How to read doubles from a .txt file

Question

I'm able to read the string variables, but it won't read the double for some reason. What can I do to make it read the double?

public class RundraiserApp { /** * @param args * */ public static void main(String[] args) { Fundraising[] dList = new Fundraising[10]; String name = null; String address = null; String cityStateZip = null; double donation = 0; int i = 0, ctr = 0; Scanner in; File file = new File("Donations.txt"); try { in = new Scanner(file); while (in.hasNext() && i < dList.length) { name = in.nextLine(); address = in.nextLine(); cityStateZip = in.nextLine(); donation = in.nextDouble(); i++; } ctr++; } catch (FileNotFoundException e1) { e1.printStackTrace(); } } }

Try reading it as String and then convert it to double using Double#parseDouble — Luiggi Mendoza
– Luiggi Mendoza, Commented Mar 28, 2013 at 21:24
Error: Exception in thread "main" java.util.InputMismatchException at java.util.Scanner.throwFor(Unknown Source) at java.util.Scanner.next(Unknown Source) at java.util.Scanner.nextDouble(Unknown Source) at RundraiserApp.main(RundraiserApp.java:51) — user2073662
– user2073662, Commented Mar 28, 2013 at 21:37
@user2073662 If you add your input file structure then it will be easy to help you out. Also dont put errors in comment. You can edit your question and add that there. — Smit
– Smit, Commented Mar 28, 2013 at 21:40

Smit · Accepted Answer · 2013-03-28 21:41:18Z

1

Considering your file structure below

Name Address Zip 2000.50

Change donation like.

donation = Double.parseDouble(in.nextLine());

edited Mar 28, 2013 at 21:41

answered Mar 28, 2013 at 21:31

Smit

4,7151 gold badge27 silver badges28 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Taylor Over a year ago

Double.parseDouble(in.nextLine()); (lower case p in parseDouble)

Smit Over a year ago

@Taylor Thanks typo fixed.

Collectives™ on Stack Overflow

How to read doubles from a .txt file

1 Answer 1

2 Comments

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

2 Comments

Related