How to read comma separated integer inputs in java

Question

import java.io.*;
import java.util.*;
class usingDelimiters
{
    public static void main(String args[])
    {
        Scanner dis=new Scanner(System.in);
        int a,b,c;
        a=dis.nextInt();
        b=dis.nextInt();
        c=dis.nextInt();
        System.out.println("a="+a);
        System.out.println("b="+b);
        System.out.println("c="+c);
    }
}

This program is working fine when my input is 1 2 3 (separated by space) But, how to modify my program when my input is 1,2,3 (separated by commas)

comma separated integers == comma separated values == CSV == use OpenCSV? By hand is OK if it's toy code, but for serious work, consider using OpenCSV. — fge, Apr 08 '14 at 11:56

Mena · Answer 1 · 2014-04-08T12:04:28.997

You can use a delimiter for non-numerical items, which will mark any non-digit as delimiter.

Such as:

dis.useDelimiter("\\D");

The useDelimiter method takes a Pattern or the String representation of a Pattern.

Full example:

Scanner dis=new Scanner(System.in);
dis.useDelimiter("\\D");
int a,b,c;
a=dis.nextInt();
b=dis.nextInt();
c=dis.nextInt();
System.out.println(a + " " + b + " " + c);
dis.close();

Inputs (either or)

1,2,3
1 2 3

Output

1 2 3

Note

Don't forget to close your Scanner!
See the API for Patterns for additional fun delimiting your input.

score 11 · Accepted Answer · answered Apr 08 '14 at 11:59

you can use the nextLine method to read a String and use the method split to separate by comma like this:

public static void main(String args[])
    {
        Scanner dis=new Scanner(System.in);
        int a,b,c;
        String line;
        String[] lineVector;

        line = dis.nextLine(); //read 1,2,3

        //separate all values by comma
        lineVector = line.split(",");

        //parsing the values to Integer
        a=Integer.parseInt(lineVector[0]);
        b=Integer.parseInt(lineVector[1]);
        c=Integer.parseInt(lineVector[2]);

        System.out.println("a="+a);
        System.out.println("b="+b);
        System.out.println("c="+c);
    }

This method will be work with 3 values separated by comma only.

If you need change the quantity of values may you use an loop to get the values from the vector.

How to read comma separated integer inputs in java

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