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Scanner equivalent JDK 1.2.2

I have written a program assuming I was using JDK 1.5 or higher but it appears the server has JDK 1.2.2 and I cannot update it.

The only real problem is that I am using the Java.util.Scanner which apparently does not exist in the JDK 1.2.2.

Is there any equivalent in JDK 1.2.2 that I can use to read a file line by line? I have posted some of my code so you can see how I am trying to use the scanner. Thanks in advance.

import java.io.*;
import java.util.Scanner;
import java.util.ArrayList; 
public class Main { 
    public static ArrayList transactionList = new ArrayList();
    
    public static void main(String[] args) throws IOException {
        Scanner input = new Scanner(System.in); 
        System.out.println("Enter path to transactions (InputAssocA) file: ");
        String fpath = input.nextLine(); 
        readTransactions(fpath);      
    } 
    public static void readTransactions(String filePath) throws FileNotFoundException{
        File file = new File(filePath);
        Scanner transactions = new Scanner(file.getAbsoluteFile()); 
        transactions.nextLine(); 
        while(transactions.hasNext()){
            int TransactionID = Integer.parseInt(transactions.next());
            int itemCount = Integer.parseInt(transactions.next());
            String transactionData = new String(transactions.next()); 
            Transaction t = new Transaction(TransactionID, itemCount, transactionData);
            transactionList.add(t);
        }
    }
}

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CEHJ

You can use BufferedReader:

    public static void readTransactions(String filePath) throws IOException {
	String buffer = null;
	File file = new File(filePath);
	BufferedReader in = new BufferedReader(new FileReader(file));
	while((buffer = in.readLine()) != null) {
	    int TransactionID = Integer.parseInt(buffer);
	    int itemCount = Integer.parseInt(in.readLine());
	    String transactionData = in.readLine();
	    Transaction t = new Transaction(TransactionID, itemCount, transactionData);
	    transactionList.add(t);
	}
	in.close();
    }

Open in new window

Mick Barry

http://helpdesk.objects.com.au/java/how-do-i-read-a-text-file-line-by-line
http://helpdesk.objects.com.au/java/how-do-i-read-a-text-file-line-by-line-into-a-list

Midwest

ASKER

Thanks. Does readLine() read the entire line or does it work similar to Scanner.next()? I suppose I should have told you what the file looked like that I was reading. It is formatted like below.

TID #items items
1 5 A,B,C,D,E
.....
.....

So, the old code would produce results as shown in my comments for the first line.

int TransactionID = Integer.parseInt(transactions.next()); //TransactionID = 1
int itemCount = Integer.parseInt(transactions.next()); //itemCount = 5
String transactionData = new String(transactions.next()); //transactionData = A,B,C,D,E

Am I just going to have to parse this on my own or is there something else I can use that will produce similar results?

SOLUTION

Mick Barry

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ASKER CERTIFIED SOLUTION

CEHJ

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Mick Barry

Midwest,

Why did you ignore my earlier comment which suggested you use StringTokenizer?
At EE you need to accept *all* comments that help you, and I told you both how to read file line by line (as you asked) and also how to tokenize your string.

Midwest

ASKER

CEHJ provided a specific solution to my specific problem. Also, I didn't check back until after CEHJ had posted again, which obviously was a better solution.

Mick Barry

Yes, but I originally suggested it and you should have at least split the points. Thats how EE works as explained in the guidelines.

Midwest

ASKER

Can I still split points? Sorry, I am new to EE and thought I was just supposed to accept the best answer.

Mick Barry

you can, will get someone to reopen it for you and show you how.

Midwest

ASKER

Thanks so much.