Thread: how to use Scanner and useDelimiter with int

my first post in this forum hope i do everything right …
I have this code but i get error because i think of the " ; " separator in the file.

so my code is

import java.io.*;
import java.util.*;
 
public class metoder {
	private int id, km, min, totalt;
 
	Scanner sc;
 
	public void lasFil() throws IOException{
		sc = new Scanner (new File("resor.txt"));
		 sc.useDelimiter(";");
 
		while (sc.hasNext()){
 
			id = sc.nextInt();
			km = sc.nextInt();
			min = sc.nextInt();
 
			if (km >20 & min <= 60 ){
				System.out.println("ID:"+id+" "+km+"Km  " + min +"Min: ");
				}
			}
	}
 
 
 
}

how do let java know that the ";" is the separator for each int ? the FIle looks like this ,

1;53;38
2;28;27
3;39;72
4;12;30
5;21;35
6;19;32

Originally Posted by Norm

Please copy the full text of the error message and post it here so we can see what the problem is.

This is the error code i get .
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:840)
at java.util.Scanner.next(Scanner.java:1461)
at java.util.Scanner.nextInt(Scanner.java:2091)
at java.util.Scanner.nextInt(Scanner.java:2050)
at metoder.lasFil(metoder.java:17)
at huvudapp.main(huvudapp.java:7)

--- Update ---

the program scans a text file and gives it names
Ex
1;53;38 > gets ID : 1 KM:53 Min:38

Originally Posted by KevinWorkman

Did you read the API for the Scanner class? The nextInt() method doesn't scan past the next line character.

If you don't understand what I mean by that, I recommend stepping through this with a debugger, or at least adding some print statements, until you understand exactly what the program is doing. How far does it get into the text file? What does it succeed in scanning in? Exactly where in the file does it fail?

ok! i read it , and like i said i'm not very good at java . so what is an debugger ? it seams that it finds the file but doesn't read it because the ; symbol .

Screen Shot 2013-08-27 at 9.28.47 PM.jpg
here is the lines , sorry did't think about the line numbers

so after couples of days and reading on internet i found a working solution i want share
happy programming

import java.io.*;
import java.util.*;
 
public class huvudapp {
 
	private String strID, strKM , strMIN ;
	private int i;
 
	public void lasFil()throws IOException{
		Scanner sc = new Scanner (new File ("resor.txt")); //opens file named resor.txt
		while (sc.hasNextLine()){ // the while is reading the file
			String line = sc.nextLine(); // every line sends to "line" so we can split it 
			String [] arr = line.split(";"); //creats an array and says ";" when you see the symbol split the text
 
			strID = arr[0]; // the diffrent values in the file get there names 
			int id = Integer.parseInt(strID);// string turns to INT for the IF statment 
			strKM = arr[1];
			int km = Integer.parseInt(strKM);
			strMIN = arr[2] ;
			int min = Integer.parseInt(strMIN);
 
			if (km>20 & min<60){
				System.out.print("ID:"+id+" MIN:"+min+" KM:"+km +"\n"); // prints out the values that made the if statment 
				i++; // just to count how many persons there was. 
			}
 
		}System.out.println(i+" persons that made the if statment");
}
	public static void main(String[] args) throws IOException { 
 
		huvudapp mt = new huvudapp (); 
		mt.lasFil(); // calls the class ?? or object ? don't really know the definition
 
	}
 
}

Prints

ID:1 MIN:38 KM:53
ID:2 MIN:27 KM:28
ID:5 MIN:35 KM:21
3 persons that made the if statment