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updating vectors using Strings/Int

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JUn

Posts: 1
Nickname: gujunaid23
Registered: Jun, 2003

updating vectors using Strings/Int

Posted: Jun 27, 2003 12:27 PM

I have the following code below. The input is from a text file called test.txt.
INPUT:
@0001 Variable1 3.
@0004 variable2 $4.
@0008 Variable3 mmddyy10.
@0015 Variable4 4.

Column1 Value of Current + Column3 Value of Previous gives you the next row's Column1 Value, and this must continue as each value can be updated within the vector.

I need to manipulate the output such that: The value of each subsequent gives you the next.(Looking at the input will make more sense). Each value in the vector is stored in a String. I am able to take the values out of the String, but unable to manipulate to get the next. This source code is able to add a value to the vector, but unable to update it.

import java.lang.*;
import java.io.*;
import java.util.*;

public class footest
{
String objectFile = "object.txt";

Vector lineData = new Vector();

String currVarSize = "";
String inputVarFnd ="";
String varName = "";
String inputVar;
String inputVarSz;
String temp1= "";
int currColSize;
int nextColSize;

boolean Found;

int index;

public footest()
{
readFile();
writeObject();
findAdd();
CalculateCols();
writeFile();
}

public void readFile()
{
System.out.println("");
System.out.println(">> Loading data from file into vector");
try
{
StringTokenizer words;
String line;
String word;

// prepare file for input
BufferedReader objIn =
new BufferedReader(new BufferedReader(new FileReader("test.txt")));

System.out.println("The input is : ");

// prepare to extract words from a line
// process lines until 'null' (no more input)
while ( (line = objIn.readLine()) != null)
{
//tokenizing line
StringTokenizer st = new StringTokenizer(line);

//Initiate size and name of input.
currColSize = (int)Double.parseDouble(st.nextToken().substring(1));
varName = st.nextToken();
currVarSize = st.nextToken();

//Add each value to a vector as a String
String fooValue = Integer.toString(currColSize);
lineData.add(fooValue);
lineData.add(varName);
l ineData.add(currVarSize);

//Conversion to integer values of each Variable Size
int temp;
//If Character
if (currVarSize.startsWith("$"))
{
temp = (int)Double.parseDouble(currVarSize.substring(1));
}
//If DateW (W is any integer)
else if (currVarSize.startsWith("mmddyy"))
{
temp = (int)Double.parseDouble(currVarSize.substring(6));
}
//If Integer
else
{
temp = (int)Double.parseDouble (currVarSize);
}
nextColSize = currColSize + temp;
currColSize = nextColSize;
System.out.println("@" +currColSize +" " +varName +" " +currVarSize);

}
objIn.close();

}

catch (IOException e)
{
System.out.println(">> error while accessing: test.txt");
}
}

public void writeObject()
{
System.out.println("");
System.out.println(">> Writing vector object to file ");
System.out.println(lineData.toString());
try
{
ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream(objectFile));
os.writeObject(lineData);
os.close();
}
catch (IOException e)
{
System.out.println(">> Error while accessing test.txt");
}
}

public void findAdd()
{
System.out.println("Current Vector size " +lineData.size());
System.out.println("Input Variable Name to find :");
System.out.println("");
String DfltSize = "0";
try
{
BufferedReader stdIn = new BufferedReader(new InputStreamReader(System.in));
inputVarFnd = stdIn.readLine();
if(lineData.contains(inputVarFnd))
{
Found = true;
index = lineData.indexOf(inputVarFnd);
System.out.println("Input located at: " +index);
System.out.println("Input Variable name to add :");
System.out.println("");
inputVar = stdIn.readLine();
lineData.add(index+3, inputVar);
System.out.println("Input Variable size to add :");
System.out.println("");
inputVarSz = stdIn.readLine();
lineData.add(index+4, inputVarSz);
lineData.add(index+5, DfltSize);
System.out.println("");
System.out.println("New size : " +lineData.size());
}
else
{
System.out.println("Input Not Found! Please input the correct Variable Name");
Found = false;
findAdd();
}

}
catch (IOException e)
{
System.out.println(">> Error upon entering input. Please try again.");
}
}

public void CalculateCols()
{
//Conversion to integer values of each Variable Size
int temp;
//If Character
if (currVarSize.startsWith("$"))
{
temp = (int)Double.parseDouble(currVarSize.substring(1));
}
//If DateW (W is any integer)
else if (currVarSize.startsWith("mmddyy"))
{
temp = (int)Double.parseDouble(currVarSize.substring(6));
}
//If Integer
else
{
temp = (int)Double.parseDouble (currVarSize);
}
System.out.println("@" +currColSize +" " +varName +" " +currVarSize);

// nextColSize = currColSize + temp;
// currColSize = nextColSize;
writeObject();
System.out.println("The next Column size should be : @" +currColSize);
}

public void writeFile()
{
System.out.println("");
System.out.println(">> Writing to File");

try
{
BufferedWriter bw = new BufferedWriter(new FileWriter("data.txt"));
for(int i = 3; i < lineData.size(); i = i+3)
{
bw.write("@" +lineData.elementAt(i) +" " +lineData.elementAt(i+1) +" " +lineData.elementAt(i+2));
bw.newLine();
}
bw.close();
System.out.println("DATA EDITING COMPLETE!!");
}
catch (IOException f)
{
System.out.println(">> Error while accessing "+ "data.txt");
}
}

public static void main(String[] args)
{
footest Junaid = new footest();
}

}

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