CODEWITHSUNDEEP
javajava.util.scannerreadfile
wade aston
wade aston

Reputation: 105

Reading in text file with java (with Tabs)

I keep getting this error. I wasn't sure if the reason was because of the tabs that are contained within the text document. But I can't figure it out!

input file:

 Baker, William,        Chavez,     04/01/05,   04/10/06
    Sanchez, Jose,      Chavez,     06/15/05,
    Anderson, Robert,   Wong,       04/02/05,   03/30/06

Here is my error:

  Exception in thread "main" java.util.NoSuchElementException
    at java.util.Scanner.throwFor(Scanner.java:907)
    at java.util.Scanner.next(Scanner.java:1416)
    at readFile.readFile(readFile.java:26)
    at Tree.main(Tree.java:64)

Here is my code for my readFile class! Can't figure it out 

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


public class readFile {
private Scanner x;


public void openFile(){
    try{
    x = new Scanner(new File("patient.txt"));
    }
    catch (Exception e){
        System.out.println("Couldn't find file!");
    }

}

public void readFile(){

    Tree tree = new Tree();
    {
        int key=0;
        while(x.hasNext()){
            String patientName = x.next();
            String doctorName = x.next();
            String currentApp = x.next();
            String nextApp = x.next();
            tree.addNode(key++, patientName, doctorName, currentApp, nextApp);
        }
    }




}
public void closeFile(){
    x.close();
}

}

Upvotes: 0

Views: 2899

Answers (1)

Peter Lawrey
Peter Lawrey

Reputation: 533820

My guess is you have a line which more or less than four words. Note. Scanner.next() reads a word so if you have say

one{tab}two three{tab}four{tab}five{newline}

This is five words. Once this happens you won't have an exact multiple of four words and your programs will crash as it does.

I suggest you read a line at a time and split using just the tab character instead.

while (x.hasNextLine()) {
    String line = x.nextLine();
    if (line.trim().isEmpty()) continue; // skip blank lines.

    String[] parts = line.split("\t", 4);

}

Upvotes: 2

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