CODEWITHSUNDEEP
javastringconsolesplitreadline
David Sonnenfeld
David Sonnenfeld

Reputation: 698

Java: How to get values from console input easily

As a user I type following command into the java console:

!login <Username> <udpPort>

so, i.e.

!login Bob 2233

What I need is to easily get the values from this input:

String username = "Bob";
int port = 2233;

I am using a BufferedReader to get the input.

I already tried: But of course this is not working. But thats what I would like to have:

String [] input = in.readReadLine(); //ofcourse this is not working

Then I can easily assign the values:

String username = input[2]; //save "Bob"
int port = Integer.parseInt(input[3]); //save 2233

Any advices appreciated, Dave

Upvotes: 1

Views: 8539

Answers (4)

Sandeep Nautiyal
Sandeep Nautiyal

Reputation: 111

Scanner class is best suited for taking input from console.

import java.util.*;

public class ConsoleInput { 
    public static void main(String[] args) {
        Scanner scanInput = new Scanner(System.in);
        String input = scanInput.nextLine();
        System.out.println("The input is : "+ input);  
    }  
}

This is a simple class demonstrating the use of Scanner class in Java. It has several method that can help you in reading different types of inputs for ex- int, char, String, etc.

Upvotes: 2

Yogendra Singh
Yogendra Singh

Reputation: 34367

I think you can use java.util.Scanner as below:

  Scanner inputScanner = new Scanner(System.in);
  inputScanner.next(); //reads whole word
  inputScanner.nextInt(); //reads whole numeral
  inputScanner.nextLine(); //reads whole line

Now using nextLine, read the line and split

   String line = inputScanner.nextLine();
   String[] commands = line.split(" "); //splits space delimited words in the line

or using next(), read one command at time e.g.

  command[0] = inputScanner.next(); 
  command[1] = inputScanner.next();

Or you can use next() and nextInt()

  String username = inputScanner.next();  //save "Bob"
  int port = inputScanner.nextInt(); //save 2233

More method details here. Scanner

Upvotes: 0

Bhesh Gurung
Bhesh Gurung

Reputation: 51030

You should do

String [] input = in.readReadLine().split("\\s+"); // split the line at spaces

And use index 1 and 2 because array index starts from 0 not 1

String username = input[1]; //get the second element of the array
int port = Integer.parseInt(input[2]); //get the third element and parse

Upvotes: 0

kosa
kosa

Reputation: 66637

BufferedReaeder readLine() method return String.

Once you get String, you need to either Split(); (or) StringTokenizer to get as separate Strings.

Upvotes: 3

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