnValidPlate = false; // so that the default of the plate is not valid.
while (blnValidPlate == false) // runs until valid
{
//c.print ("okay");
c.println ("What is the license plate you would like?");
//c.println ("");
//String tempLicense = new String ("");
tempLicense = c.readLine (); // the user's license plate
tempLength = tempLicense.length (); // takes length and subtracts 1
if (tempLength < 9)
{
c.println ("your license plate is valid.");
c.println ("your plates expiry date is set to 10 minutes.");
c.println ("Feel free to change the default date.");
c.println ("");
blnValidPlate = true; // plate is now valid
}
else
{
c.println ("Your plate is not valid. What are you trying to pull here?");
c.println ("");
}
}
}
else if (inputAns == 6)
{
c.println ("Don't forget about the expiry date on your license plates.");
c.println ("Have a great day");
blnQuit = true;
blnWriteFile = false; // so that data isn't written to that file
}
else
{
blnWriteFile = false; // so that we don't write to the file
}
/// this process is done no matter what at the end of everything
//c.println ("i'm at blnWritefile");
if (blnWriteFile == true)
{
c.println ("i'm at blnWritefile");
BufferedReader input2 = new BufferedReader (new FileReader ("C:\\output.txt"));
//int intNumberofLines = 0; // default 0 because there is always 1 line to read
// first we get all the data so that it isn't written over
intNumberofLines = Integer.valueOf (input2.readLine ()).intValue ();
c.print (intNumberofLines);
String inputString [] = new String [intNumberofLines]; // array large enough to hold all text data
for (int y = 0 ; y < (intNumberofLines) ; y++) // +1 because we've already read the int for line 1.
{
inputString [y] = input2.readLine (); // because array starts at 0 not 1.
c.print ("String is: " + inputString [y]);
}
String inputStringFinal [] = new String [intNumberofLines + 1]; // +1 because the tempLicense is added to the array.
blnStringDeclared = true; // so it can be used when (inputAns = 1)
// cloning array and adding the final License
for (int i = 0 ; i < intNumberofLines ; i++) // cloning the array
{
inputStringFinal [i] = inputString [i];
}
inputStringFinal [intNumberofLines] = tempLicense; // the last boundary is used for the license just created
//File licenseList = new file ("C:\licensePlate.text");
//PrintWriter out = new PrintWriter (new BufferedWriter (new FileWriter ("C:\\output.txt")));
//out.print (tempLicense);
//out.close ();
}
}
// Place your program here. 'c' is the output console
} // main method
} // License class
|
