help! 2 dimensional array problem 1

[KenWan]

I don't know how to enter my values into a 2 dimensional array using for loops then getting it the values for 1 column into a string[] type.

I got as far as setting up 2 arrays

String[][] stringList2 = new String[list2.size()][list2.size()];

but I want to enter a String name in the first column and a string value in the second column. Then using JSP code do something like :

String[] years  = filemanager.getList("Years.List");

to get at the inputs fora drop list.

Main problem put the code into a 2 dim array, then getting it out on either column.
I have read the api for array, vector, enumeration and string but still don't know how to code it or why my code doesn't stand up. Please help.

 

[sedj]

try this :

String one = "one";
String two = "two";

String[][] arr = new String[5][2];

arr[0][0] = one;
arr[0][1] = two;

one = "three";
two = "four";

arr[1][0] = one;
arr[1][1] = two;

... and so on

 

[KenWan]

hmm i think I can work with that...

 

[KenWan]

im getting something out, but how do I get one column of String out?

 

[KenWan]

is my code right?

public String[][] simpleFileReader(String filename)
  throws FileNotFoundException, IOException {
				
  BufferedReader inFile = new BufferedReader(
	new FileReader(pathSettings + filename) );

	Vector list2 = new Vector();
	Vector list3 = new Vector();
	String line2, iKey;
	int iValue =0;
	String iLine;
		
	while (inFile.ready()) {
	  line2 = inFile.readLine();
	  if (line2.length() != 0){
	    int end = line2.indexOf(';'); 
	    if (end < 0) {
	      int left1  = line2.indexOf('[');
	      int right1 = line2.indexOf(']',left1);
	      int left2  = line2.indexOf('[',right1);
	      int right2 = line2.indexOf(']',left2);
	      iLine = line2.substring(left2 + 1,right2);
iKey =  line2.substring(left1 + 1, right1);
	      list2.add(iKey);
	      list3.add(iLine);
	    }
	}
   }
   inFile.close();
   String[][] stringList2 = new String[list2.size()]
[list2.size()];
	int i = 0;
	int k = 0;
	for (Enumeration e = list2.elements();e.hasMoreElements() ; k++)  {
	stringList2[i][k] = (String) e.nextElement();	 
	for (Enumeration f = list3.elements(); f.hasMoreElements() ; i++){
	stringList2[i][k] = (String) f.nextElement();}	 
		}
	 System.err.println(stringList2[i][k]);
	return stringList2;
		
}

 

[KenWan]

well i guess that completly wrong but i did manage to output an object for some reason now im stuck with no idea of how to get the key and value to stay together. Anyway thanks for your help Sedj

 

[sedj]

KenWan, I think you are over-complicating things here ...

Try the code below, I think you'll find it a little simpler :

input file example :

[aaa Key][aaa Value]
[bbb Key] [bbb Value]
[ccc Key][ccc Value]
[ddd Key] [ddd Value]

and the code :

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


public class Test {

	public static void main(String args[]) throws IOException {
		String [][] myArr = new Test().parseFile();
	}

	public String[][] parseFile() throws IOException {
		BufferedReader br = new BufferedReader(new FileReader("example.txt"));
		String line = "";
		ArrayList al = new ArrayList();

		// Loop the file
		while ((line = br.readLine()) != null) {
			System.err.println("Parsing line : " +line);
			StringTokenizer st = new StringTokenizer(line, "[]");

			String keyValue = "";
			// Not using SDK 1.4, need to use StringTokenizers to get rid of spaces
			while (st.hasMoreTokens()) {
				String part = st.nextToken();
				if (part.trim().length() != 0) {
					keyValue += part +"|";
				}
			}

			al.add(keyValue);

		}

		// And finally create out 2 dimensional array ...

		String[][] arr = new String[al.size()][2];
		for (int i = 0; i < al.size(); i++) {
			// Now break the key Value string into separate key and value
			StringTokenizer st = new StringTokenizer((String)al.get(i), "|");

			String key = st.nextToken();
			String value = st.nextToken();
			System.err.println("Getting : key(" +key +"),  value(" +value +")");

			arr[i][0] = key;
			arr[i][1] = value;
		}

		return arr;
	}

}

 

[KenWan]

Whoo hoo I got it to store properly here's the code in the end.

  public String[][] simpleFileReader(String filename)
			throws FileNotFoundException, IOException {
				
		BufferedReader inFile = new BufferedReader(
									new FileReader(pathSettings + filename) );
		ArrayList al = new ArrayList();
		String line2;
		
		while ((line2 = inFile.readLine()) !=null) {
	      if (line2.length() != 0){   //Ignores blank spaces
		    int end = line2.indexOf(';');  //Ignores  ';' comments
			if (end < 0) {
			  System.err.println("Parsing line : " +line2);
			  StringTokenizer st = new StringTokenizer(line2, "[]");
			  String keyValue = "";
			  while (st.hasMoreTokens()) {
				String part = st.nextToken();
				if (part.trim().length() != 0) {
					keyValue += part +"|";
				}
			  }
			al.add(keyValue);
		   	}
		  }
		}
		
		inFile.close();
		
		String[][] stringList2 = new String[al.size()][2];
		
		// and add each item in the array list to the stringList[][]
		for (int i = 0; i < al.size(); i++) {
			
			StringTokenizer st = new StringTokenizer((String)al.get(i), "|");
			String iKey = st.nextToken();
			String iValue = st.nextToken();
			System.err.println("Getting : key(" +iKey +"),  value(" +iValue +")");
			stringList2[i][0] = iKey;
			stringList2[i][1] = iValue;
		}
		// now return the string[][] we have just built
		return stringList2;
	}

hmm you're right Sedj, I did over do it with the complication, sorry.