Reading inputs in java

Question

import java.io.*;
public class inputting {
/**
* @param args
* @throws IOException 
*/
public static void main(String[] args) throws IOException {
// TODO Auto-generated method stub
BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
System.out.println("number??");
String str;
     int i=0;
    while (i<5) {
            str=br.readLine();
            int n = Integer.parseInt(str);
            System.out.println(n);
        i++;}
}

}

if i want to read 5 integers how do i do that? what extra code i need to write?

Think about using a "loop" such as a for loop if you know in advance how many ints you want the user to add, or a do-while loop if you don't. Also, you might want to consider formatting that code with appropriate indentations, cowboy. — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Aug 18, 2011 at 1:39
@Karan: the edits you need are to use a loop as has been suggested many many times in the answers below and in my comment above. Give it a try, you won't be disappointed. — Hovercraft Full Of Eels
– Hovercraft Full Of Eels, Commented Aug 18, 2011 at 1:50
@Hovercraft Full Of Fuels it says str cannot be resolved, i guess i need to define str before or something else? — Kraken
– Kraken, Commented Aug 18, 2011 at 1:52

evandrix · Accepted Answer · 2011-08-18 01:40:35Z

3

You should always use a Java Scanner to read inputs.

To your existing code, assuming String str = br.readLine(); makes str contain the line of at least one integer, eg. "10 20 30 40 50"

What you need to do is:

Scanner sc = new Scanner(str);
While (sc.hasNext())
{
   System.out.println(sc.nextInt());
   // ...or assign it to an array elment...your choice!
}

answered Aug 18, 2011 at 1:40

evandrix

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6 Comments

Kraken Over a year ago

i know but how do i use the loops for dividing that string into integers?

Hovercraft Full Of Eels Over a year ago

@Karan: that comment makes no sense. If you're using Scanner, the input already is in int form.

evandrix Over a year ago

It's called string tokenisation, and that's precisely the whole point of the Java Scanner class - to abstract away the work for you.

Kraken Over a year ago

@Hovercraft Full Of Eels i am not using scanner, using the same code.

Kraken Over a year ago

@evandrix how do i tokenize it.. plz help?

|

talnicolas · Accepted Answer · 2011-08-18 01:40:54Z

0

If you want to ask multiple times the question number?? you just need to use a for or while loop around these three lines:

System.out.println("number??");
String  str = br.readLine();
int n = Integer.parseInt(str);

and add the read numbers to a list so you'd just need to change the last line.

answered Aug 18, 2011 at 1:40

talnicolas

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Comments

scott · Accepted Answer · 2011-08-18 01:41:03Z

0

wrap your readline in a while loop that checks for user input to quit

        while ( !(str = br.readLine()).equalsIgnoreCase("q")) {
            int n = Integer.parseInt(str);
            System.out.println(n);
        }

answered Aug 18, 2011 at 1:41

scott

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