Question on reading one character at a time.

Hi. I am assigned a program where I have to read a series of bits (for example: 01010101). Using this I have to make a "graph out of it". The way I am supposed to make a graph is as follows:
Each bit interval will be represented in the output as a field taht is two characters wide.
The value of the signal is represented using either + (to represent +voltage) or - (to represent - voltage) and is always the second character in the output field.
The first character in the output field is either:
' . ' = to indicate no change from the previous signal value or
' / ' = to indicate a negative to positive transition or else
' \ ' = to indicate a positive to negative transition
Example for input: 01010101 and the output would be . + \ - . - / + \ - . - / + . + \ - / +
The code that I got so far is that I read the input from the command line as a argument which I know is nothing but I would just like to know how to read the character one by one and make a graph which is totally boggling my mind because I have no idea how I can do it. Thank you for your help.
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Encoder
     public static void main(String[] args)
          int b = Integer.parseInt(args[0].trim());
          System.out.println("You spit out --> "+b);

Alright I sorta got what you were sayin'. The code that I have now is:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Encoder
     public static void main(String[] args)
          String toEncode = String.valueOf(args[0]);
          StringBuffer result = new StringBuffer();
          char lastChar = toEncode.charAt(0);
          char curChar = '0';
          char lastSign = '+';
          int length = toEncode.length();
          for (int i = 0; i < length; i++)
          curChar = toEncode.charAt(i);
          if (curChar != lastChar)
          if (curChar == '0')
          result.append("\\-");
          lastSign = '-';
          else
          result.append("/+");
          lastSign = '+';
          lastChar = curChar;
          else
          result.append(".");
          result.append(lastSign);
          System.out.println("You spit out --> "+result);
But it doens't work according to what I want it to do. What I need it to do is the following: Lets say we have the input of 01010101, the result we will get is ". + \ - . - / + \ - . - / + . + \ - / +". The reason for this is because of the following: The graph starts on the v all the time. When there is a 0 bit there is no change and when there is a 1 bit there is an inversion of the voltage level so since we started with a 0 bit at v, when we hit 1 bit we would make a inversion to -v and when we hit 0 bit there would be no change. I don't know of what I said is clear to you or not. For this program, what it does for the input of 01010101, the output is
" . + / + \ - / + \ - / + \ - / + ". Thank you very much.

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