So this is my code. I'm writing a much larger program for a classwork assignment. I've only posted a snippet and I'm not looking for new code so nobody has to worry there. I'm trying to figure out why my indexing isn't working. Here's the code:

Again, this is a snippet from a much larger class. My issue is with my spaceIndex = enteredGrades.indexOf(" ")


I execute my code and enter

It prints out

Can anyone help me figure out why my whitespace isn't indexing? If I make it index with single char quotations, I get the same output. Any help would be great. Thank you!

Read the documentation

http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#next()



your problem isn't that the space isn't indexing, your problem is that keyboard.next() will only read until the space since space is the default delimiter. you have four options:
1) do not separate your numbers by spaces
2) keep reading until you get all tokens (nextInt might be better than next)
3) change the delimiter
4) use nextLine() instead of next() -> i think this works, but you can double check

This post was edited by carteblanche on Feb 11 2014 11:08pm

In fact, looking closer, it's not even printing the from the System.out.print statement on the String. I suppose that's where my issue lies. It's not being entered into the designated variable correctly?

Oh wow I didn't know that at all. Thanks so much for the help!

So I had done exactly that before reading your edit, and replaced next() with nextline(). A brand new type of error appeared, so I'll post a little bit more of my code to show you where the new error lies. Again, I don't want anyone to think I'm looking for physical code. The new bug isn't even appearing by the compiler.

The code:


The input:


The output:


It's not even printing the statements after the sections that parse. It's jumping into the next method that it's supposed to after execution.

e/ Yes it is! It's printing, without spaces, 809. So I figured out my issue. It's the enteredGrades.length()-1 that's ruining my output. Thanks for the help!

This post was edited by haeload on Feb 11 2014 11:25pm

it's printing like it's supposed to. i'm not sure what you think the problem is. i think you're confusing yourself because you use print(..) instead of println(..).

if you'd like to make your life easier, i recommend you look at String's split() method. it will do the parsing for you. it looks like your last index is off.

input is



You then print enteredGrades, which it shows.

You then set firstIndex to 0, spaceIndex to enteredGrades.indexOf(" ") which is 2, and lastIndex as spaceIndex + 1 which is 3

You then print firstIndex, spaceIndex, and lastIndex which it shows

You then set programString to enteredGrades.substring(firstIndex, spaceIndex) which is substring(0,2). Which returns a string starting from firstIndex of length spaceIndex - firstIndex, which is 2. Setting programString to "80". You trim whitespace, which there is none, parse it to an int, and then print it. Which it shows.

You then set examString to be enteredGrades.substring(lastIndex, enteredGrades.length()-1) which is substring(3, 4) since enteredGrades.length() is 5. This returns a substring starting from lastIndex of length enteredGrades.length()-1-lastIndex which is 5-1-3 which is 1. Setting examString to "9". Trim it, parse it. print it. Which it shows