Having more then one class

Question

Right i'm trying the write the game Mastermind (if you have not played it or know what i'm on about heres a web site with the game on http://www.irt.org/games/js/mind/) Right so far its going pretty well, but i was talking to a friend who told me i should not just have one big class, so i'm having a go at useing class's , buts it not going very well. I'm trying to make the part of the program which random selects the colours in to one class and the rest of the program as another for the time being. Heres the code:
/// MasterMind1
import javax.swing.*;
public class MasterMind1 {
  public class Random {
    private static void Random(String args[]){
    int [] test;
    test = new int [4];
    String guess;
    int [] randomNumber;
    randomNumber = new int [4];
   for (int i=0; i < randomNumber.length; i++)  {
         randomNumber[i] = (int)Math.floor(1 + (8 * Math.random()));
         System.out.println("no is " + randomNumber);
} // end for loop
test[0] = randomNumber [0];
test [1] = randomNumber [1];
test [2] = randomNumber [2];
test [3] = randomNumber [3];
//end class Random
public class void main (string arge[])
guess=JOptionPane.showInputDialog ( "Enter integer" );
playerGuess[0] = Integer.parseInt(guess);
guess=JOptionPane.showInputDialog ( "Enter integer" );
playerGuess[1] = Integer.parseInt(guess);
guess=JOptionPane.showInputDialog ( "Enter integer" );
playerGuess[2] = Integer.parseInt(guess);
guess=JOptionPane.showInputDialog ( "Enter integer" );
playerGuess[3] = Integer.parseInt(guess);
for (int i=0; i < test.length; i++)
if (test[i] == playerGuess[i] )
JOptionPane . showMessageDialog ( null, " Well done " +playerGuess[i], "hello",
JOptionPane.PLAIN_MESSAGE );
else
JOptionPane . showMessageDialog ( null, " Your wrong " +playerGuess[i], "hello",
JOptionPane.PLAIN_MESSAGE );
if (test[i]==playerGuess[i]){
pico [i]=2;
test[i] = 0;
playerGuess[i]=0;}
for (int i=0; i < test.length; i++){
if (test[i] != 0);
for (int k=0; k < playerGuess.length; k++){
if (playerGuess [k] != 0 )
if (test[i] == playerGuess[k]){
fermis[i][i]= 1;
test[i]=0;
playerGuess[k]=0; }
score [0]= fermis [0][0] + fermis [0][1] + fermis [0][2]+
fermis [1][0] + fermis [1][1] + fermis [1][2]+
fermis [2][0] + fermis [2][1] + fermis [2][2]+
fermis [3][0] + fermis [3][2]+ fermis [3][3];
score [1] = pico[0] + pico[1] + pico[2] + pico[3];
System.out.println (score[0]);
System.out.println ( score[1]);
System.exit( 0 );
}// end main
When i try to compill it just comes up with errors i'm not total sure why, mind you not sure what i'm doing anyways so its a bit hard to tell what i've done wrong. The way i've set the class's is it right? Also the Array with the random colours are in the 1st class, in the 2nd class do i need to do anything speical or does it not matter which class you make the array any class can see it and use it, even if its private?

Answer 1

The basic structure of a class is something like this, but do have a look at the tutorials.
public class SomeClassName {
        //Declare some member variables
        int i;
        Player player;
        //Declare some methods
        public int returnAValue(){
                //Write some method code
        public static void main(String[] args) {        
                //You don't need a main
                // But if you have one it must have the above signature.
}   // end class