Indexing Problem with Java Program: ArrayIndexOutOfBounds Exception

[Trollfaz]

I encounter this issue when trying to make this program in Java.
My first input is a number n to indicate how many lines of input for Java to expect next. For each of my next n lines of input, it is in this format
'name value', e.g 'bolt 9.58'. Then for each line, I want java to append the name, value into a hashtable in the format (String name, float value).
The following is my code:

import java.util.*;
import java.io.*;
public class bestrelay{
    public static void main(String[]args){
        Scanner sc= new Scanner(System.in);
        int n=sc.nextInt()+1;
        Hashtable<String,Float> data1=new Hashtable<String,Float>();
        Hashtable<String,Float> data2=new Hashtable<String,Float>();
        for (int i=0;i<n;i++){
            String next_=sc.nextLine();
            String[] parts= next_.split(" ");
            data1.put(parts[0],Float.parseFloat(parts[1]));
            data2.put(parts[0],Float.parseFloat(parts[2]));

        }
    System.out.println(data1);
    }
}

However after inputting the input n I received this error: ArrayIndexOutofBounds Exception
I need to find out whats the problem

 

[Borg]

Java arrays have their size predefined and can't be resized on the fly. If you want to increase the size as you add items, you should use a list.

 

[Filip Larsen]

You need to check the length of the array returned from split. I assume the exception you are getting is from this line which means the split did give less than 3 parts.

 

[Filip Larsen]

Java arrays have their size predefined and can't be resized on the fly.

In this case the array is returned by split.

 

[Borg]

Hard to read without code tags.

 

[jack action]

Shouldn't this line:

int n=sc.nextInt()+1;

Be:

int n=sc.nextInt();

 

[Mark44]

Hard to read without code tags.

Now fixed.

 

[FactChecker]

Some of the functions called will throw an exception. To write good code, especially if it is misbehaving, you should get in the habit of catching exceptions and displaying them when they happen.
This is especially true when a lot of external input is being processed. You might be surprised at how frequently the input is invalid.

 

[willem2]

Why does your program use 2 hash tables? That's not in the specification.
Your programs appears to read lines of the from "bolts 1.4 1.2" and then put ("bolts", 1.4) in the first hash-table and ("bolts", 1.2) in the second hashtable. At the end, only the first hash table is returned. making all operations with the second hash table redundant.
If your input lines are of the form "<string> <floating point number>" this will result in an error when trying to use parts[2].
If your input line are really of the form "<string> <floating point number> <floating point number>", I think you'll get the problem mentioned by jack action, and your program will likely go wrong when reading the last non-existing line.