Karine Roy

Wow it's been a long day. I read that part of the code at least 40 times and didn't even see that!

Thanks so much! I also used your suggestion and it looks better.

Thanks again for all your help!

Actually I got frustrated and rewrote the code. It makes much more sense now but the tokenizer is not working.
import java.util.Scanner; import java.io.*; import java.util.StringTokenizer; public class Test2 { public static void main(String[] args)throws IOException, Exception { int index = 0; int MAX = 6; String lineContent; String[] line = new String[MAX]; String[] firstName = new String[MAX]; String[] lastName = new String[MAX]; String[] gender = new String[MAX]; String[] age = new String[MAX]; String[] dependents = new String[MAX]; String[] sin = new String[MAX]; StringTokenizer st; File file = new File("directory.data"); BufferedReader br = new BufferedReader(new FileReader(file)); lineContent = br.readLine(); do { System.out.println(lineContent); st = new StringTokenizer(lineContent, ","); firstName[index] = st.nextToken(); System.out.println(firstName[index]); lastName[index] = st.nextToken(); gender[index] = st.nextToken(); gender[index] = st.nextToken(); age[index] = st.nextToken(); dependents[index] = st.nextToken(); sin[index] = st.nextToken(); index++; lineContent = br.readLine(); }while (lineContent != null); for (int a = 1; a < index; a++) { int small = a - 1; for (int b = a; b < index; b++) { if (lastName[b].compareTo(lastName[small]) < 0) { small = b; } String temp1 = lastName[a - 1]; lastName[a - 1] = lastName[small]; lastName[small] = temp1; String temp2 = firstName[a - 1]; firstName[a - 1] = firstName[small]; firstName[small] = temp2; String temp3 = gender[a - 1]; gender[a - 1] = gender [small]; gender[small] = temp3; String temp4 = age[a - 1]; age[a - 1] = age[small]; age[small] = temp4; String temp5 = dependents[a - 1]; dependents[a - 1] = dependents[small]; dependents[small] = temp5; String temp6 = sin[a - 1]; sin[a - 1] = sin[small]; sin[small] = temp6; } } int y = 0; System.out.println("Last Name" + " " + "First Name" + " " + "SIN Number\n"); for (y = 0; y < index; y++) { System.out.println(lastName[y] + " " + firstName[y] + " " + sin[y]); } } }

The file contents are:
John,Doe,M,24,2,343345678,
Peter,Miles,M,34,3,333434344,
Mary,Macintosh,F,45,2,323098543,
Laurie,Dent,F,22,1,3245676543,
Kim,Peter,F,32,4,4098734543,
Karyn,Marts,F,34,0,4567890,

The error I get it:

Welcome to DrJava. Working directory is C:\Users\User\Documents
\Karine\School\Java 1\Assignments\Assignment 8
> java ReadFile
John,Doe,M,24,2,343345678,
John
java.util.NoSuchElementException
at java.util.StringTokenizer.nextToken(Unknown Source)
at ReadFile.main(ReadFile.java:43)

Not too sure where I am going wrong this time. It should work. What I am thinking is that there is something wrong with the file.

sorry, fixed the spacing:

public static void tokenFile(int index, String[] firstName, String[] lastName, String[] gender, int[] age, int[] dependents, int[] sin, String[] line) { for (int x = 0; x < index; x++) { int convAge; int convDep; int convSin; StringTokenizer st = new StringTokenizer(","); String first = StringTokenizer.nextToken(); firstName[x] = first; String last = StringTokenizer.nextToken(); lastName[x] = last; String gend = StringTokenizer.nextToken(); gender[x] = gend; String age2 = StringTokenizer.nextToken(); convAge = Integer.parseInt(age2); age[x] = convAge; String dep = StringTokenizer.nextToken(); convDep = Integer.parseInt(dep); dependents[x] = convDep; String sin2 = StringTokenizer.nextToken(); convSin = Integer.parseInt(sin2); sin[x] = convSin; } }

I've fixed the second problem. As for the first (the repeating error), i added the word "static" in my method but it still gives me the same error. There must be something I am not understanding. Sorry, I am very new at this....

