How to get Input from User in Java

import java.util.Scanner;

class getuserinput

{

public static void main(String args[])

{

int a;

float b;

String c;

System.out.println("Enter integer");

a = in.nextInt();

System.out.println("The Value is "+a);

Scanner in = new Scanner(System.in);

System.out.println("Enter float");

b = in.nextFloat();

System.out.println("The Value is "+b);  

System.out.println("Enter string");

c = in.nextLine();

System.out.println("The Value is "+c);

}

}

Java Code to Read Text File

import java.io.*;

class ReadFile

{

public static void main(String args[])

{

try{

FileInputStream fstream = new FileInputStream("C:\\java\\demo\\file.txt");

DataInputStream in = new DataInputStream(fstream);

BufferedReader br = new BufferedReader(new InputStreamReader(in));

String Data;

while ((Data = br.readLine()) != null)   {

System.out.println (Data);

}

in.close();

}

catch (Exception e)

{

System.err.println("Error: " + e.getMessage());

}

}

}

Java Code to Send Email

package Javamails;

import javax.mail.*;

import java.util.*;

public class Javamail

{

public static void main(String[] args)throws MessagingException

{

String from = "udhaya1987devtest@gmail.com",

password = "",

host = "smtp.gmail.com",

port = "8000",

to = "infy1998soft@sorgam.com",

subject = "Hi",

message = "Hi Team";

Properties props = new Properties();

props.put("mail.smtp.user", from);

props.put("mail.smtp.host", host);

props.put("mail.smtp.port", port);

props.put("mail.smtp.starttls.enable","true");

props.put("mail.smtp.auth", "true");

props.put("mail.smtp.socketFactory.port",port);

props.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");

props.put("mail.smtp.socketFactory.fallb","false");

SecurityManager security = System.getSecurityManager();

try

{

Authenticator auth = new SMTPAuthenticator();

Session session = Session.getInstance(props, auth);

MimeMessage msg = new MimeMessage(session);

msg.setText(message);

msg.setSubject(subject);

msg.setFrom(new InternetAddress(from));

msg.addRecipient(Message.RecipientType.TO,new InternetAddress(to);

Transport.send(msg);

}

catch(Exception mex)

{

mex.printStackTrace();

}

}

}

class SMTPAuthenticator extends javax.mail.Authenticator

{

String from = "sender_id@gmail.com",

password = "password",

host = "smtp.gmail.com",

port = "8000",

to = "infy1998soft@sorgam.com",

subject = "Hi",

message = "Hi Team";

public PasswordAuthentication getPasswordAuthentication()

{

return new PasswordAuthentication(from, password);

}

}