Integer.parseInt error help

[TheElder777]

Hello all. I have been debugging this piece of crap the whole day, with no luck. Please help me out thank you.
So, addBack takes a String, int, int, int as arguments. Im getting the .next() from a file and storing it in one of the temp variables. Then i need to change the temp variables from string to int, so I use Integer.parseInt(tempx) to convert. But i am getting the following error:
Exception in thread "main" java.lang.NumberFormatException: For input string: " -99"
at java.lang.NumberFormatException.forInputString(Num berFormatException.java:65)
at java.lang.Integer.parseInt(Integer.java:470)
at java.lang.Integer.parseInt(Integer.java:514)
at hw2.getList(hw2.java:44)
at hw2.main(hw2.java:12)
Where "-99" is the first value that is to be converted (in other words it is the value that resides in temp0)


Here is (part of) my code:

String aName;
Scanner myBuff = null;
String temp0;
String temp1;
String temp2;
while(myBuff.hasNext()){
	for(int i = 0; i < 4; i++){
		aName = myBuff.next();	
		temp0 = myBuff.next();
		temp1 = myBuff.next();					
                temp2 = myBuff.next();
		myDLL.addBack(aName, Integer.parseInt(temp0), Integer.parseInt(temp1), Integer.parseInt(temp1));
	}
}

[doWhile]

Exception in thread "main" java.lang.NumberFormatException: For input string: " -99"

Errors like this are worth reading closely...note the leading space for the String passed to Integer.parseInt (which will not be parsed as an int, hence the exception). The String class has methods to deal with leading/trailing whitespace (eg trim() ).

[TheElder777]

Wow, that makes a lot of sense. Thank you so much for your help and quick reply. One more question if you do not mind. I have: myBuff.useDelimiter(","); somewhere in my code, would .trim() still work?

Once again thank you

[DarrylBurke]

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[doWhile]

Wow, that makes a lot of sense. Thank you so much for your help and quick reply. One more question if you do not mind. I have: myBuff.useDelimiter(","); somewhere in my code, would .trim() still work?

Did you try it? Did it work? If not, then post the relevant code as an SSCCE with all errors or explicit definitions of misbehavior and go from there.

[killutch]

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If myBankAccount+= getDollar(); for every time I've seen this post.....

[TheElder777]

No, I'm having a problem taking inputs from the file. Here is my code. I will be trying to debug it myself in the mean time. Thank you.

import java.util.*;
import java.io.IOException;
import java.io.FileReader;
public class hw2{
	public static void main(String[] args){
		System.out.println("[*] Getting list...");
		if(args.length == 3){
			System.out.println("[!] Will read from " + args[0]);
			DLinkedList newList = getList(args[0]);
		}else{
			System.out.println("[!] args[2] is empty. Will auto-read points.txt");	
			DLinkedList newList = getList("points.txt");
		}
		System.out.println("[*] List obtained.");

		System.out.println("[*] Sorting...");
		//aSort(newList, args[2]);	
		System.out.println("[*] Sorting complete.");
	}
	public static DLinkedList getList(String fileName){
		System.out.println("in getList...");
		String aName;
		Scanner myBuff = null;
		String temp0;
		String temp1;
		String temp2;
		DLinkedList myDLL = new DLinkedList();
		try{
			System.out.println("in try");
			myBuff = new Scanner(new FileReader(fileName));
			myBuff.useDelimiter(",");
			myBuff.nextLine();
			while(myBuff.hasNext()){
				System.out.println("in while");
				for(int i = 0; i < 4; i++){
					System.out.println("in for");
					aName = myBuff.next();	
					temp0 = myBuff.next();
					temp1 = myBuff.next();
					temp2 = myBuff.next();
					System.out.println("before addBack");
					//myDLL.addBack(aName, Integer.parseInt(temp0.trim()), Integer.parseInt(temp1.trim()), Integer.parseInt(temp2.trim()));
					System.out.println("end of for");
				}
				System.out.println("end of while");
			}
			myBuff.close();
			System.out.println("end of try");
		}catch(IOException e){e.printStackTrace();}	
		System.out.println("end of get");
		return myDLL;
	}
}

[TheElder777]

Did you try it? Did it work? If not, then post the relevant code as an SSCCE with all errors or explicit definitions of misbehavior and go from there.

Hello again. So i finally got rid of all the errors. Your comment helped a lot.

For anyone wondering how I got to fix it, I used this in my code:

myBuff.useDelimiter(",|\\n");

where myBuff is of type Scanner.
To have commas and new line character as delimiters.