Help with program input

[Daniel]

Hi I'm having some trouble trying to work out how to accept user input from the keyboard.

I would really like to get the hang of Java but I'm finding it very difficult so any help would be greatly appreciated.

What I have done so far:

Code:

import java.io.*;
import java.util.*;

/**
* Used to recieve input from the user.
*
* Cameron Lett
* 8/4/07
*/


public class Input
{

/**
* Constructor for objects of class input
*/

public static void main (String[] args) throws java.io.IOException
{

String b1;
String b2;

// set up the buffered reader to read from the keyboard
BufferedReader br = new BufferedReader (new FileReader ("plus.txt"));

b1 = br.readLine();

System.out.println ("Enter a Number");
}
}

The basic idea is to accept user input while reading from a text file.
Thanks

Daniel

[Albert]

So let's look at your file input

Code:

BufferedReader br = new BufferedReader (new FileReader ("plus.txt"));

You create a BufferedReader object, that takes in a Reader of some type.
This time you've decided to use a FileReader in order to get the information inside of plus.txt

Well with Keyboard input you can do basically the exact same thing.
Instead of using a FileReader, however, you want to use what is called an InputStreamReader.
This is used to get the input stream device and put it into the bufferedreader.

An example I quickly coded up is shown below, including weak exception handling.

Code:

import java.io.*;
public class test
{

  public static void main (String args[])
  {
    try 
    {
      BufferedReader stdin = new BufferedReader(new InputStreamReader(System.in));
      System.out.print("Input Some String: ");
      String line = stdin.readLine();
      System.out.println("You typed: " + line);
      stdin.close();
    }
    catch (IOException io)
    {
      System.err.println("IO Exception Caught");
      io.printStackTrace();
    }
  }
}

Greetings
Albert