public static void tokenFile(int index, String[] firstName, String[] lastName, String[] gender, int[] age, int[] dependents, int[] sin, String[] line) { for (int x = 0; x < index; x++) { int convAge; int convDep; int convSin; StringTokenizer st = new StringTokenizer(","); String first = StringTokenizer.nextToken(); firstName[x] = first; String last = StringTokenizer.nextToken(); lastName[x] = last; String gend = StringTokenizer.nextToken(); gender[x] = gend; String age2 = StringTokenizer.nextToken(); convAge = Integer.parseInt(age2); age[x] = convAge; String dep = StringTokenizer.nextToken(); convDep = Integer.parseInt(dep); dependents[x] = convDep; String sin2 = StringTokenizer.nextToken(); convSin = Integer.parseInt(sin2); sin[x] = convSin; } }

Ok I see what is wrong with the For statement. I rewrote the code as follow but get these 8 error messages (7 being about a non-static method cannot be referenced from a static context, and the other is with my compareTo, having to be a boolean and not a int)

Here is the code:
import java.util.Scanner; import java.io.*; import java.util.StringTokenizer; public class ReadFile { public static void main(String[] args) { int index = 0; int MAX = 6; String[] line = new String[MAX]; String[] firstName = new String[MAX]; String[] lastName = new String[MAX]; String[] gender = new String[MAX]; int[] age = new int[MAX]; int[] dependents = new int[MAX]; int[] sin = new int[MAX]; displayFileContent(index, line); System.out.println(); tokenFile(index, firstName, lastName, gender, age, dependents, sin, line); reportSorted(index, firstName, lastName, gender, age, dependents, sin); printReport(index, firstName, lastName, gender, age, dependents, sin); } public static String[] displayFileContent(int index, String[] line) { try { FileInputStream fstream = new FileInputStream("directory.data"); DataInputStream in = new DataInputStream(fstream); BufferedReader br = new BufferedReader(new InputStreamReader(in)); String strLine; while ((strLine = br.readLine()) !=null) { System.out.println(strLine); line[index] = strLine; index++; } } catch (Exception e) { System.err.println("Error: " + e.getMessage()); }return line; } public void tokenFile(int index, String[] firstName, String[] lastName, String[] gender, int[] age, int[] dependents, int[] sin, String[] line) { for (int x = 0; x < index; x++) { int convAge; int convDep; int convSin; StringTokenizer st = new StringTokenizer(","); String first = StringTokenizer.nextToken(); firstName[x] = first; String last = StringTokenizer.nextToken(); lastName[x] = last; String gend = StringTokenizer.nextToken(); gender[x] = gend; String age2 = StringTokenizer.nextToken(); convAge = Integer.parseInt(age2); age[x] = convAge; String dep = StringTokenizer.nextToken(); convDep = Integer.parseInt(dep); dependents[x] = convDep; String sin2 = StringTokenizer.nextToken(); convSin = Integer.parseInt(sin2); sin[x] = convSin; } } public static void reportSorted(int index, String[] firstName, String[] lastName, String[] gender, int[] age, int[] dependents, int[] sin) { for (int a = 1; a < index; a++) { int small = a - 1; for (int b = a; b < index; b++) { if (lastName[b].compareTo(lastName[small])) { small = b; } String temp1 = lastName[a - 1]; lastName[a - 1] = lastName[small]; lastName[small] = temp1; String temp2 = firstName[a - 1]; firstName[a - 1] = firstName[small]; firstName[small] = temp2; String temp3 = gender[a - 1]; gender[a - 1] = gender [small]; gender[small] = temp3; int temp4 = age[a - 1]; age[a - 1] = age[small]; age[small] = temp4; int temp5 = dependents[a - 1]; dependents[a - 1] = dependents[small]; dependents[small] = temp5; int temp6 = sin[a - 1]; sin[a - 1] = sin[small]; sin[small] = temp6; } } } public static void printReport(int index, String[] firstName, String[] lastName, String[] gender, int[] age, int[] dependents, int[] sin) { int y = 0; System.out.println("Last Name" + " " + "First Name" + " " + "SIN Number\n"); for (y = 0; y < index; y++) { System.out.println(lastName[y] + " " + firstName[y] + " " + sin[y]); } } }

And here are the error messages.

