Java Intro student needs help on arrays

Question

As my first assignment I have created a program called RobotRat which has a "Rat" move north, south, east, or west on an array floor. I have the program running but am having trouble creating my "floor" using a two-dimensional array. My teacher also wants us to use boolean values for our array. I am drawing a blank on how to create this. From my books I have gathered the following code but cannot get it to work. Any help would be greatly appreciated:
1.public class RobotRatArray
2.{
3.
4. dataType RobotRatArray[] [];
5. int matrix [] [];
6. matrix = new int [20] [20];
7.
8.
9.}

Answer 1

Okay, I just spoke with a classmate of mine and they said my array isn't in another window. I need to do some system.out.print commands so they print out on my dos window. I am just so confused with this program. I am going to copy and paste it in here in case anyone has any guidance for me. It would be greatly appreciated. (Sorry, I can't figure out how to get my line numbers to populate from textpad when I paste in this message)
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class RobotRat extends JFrame implements ActionListener
     private JPanel panel1 = null;
     private JPanel panel2 = null;
     private JPanel panel3 = null;
     private JLabel label1 = null;
     private JLabel label2 = null;
     private JLabel label3 = null;
     private JTextField textfield1 = null;
     private JButton button1 = null;
     private JButton button2 = null;
     private JButton button3 = null;
     private JButton button4 = null;
     private boolean[][] floor = null;
     private int current_column = 21;
     private int current_row = 21;
     private static final int UP = 1;
     private static final int DOWN = 0;
     private static final int NORTH = 0;
     private static final int EAST = 1;
     private static final int SOUTH = 2;
     private static final int WEST = 3;
     private int pen_position = UP;
     private int rats_direction = EAST;
public RobotRat()
super("RobotRat");
label1 = new JLabel("Spaces: ");
textfield1 = new JTextField(40);
button1 = new JButton("Move North");
button2 = new JButton("Move South");
button3 = new JButton("Move East");
button4 = new JButton("Move West");
button1.addActionListener(this);
button2.addActionListener(this);
button3.addActionListener(this);
button4.addActionListener(this);
this.getContentPane().setLayout(new FlowLayout());
this.getContentPane().add(label1);
this.getContentPane().add(textfield1);
this.getContentPane().add(button1);
this.getContentPane().add(button2);
this.getContentPane().add(button3);
this.getContentPane().add(button4);
this.setSize(600, 100);
this.setLocation(100, 100);
this.show();
public void togglePen()
     switch(pen_position)
          case (UP): pen_position = DOWN;
          label1.setText("DOWN");
          break;
          case (DOWN): pen_position = UP;
          label1.setText("UP");
          break;
          default: break;
public void turnLeft()
     switch(rats_direction)
          case NORTH: rats_direction = WEST;
          label3.setText("WEST");
          break;
          case EAST: rats_direction = NORTH;
          label3.setText("NORTH");
          break;
          case SOUTH: rats_direction = EAST;
          label3.setText("EAST");
          break;
          case WEST: rats_direction = SOUTH;
          label3.setText("SOUTH");
          break;
public void move()
     int spaces_to_move = 0;
     try
          spaces_to_move=Integer.parseInt(textfield1.getText());
     catch(Exception e)
     switch(pen_position)
          case UP:
               switch(rats_direction)
                    case NORTH: ;
                    case SOUTH: ;
                    case WEST: ;
                    case EAST: ;
          break;
          case DOWN:
               switch(rats_direction)
                    case NORTH: ;
                    case SOUTH: ;
                    case WEST: ;
                    case EAST: ;
          break;
public void actionPerformed(ActionEvent e)
     if (e.getActionCommand().equals("TogglePen")) {
     togglePen();
     else if (e.getActionCommand().equals("TurnLeft")) {
     turnLeft();
public static void main(String[] args)
     RobotRat rr = new RobotRat();