Thread: Panel Problems?

Hello there, I'm very new to JAVA programming, and I'm currently enrolled in a JAVA programming class at College. I've gotten through most of our other projects fine (mainly because they were very simple) but this time we were given a more complex program to work with. In this program, there were originally 3 buttons labeled Circle, 3d Rectangle, and Rounded Rectangle. What we have to do as students is to add 3 additional buttons to the panel BELOW the 3 existing buttons. When I try to do this, all of the buttons end up coming out on one line even if I set the # of rows to 2 and the # of columns to 3. I've tried other variations for the rows/columns but they always end up only being on one line. I've even tried creating a new panel for the three new buttons but it still places all of the buttons on one line. Could someone point out what I'm doing wrong? After making the 2 row panel, I've also got to make the buttons work, as well as add a clear button.

Also the program comes in two parts, the first part is named Draw.Java, and the second is named Draw Canvas.Java.

/******************************************************************
 *  COURSE:             CSC231 Computer Science and Programming II
 *	Lab:			    Number 4
 *	FILE:				Draw.java
 *	TARGET:				Java 5.0 and 6.0
 *****************************************************************/
 
// Import Core Java packages
import java.awt.*;
import java.awt.event.*;
 
public class Draw extends Frame implements ActionListener, ItemListener {
 
	// Initial Frame size
	static final int WIDTH = 400;                // frame width
	static final int HEIGHT = 300;               // frame height
 
    // Color choices
    static final String COLOR_NAMES[] = {"None", "Red", "Blue", "Green"};
    static final Color COLORS[] = {null, Color.red, Color.blue, Color.green};
 
    // Button control
    Button circle;
    Button roundRec;
    Button threeDRec;
    Button square;
    Button oval;
    Button line;
 
    // Color choice box
    Choice colorChoice;
 
    // the canvas
    DrawCanvas canvas;
 
    /**
     * Constructor
     */
	public Draw() {
	    super("Java Draw");
        setLayout(new BorderLayout());
 
        // create panel for controls
        Panel topPanel = new Panel(new GridLayout(2, 3));
        add(topPanel, BorderLayout.PAGE_START);
 
        // create button control
        Panel buttonPanel = new Panel(new FlowLayout(FlowLayout.LEFT));
        topPanel.add(buttonPanel);
        circle = new Button("Circle");
        buttonPanel.add(circle);
        roundRec = new Button("Rounded Rectangle");
        buttonPanel.add(roundRec);
        threeDRec = new Button("3D Rectangle");
        buttonPanel.add(threeDRec);
        square = new Button("Square");
        buttonPanel.add(square);
        oval = new Button("Oval");
        buttonPanel.add(oval);
        line = new Button("Line");
        buttonPanel.add(line);
 
        // add button listener
        circle.addActionListener(this);
        roundRec.addActionListener(this);
        threeDRec.addActionListener(this);
        square.addActionListener(this);
        oval.addActionListener(this);
        line.addActionListener(this);
 
        // create panel for color choices
        Panel colorPanel = new Panel(new FlowLayout(FlowLayout.LEFT));
        topPanel.add(colorPanel);
        Label label = new Label("Filled Color:");
        colorPanel.add(label);
        colorChoice = new Choice();
        for(int i=0; i<COLOR_NAMES.length; i++) {
            colorChoice.add(COLOR_NAMES[i]);
        }
        colorPanel.add(colorChoice);
        colorChoice.addItemListener(this);
 
        // create the canvas
        canvas = new DrawCanvas();
        add(canvas, BorderLayout.CENTER);
	} // end of constructor
 
 
    /**
     *  Implementing ActionListener
     */
    public void actionPerformed(ActionEvent event) {
        if(event.getSource() == circle) {  // circle button
            canvas.setShape(DrawCanvas.CIRCLE);
        }
        else if(event.getSource() == roundRec) {  // rounded rectangle button
            canvas.setShape(DrawCanvas.ROUNDED_RECTANGLE);
        }
        else if(event.getSource() == threeDRec) { // 3D rectangle button
            canvas.setShape(DrawCanvas.RECTANGLE_3D);
        }
        else if(event.getSource() == square) { // square button
            canvas.setShape(DrawCanvas.SQUARE);
        }
        else if(event.getSource() == oval) { // oval button
            canvas.setShape(DrawCanvas.OVAL);
        }
        else if(event.getSource() == line) { // line button
            canvas.setShape(DrawCanvas.LINE);
        }
    }
 