"8 errors found:

File: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java [line: 25]
Error: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java:25: non-static method tokenFile(int,java.lang.String[],java.lang.String[],java.lang.String[],int[],int[],int[],java.lang.String[]) cannot be referenced from a static context

File: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java [line: 64]
Error: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java:64: non-static method nextToken() cannot be referenced from a static context

File: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java [line: 66]
Error: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java:66: non-static method nextToken() cannot be referenced from a static context

File: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java [line: 68]
Error: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java:68: non-static method nextToken() cannot be referenced from a static context

File: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java [line: 70]
Error: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java:70: non-static method nextToken() cannot be referenced from a static context

File: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java [line: 73]
Error: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java:73: non-static method nextToken() cannot be referenced from a static context

File: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java [line: 76]
Error: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java:76: non-static method nextToken() cannot be referenced from a static context

File: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java [line: 92]
Error: C:\Users\User\Documents\Karine\School\Java 1\Assignments\Assignment 8\ReadFile.java:92: incompatible types
found : int
required: boolean"

Thanks guys, this helped a lot!

The first part of my assignment was to write a file (which I have done) with a matrix of information (First name, last name, gender, age, dependents and SIN/SSN).
import java.io.*; //creates a comma delimited file using ASCII //I/O exceptions are not caught public class Directory { public static void main (String[] arg) throws IOException { File outputFile = new File("Directory.data"); FileOutputStream outputStream = new FileOutputStream(outputFile); PrintWriter dataOutputWriter = new PrintWriter(outputStream); //writes data into Directory dataOutputWriter.println("John,Doe,M,24,2,343345678"); dataOutputWriter.println("Peter,Miles,M,34,3,333434344"); dataOutputWriter.println("Mary,Macintosh,F,45,2,323098543"); dataOutputWriter.println("Laurie,Dent,F,22,1,3245676543"); dataOutputWriter.println("Kim,Peter,F,32,4,4098734543"); dataOutputWriter.println("Karyn,Marts,F,34,0,4567890"); dataOutputWriter.close(); //close the output stream } }

Check to see if the file exist and if it has parent directory names as follow:
import java.util.Scanner; import java.io.*; public class fileCheck { public static void main (String[] args) throws IOException { Scanner keyboard = new Scanner(System.in); System.out.println("Enter the name of the file or directory\n"); String filename = keyboard.nextLine(); File file = new File(filename); if (!file.exists()) { System.out.println("File/Directory not found"); } else { boolean isDirectory = file.isDirectory(); if (isDirectory) { File[] listOfFiles = file.listFiles(); for (int i = 0; i < listOfFiles.length; i++) { System.out.println(listOfFiles[i].getName()); } } else { System.out.println("Is a file"); String parentPath = file.getParent(); System.out.println(parentPath); } } } }

The last part of my assignment is:

Write a program to:

a. Read in the file one line at a time into a string using readLine and display them in DOS window.

b. Using StringTokenizer break up the string into separate fields in arrays as follows: first, last, gender, age, dependents and sin.

c. Print a report in a DOS window that lists all First Names, Last Names and SIN numbers by last name.

I think I got a. right but b. and c. are giving me trouble. Here's what I have so far:
import java.util.Scanner; import java.io.*; import java.util.StringTokenizer; public class ReadFile { public static int index = 0; public static int MAX = 6; public static String[] line = new String[MAX]; public static String[] firstName = new String[MAX]; public static String[] lastName = new String[MAX]; public static String[] gender = new String[MAX]; public static int[] age = new int[MAX]; public static int[] dependents = new int[MAX]; public static int[] sin = new int[MAX]; public static void main(String[] args) { displayFileContent(); tokenFile(); reportSorted(); } public static void displayFileContent() { try { FileInputStream fstream = new FileInputStream("directory.data"); DataInputStream in = new DataInputStream(fstream); BufferedReader br = new BufferedReader(new InputStreamReader(in)); String strLine; while ((strLine = br.readLine()) !=null) { System.out.println(strLine); line[index] = strLine; index++; } } catch (Exception e) { System.err.println("Error: " + e.getMessage()); } } public static void tokenFile() { /* StringTokenizer st = new StringTokenizer(String str, ","); for (int x = 0; x < index; index++) { String first = strTokenizer.nextToken(); firstName[x] = first; String last = strTokenizer.nextToken(); lastName[x] = last; String gender = strTokenizer.nextToken(); gender[x] = gender; String age = strTokenizer.nextToken(); age = Integer.parseInt(age); age[x] = age; String dependents = strTokenizer.nextToken(); dependents = Integer.parseInt(dependents); dependents[x] = dependents; Sting sin = strTokenizer.nextToken(); sin = Integer.parseInt(sin); sin[x] = sin;*/ } //To sort by last name public static void reportSorted() { } }

Any advice as to what I am doing wrong?

