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From: Saeed Amrollahi <amrollahi.saeed@gmail.com>
Newsgroups: comp.lang.java.programmer
Subject: Re: The greeting code in Java
Date: Sun, 19 Jun 2011 12:15:01 -0700 (PDT)
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On Jun 19, 8:36=A0pm, rossum <rossu...@coldmail.com> wrote:
> On Sun, 19 Jun 2011 06:05:53 -0700 (PDT), Saeed Amrollahi
>
>
>
> <amrollahi.sa...@gmail.com> wrote:
> >Dear all
> >Hi
>
> >I'm a C++ programmer and I started to learn Java. After famous "Hello
> >World"
> >program, the obvious code is "Say hello to specific people". Program
> >asked
> >user's name, then print a greeting message. The C++ code is:
> >#include <iostream>
> >#include <string>
> >Using std::cin; =A0 =A0 using std::cout; =A0 =A0 =A0 =A0using std::strin=
g;
> >int main()
> >{
> > =A0// ask for the person's name
> > =A0std::cout << "Please enter your first name: ";
> > =A0std::string name; // define name
> > =A0std::cin >> name; =A0 // read into name
> > =A0// write a greeting
> > =A0std::cout << "Hello, " << name << "!" << std::endl;
>
> > =A0return 0;
> >}
> >I tried to write the simplest code in Java and I ended up with the
> >following:
>
> >package Greeting;
> >import java.io.*;
>
> >public class Main {
>
> > =A0 =A0public static void main(String[] args) throws IOException {
> > =A0 =A0 =A0 =A0System.out.print("Please enter your first name: ");
> > =A0 =A0 =A0 =A0String name =3D new String();
> > =A0 =A0 =A0 =A0Reader r =3D new InputStreamReader(System.in);
> > =A0 =A0 =A0 =A0for (char ch; (ch =3D (char)(r.read())) !=3D '\n'; name =
+=3D ch) {}
> > =A0 =A0 =A0 =A0System.out.println("Hello, " + name);
> > =A0 =A0}
> >}
>
> >What are the problems of my code and how can I write
> >a better one. Please throw some light.
>
> >TIA,
> > =A0-- Saeed Amrollahi
>
> Stream readers are more often used for binary input. =A0For text input
> people tend to use the java.util.Scanner class.
>
> =A0 public static void main(String[] args) {
> =A0 =A0 System.out.print("Please enter your first name: ");
> =A0 =A0 Scanner sc =3D new Scanner(System.in);
> =A0 =A0 String name =3D sc.nextLine();
> =A0 =A0 System.out.println("Hello, " + name);
> =A0 }
>
> rossum

What is the Scanner? Why we use nextLine? What's the relation of
such concepts with a simple greeting program.
Why the code for writing "Hello, world" is in chapter 1, page 1
of The Java Programming Language, but the code of greeting may be in
Chapter 20!
  -- Saeed
for