user input

[Abdul Latif]

please tell me how do you recieve user input from the user please elaborate in detail

[Roy Ben Ami]

you mean in console mode or in windows mode?

[Younes Essouabni]

If you have to pass some arguments to launch your application you can use this syntax
java NameOfYourApplication arg1 arg2 arg3 ...
You may acces those arguments within your main method (public static void main (String args[])
where args represents the arguments the user have entered
So you may do something like that
if (args[0]==...)
I hope it helps!

[herb slocomb]

To prompt users and get input in a String :
String name = JOptionPane.showInputDialog("Enter name " );

From the API for JOptionPane class at :http://java.sun.com/j2se/1.3/docs/api/

"showConfirmDialog Asks a confirming question, like yes/no/cancel.
showInputDialog Prompt for some input.
showMessageDialog Tell the user about something that has happened.
showOptionDialog The Grand Unification of the above three. "

[Pradyumna Hari]

Hi Abdul,
I guess you are asking a beginner question :
There are two ways:
(1) Through console
Please go thorough the code below

import java.io.*;
public class Read {
    public static void main(String args[]){
        System.out.println("Please enter something");
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        try{
            String strInput = br.readLine();
            System.out.println("You entered "+strInput);
            br.close();
        }catch(IOException e){
            e.printStackTrace();
        }
    }
}

(2) Through GUI
Here is the crude code. You would need to read about ActionListeners to understand this

import javax.swing.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class VisualRead{
    public static void main(String args[]){
        JFrame fr = new JFrame("My Frame");
        fr.pack();
        fr.setVisible(true);
        JPanel pan = new JPanel();
        JLabel l = new JLabel("Enter some String and press the button ");
        JButton b = new JButton("Submit");
        final JTextField tx = new JTextField("                       ");
        final JTextField tx2 = new JTextField("               ");
        final JLabel l2 = new JLabel("  ");
        b.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
                l2.setText(" You Entered ");
                tx2.setText(tx.getText());
            }
        });
        pan.add(l);
        pan.add(tx);
        pan.add(b);
        pan.add(l2);
        pan.add(tx2);
        fr.getContentPane().add(pan);
        fr.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
     }
}

[Abdul Latif]

suppose there is a program that takes two numbers from the user and then adds & displays the result.I am talking about this basic input from the user.I hope u r getting me

[Gregg Bolinger]

Looks to me like Pradyumna has answered your question. What are you not understanding?

[Dirk Schreckmann]

Do keep in mind that you can get some input from the user when the user invokes the application at the command line.
java Whatever arg1 arg2
Here's the basic framework that displays all of the command line arguments when invoked from the command line:

public class Whatever 
{
    public static void main( String[] args ) 
    {
        for ( int i = 0 ; i < args.length ; i++ ) 
        {
            System.out.println( args[ i ] );
        }
    }
}

Are you getting any ideas yet?

[Abdul Latif]

thanks
but please tell me how to accecpt multiple agrs like first the user will enter the number that no has to be accecpted & then when the user enters another no that no also has to be accecpted

[Dirk Schreckmann]

Abdul,
It sounds like you'll want to implement Pradyumna's example above, adding to it some logic testing the validity of the initial input, then reusing Pradyumna's example if the input was accepted.
If you were to post an example of what you've figured out so far, then others could best help you out.
Good Luck.