Thanks

I am trying to catch an exception when the part number entered is not an integer. For some reason my "try - catch" is not working. Any advice?
try { System.out.println("\nEnter part number"); int part = TextIO.getInt(); itemEntered[index] = part; count++; index++; } catch(NumberFormatException ex) { System.out.println("Please enter a whole number as a part number"); }

Thanks for your help! I figured it out. The .equal() only works on strings, I had integers!

I'm having a problem with finding a match in my 2d array with an answer provided with the user.

I know my code is not complete but I am trying to get menu option #1 to work. Can anyone help me?

Also, I have no idea how to set my code with the numbers on the side, can you let me know how to do this?

import java.util.Scanner; import java.io.*; public class Assignment7 { static int MAX = 25; //Maximum entries static int itemCounter; static int count = 0; static double[] soldTotal = new double[MAX]; static final double[][] parts = {{1, 17.56}, {2, 18.56}, {3, 3.45}, {4, 0.67}}; static double[] itemEntered; public static void main (String[] args) throws IOException { dispMenu(); } public static void dispMenu() { System.out.println("1. Enter item sold and quantity"); System.out.println("2. Display input"); System.out.println("3. Exit"); int answer = TextIO.getInt(); switch (answer) { case 1: input(); dispMenu(); break; case 2: display(); dispMenu(); break; case 3: exit(); break; default: System.out.println("Choice must be 1, 2 or 3"); dispMenu(); System.out.println(); break; } } public static void input() { System.out.println("\nEnter part number"); int part = TextIO.getInt(); itemEntered[count] = part; count ++; partCheck(itemEntered); } public static void partCheck(double[] itemEntered) { try { if (itemCounter > MAX) { System.out.println("\nYou have reach the maximum entries\n"); } else { boolean found = false; int row = 0; while (!found && row < parts.length && count > 0) { if(itemEntered[count].equals(parts[row])) { found = true; } else { row ++; } if (!found) { System.out.println("\nPart number not found\n"); dispMenu(); } } } }catch (Exception e) { System.out.println("An exception has occured"); } } public static void display() { } public static void exit() { } }

That was simple. Thank you so much! I will use the code tag next time.

I am new at Java and I am not sure if I am posting at the right place. Please let me know if I am not. I am trying to transfer a 2 dimension array to a text file but get the following runtime error:

java.lang.ArrayIndexOutOfBoundsException: 2
at Parts.writeArray(Parts.java:25)
at Parts.main(Parts.java:13)

Here is the code I have so far:

import java.util.Scanner;
import java.io.*;

public class Parts
{

static final String [][] parts = {{"1", "17.56"}, {"2", "18.56"}, {"3", "3.45"}, {"4", "0.67"}};

public static void main (String[] args) throws IOException
{

PrintWriter outputFile = new PrintWriter("Parts.txt");
writeArray(parts, "Parts.txt");}

public static void writeArray(String[][] parts, String outputFile)
{
PrintStream array;
try
{
array = new PrintStream(new FileOutputStream("Parts.txt"));
for (int row = 0; row < parts.length; row++)
{
for (int col = 0; col < parts.length; col++)
{
String s = parts[row][col];
array.println(s);
}
}
array.close();
}catch (FileNotFoundException e)
{
System.out.println("not found");}
}

}

Can someone please help me?

Thanks!

I am new at Java and I am not sure if I am posting at the right place. Please let me know if I am not. I am trying to transfer a 2 dimension array to a text file but get the following runtime error:

java.lang.ArrayIndexOutOfBoundsException: 2
at Parts.writeArray(Parts.java:25)
at Parts.main(Parts.java:13)

Here is the code I have so far:

import java.util.Scanner; import java.io.*; public class Parts { static final String [][] parts = {{"1", "17.56"}, {"2", "18.56"}, {"3", "3.45"}, {"4", "0.67"}}; public static void main (String[] args) throws IOException { PrintWriter outputFile = new PrintWriter("Parts.txt"); writeArray(parts, "Parts.txt");} public static void writeArray(String[][] parts, String outputFile) { PrintStream array; try { array = new PrintStream(new FileOutputStream("Parts.txt")); for (int row = 0; row < parts.length; row++) { for (int col = 0; col < parts.length; col++) { String s = parts[row][col]; array.println(s); } } array.close(); }catch (FileNotFoundException e) { System.out.println("not found");} } }

Can someone please help me?

Thanks!