BorderLayout not working??

Question

here is the code i am having trouble with:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class JPaint extends JFrame{
    static Palette plt;
    /** Creates a new instance of JPaint */
    public JPaint() {
        super("JPaint");
        Container c = this.getContentPane();
        PaintPanel p = new PaintPanel();//create test panel to paint on
        plt = new Palette();//colour palette
        c.add(plt, BorderLayout.SOUTH);
        c.add(p, BorderLayout.CENTER);
    public static void main(String[] args){
        JPaint frm = new JPaint();
        frm.setSize(640, 480);
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frm.setVisible(true);
}for some reason the BorderLayout isn't working.
only the component placed in BorderLayout.CENTER is showing up.
when i switch the two components around, still only the one in CENTER shows up so i know it isnt to do with the component.
this has never happened before, whats going on?

Answer 1

Ok this really is as simple as i can make it:
Class: JPaint
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.border.*;
public class JPaint extends JFrame{
    Palette plt;
    /** Creates a new instance of JPaint */
    public JPaint() {
        super("JPaint");
        Container c = this.getContentPane();
        plt = new Palette();//colour palette
        PaintPanel p = new PaintPanel(plt);//create test panel to paint on
        p.setBorder(new LineBorder(Color.GRAY, 1));
        c.add(plt, BorderLayout.SOUTH);
        c.add(p, BorderLayout.CENTER);
    public static void main(String[] args){
        JPaint frm = new JPaint();
        frm.setSize(640, 480);
        frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frm.setVisible(true);
}Class PaintPanel:
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class PaintPanel extends JPanel implements MouseMotionListener, MouseListener{
    int toolNum;
    int pointNum;
    int[] xPoints;
    int[] yPoints;
    Point point;
    int mouseButton;
    Palette plt;
    public PaintPanel(Palette plt) {
        this.plt = plt;
        toolNum = 0;
        mouseButton = 0;
        pointNum = 0;
        xPoints = new int[1000];//array of ypoints and xpoints for freehand lines
        yPoints = new int[1000];
        addMouseListener(this);//add listeners
        addMouseMotionListener(this);
    public void mouseMoved(MouseEvent e){
    public void mouseDragged(MouseEvent e){
        point = e.getPoint();
        if(SwingUtilities.isLeftMouseButton(e)){
            mouseButton = 0;
        } else{
            mouseButton = 1;
        if(toolNum == 0) {//freehand line
            try{
                xPoints[pointNum] = point.x;//add this point to xpoints/ypoints
                yPoints[pointNum] = point.y;
                pointNum++;//add 1 to number of points
            } catch(ArrayIndexOutOfBoundsException ex){//if exceeds 1000 points
                pointNum = pointNum-1;
                mouseReleased(e);//call mouse released to reset
        repaint();
    public void mouseExited(MouseEvent e){
    public void mouseEntered(MouseEvent e){
    public void mouseReleased(MouseEvent e){
        if(toolNum == 0) {         
            pointNum = 0;//reset point nums, xpoints and ypoints
            xPoints = new int[1000];
            yPoints = new int[1000];
        repaint();
    public void mouseClicked(MouseEvent e){
    public void mousePressed(MouseEvent e){
    public void paintComponent(Graphics g){
        if(mouseButton ==0){
            g.setColor(plt.getCurrentColor());//for drawing while dragging
        } else{
            g.setColor(plt.getSecondColor());
        g.drawPolyline(xPoints, yPoints, pointNum);
}class: Palette
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.*;
public class Palette extends JPanel {
    Color current;//current colour
    Color secondary;
    JButton addButton, removeButton;
    JPanel gridPanel;
    public Palette(){
        current = Color.BLACK;
        secondary = Color.WHITE;
        gridPanel = new JPanel();
        gridPanel.setLayout(new GridLayout(2, 10));
        this.setLayout(null);
        this.setSize(100, 100);
        addButton = new JButton("Add");
        addButton.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
        int i = gridPanel.getComponentCount();
        addButton.setContentAreaFilled(false);
        removeButton = new JButton("Remove");
        removeButton.addActionListener(new ActionListener(){
            public void actionPerformed(ActionEvent e){
        removeButton.setContentAreaFilled(false);
        resizeGrid();
        gridPanel.setLocation(20, 5);
        addButton.setSize(80, 15);
        addButton.setLocation(20, 35);
        removeButton.setSize(100, 15);
        removeButton.setLocation(100, 35);
        add(gridPanel);
        add(addButton);
        add(removeButton);
    public void setCurrentColor(Color c){
        current = c;
    public Color getCurrentColor(){
        return current;
    public void setSecondColor(Color c){
        secondary = c;
    public Color getSecondColor(){
        return secondary;
    public void resizeGrid(){
        int i = gridPanel.getComponentCount();
        if(i%2 == 0) {
            gridPanel.setSize((i/2)*15, 30);
        } else{
            gridPanel.setSize(((i+1)/2)*15, 30);
}