import java.io.*;

public class substrings {

        public static void main(String[] args) {
                               
                InputStreamReader istream = new InputStreamReader(System.in);
                BufferedReader bufRead = new BufferedReader(istream);
               
                String text;
                String name1;
                String name2;
               
                System.out.println("enter your full name");
                try
                {
                text = bufRead.readLine();
                name1 = text.substring(0,text.indexOf(" "));
                name2 = text.substring(text.indexOf(" ")+1);
               
                System.out.println(name1);
                System.out.println(name2);
                }
                catch(Exception e)
                {
                        System.out.println("error occured");
                }
       
        }
}

String input = "John Doe"; // lets suppose this is the input you get
String[] names = input.split(" ");

System.out.println(names[0]);  // First name
System.out.println(names[1]);  // Last name

import javax.swing.JOptionPane;

class Nameshon
{
  private String firstName, lastName, name, initials;
  private char lastLetter;
 
  public void getName ()
  {
    name = JOptionPane.showInputDialog ("Put your full name with a space between your first and last name.");
   
    firstName = name.substring(0,text.indexOf(" "));
    lastName = name.substring(text.indexOf(" ")+1);
  }
 
  public void getLetter ()
  {
     lastLetter = nameCharAt(name.length()/2);
  }
 
  public void getInitials ()
  {
    initials = firstNameCharAt(1) + lastNameCharAt (1);
   
  }
 
  public static void main (String args [])
  {
    System.out.println ("Your name is " + name + ".");
    System.out.println ("Your first name is " + firstName + ".");
    System.out.println ("Your last name is " + lastName + ".");
    System.out.println ("The middle letter in your last name " + lastName + " is " + lastLetter + ".");
    System.out.println ("Your initials are " + initials + ".");
  }
}

import javax.swing.JOptionPane;
 
class Nameshon
{
    private String name;

    Nameshon(String pname) {
        name = pname;
    }
  
    public String getFullName()  {
        return name;
    }
  
    public char getLetter ()
    {
        String lname = getLastName();
        return lname.charAt((int)lname.length()/2);
    }
  
    public String getInitials ()
    {
         return ((String) ("" + name.charAt(1) + name.charAt(name.length() - 1)).toUpperCase();
    }

    public String getFirstName() {
        return  name.substring(0, name.indexOf(" "));
    }

    public String getLastName() {
        return name.substring(name.indexOf(" ") + 1);
    }
  
  public static void main (String args [])
  {
    String result = JOptionPane.showInputDialog ("Put your full name with a space between your first and last name.");
    Nameshon name = new Nameshon(result);
    System.out.println ("Your name is " + name.getFullName() + ".");
    System.out.println ("Your first name is " + name.getFirstName() + ".");
    System.out.println ("Your last name is " + name.getLastName() + ".");
    System.out.println ("The middle letter in your last name is " + name.getLetter() + ".");
    System.out.println ("Your initials are " + name.getInitials() + ".");
  }
}