store string in array using scanner

Question

I have a file in path d:\input.txt I want get this path from user with Scanner class Here is my code but i recevie ArrayIndexOutOfBoundException Why?

if(args.length != 0)
        {
            readerWriter.readFile(args[0]);
        }
        else
        {
            System.out.println("Plese enter the path of your file");                
            Scanner filePath = new Scanner(System.in);
            args[0] = filePath.next();
            readerWriter.readFile(args[0]);
        }

@mahdieh at which line you get ArrayIndexOutOfBoundException ? — Harmeet Singh
– Harmeet Singh, Commented Aug 16, 2015 at 7:20

PatrykG · Accepted Answer · 2015-08-16 07:27:47Z

1

You can't using array here args[0] = filePath.next(); because your array is not initialized and give ArrayIndexOutOfBoundException, try:

String file = filePath.next(); readerWriter.readFile(file);

answered Aug 16, 2015 at 7:27

PatrykG

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1 Comment

Basil Bourque Over a year ago

@mahdieh If an Answer provided some value, please give the Answer an upvote (click the upward triangle if viewing in a web browser). If an Answer solves your problem or resolves your Question, accept the Answer (click the big empty checkmark appearing below the downward triangle, if in a browser). Acceptance signals to other readers that you consider the Question closed/resolved.

Malaka Gunawardhana · Accepted Answer · 2015-08-16 07:27:59Z

0

It is simple, if

args.length == 0

you cannot access

args[0]

So you have to change the lines,

args[0] = filePath.next();
readerWriter.readFile(args[0]);

into

String myPath = filePath.next();
readerWriter.readFile(myPath);

answered Aug 16, 2015 at 7:27

Malaka Gunawardhana

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Comments

Aniket Thakur · Accepted Answer · 2015-08-16 07:28:43Z

0

This will happen if args.length is 0.

You should do

if(args.length != 0)
        {
            readerWriter.readFile(args[0]);
        }
        else
        {
            System.out.println("Plese enter the path of your file");                
            Scanner filePath = new Scanner(System.in);
            readerWriter.readFile(filePath.next());
        }

and not use args[0] in else.

Program will go in else block if args.length == 0 and args[0] = filePath.next(); will give ArrayIndexOutOfBoundException

edited Aug 16, 2015 at 7:28

answered Aug 16, 2015 at 7:20

Aniket Thakur

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3 Comments

Sharon Ben Asher Over a year ago

have you looked at the first line?

Aniket Thakur Over a year ago

Yes program will go in else if args.length == 0 and args[0] = filePath.next(); will give ArrayIndexOutOfBoundException .

Sharon Ben Asher Over a year ago

oops, my bad, forgot to take my coffee this morning :)

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