    /**
     * Implementing ItemListener
     */
    public void itemStateChanged(ItemEvent event) {
        Color color = COLORS[colorChoice.getSelectedIndex()];
        canvas.setFilledColor(color);
    }
 
    /**
     * the main method
     */
    public static void main(String[] argv) {
        // Create a frame
        Draw frame = new Draw();
        frame.setSize(WIDTH, HEIGHT);
        frame.setLocation(150, 100);
 
        // add window closing listener
        frame.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent event) {
                System.exit(0);
            }
        });
 
        // Show the frame
        frame.setVisible(true);
    }
}

Second Part

/******************************************************************
 *  COURSE:             CSC231 Computer Science and Programming II
 *	Lab:			    Number 4
 *	FILE:				DrawCanvas.java
 *	TARGET:				Java 5.0 and 6.0
 *****************************************************************/
 
// Import Core Java packages
import java.awt.*;
import java.awt.event.*;
 
public class DrawCanvas extends Canvas implements MouseListener,
                                                  MouseMotionListener {
 
    // Constants for shapes
    public static final int CIRCLE = 1;
    public static final int ROUNDED_RECTANGLE = 2;
    public static final int RECTANGLE_3D = 3;
    public static final int SQUARE = 4;
    public static final int OVAL = 5;
    public static final int LINE = 6;
 
    // Coordinates of points to draw
    private int x1, y1, x2, y2;
 
    // shape to draw
    private int shape = CIRCLE;
    /**
     * Method to set the shape
     */
    public void setShape(int shape) {
        this.shape = shape;
    }
 
    // filled color
    private Color filledColor = null;
    /**
     * Method to set filled color
     */
    public void setFilledColor(Color color) {
        filledColor = color;
    }
 
    /**
     * Constructor
     */
	public DrawCanvas() {
	    addMouseListener(this);
	    addMouseMotionListener(this);
	} // end of constructor
 
    /**
     * painting the component
     */
    public void paint(Graphics g) {
 
        // the drawing area
        int x, y, width, height;
 
        // determine the upper-left corner of bounding rectangle
        x = Math.min(x1, x2);
        y = Math.min(y1, y2);
 
        // determine the width and height of bounding rectangle
        width = Math.abs(x1 - x2);
        height = Math.abs(y1 - y2);
 
        if(filledColor != null)
            g.setColor(filledColor);
        switch (shape) {
            case ROUNDED_RECTANGLE :
                if(filledColor == null)
                    g.drawRoundRect(x, y, width, height, width/4, height/4);
                else
                    g.fillRoundRect(x, y, width, height, width/4, height/4);
                break;
            case CIRCLE :
                int diameter = Math.max(width, height);
                if(filledColor == null)
                    g.drawOval(x, y, diameter, diameter);
                else
                    g.fillOval(x, y, diameter, diameter);
                break;
            case RECTANGLE_3D :
                if(filledColor == null)
                    g.draw3DRect(x, y, width, height, true);
                else
                    g.fill3DRect(x, y, width, height, true);
                break;
        }
    }
 
    /**
     * Implementing MouseListener
     */
    public void mousePressed(MouseEvent event) {
        x1 = event.getX();
        y1 = event.getY();
    }
 
    public void mouseReleased(MouseEvent event) {
        x2 = event.getX();
        y2 = event.getY();
        repaint();
    }
 
    public void mouseClicked(MouseEvent e) {}
    public void mouseEntered(MouseEvent e) {}
    public void mouseExited(MouseEvent e) {}
 
    /**
     * Implementing MouseMotionListener
     */
    public void mouseDragged(MouseEvent event) {
        x2 = event.getX();
        y2 = event.getY();
        repaint();
    }
 
    public void mouseMoved(MouseEvent e) {}
}