Read interactive command-line input with Java

The basic technique of reading a String provided by a user at a  command-line is fairly simple, but more lengthy than you’d expect. It involves the use of the System.in object, along with the InputStreamReader and BufferedReader classes. The code in Listing 1 shows how you can prompt the user to enter a String value, such as their name, and then read that value. for more  read this

Example :

import java.io.*;

public class ReadString {

   public static void main (String[] args) {

      //  prompt the user to enter their name
      System.out.print("Enter your name: ");

      //  open up standard input
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

      String userName = null;

      //  read the username from the command-line; need to use try/catch with the
      //  readLine() method
      try {
         userName = br.readLine();
      } catch (IOException ioe) {
         System.out.println("IO error trying to read your name!");
         System.exit(1);
      }

      System.out.println("Thanks for the name, " + userName);

   }

}  // end of ReadString class
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