IndexOutOfBoundsException

[PorgrammingNoob117]

Ok so I'm trying to create a drawing program, and it was working fine until I got a random error, I can't find what I messed up and I keep getting an error at nt point1 = (pointList.get(k)); Here is my whole code:

class MyPanel extends JPanel {

    private int last_x;
    private int last_y;
    private int x;
    private int y;
    private Graphics g;
    private int radiusX;
    private int radiusY;
    private int click_x;
    private int click_y;
	private String mouseString;  
	
    public MyPanel(ArrayList pointList, ArrayList colorList, ArrayList eraserList, ArrayList overlapList, ArrayList rectangleList) 
    {
        setBorder(BorderFactory.createLineBorder(Color.black));
        this.pointList = pointList;
        this.colorList = colorList;
        this.eraserList = eraserList;
        this.overlapList = overlapList;
        this.rectangleList = rectangleList;
        defaultColor = new Color(238, 238, 238);
        mouseString = "default";
        addMouseListener(new MouseAdapter() 
        {
            public void mousePressed(MouseEvent e) 
            {
            	last_x = e.getX();
                last_y = e.getY();
               
            }
        }
        );

        addMouseMotionListener(new MouseAdapter() 
        {
            public void mouseDragged(MouseEvent e) 
            {
                x = e.getX();
                y = e.getY();
                mouseString = "Pressed";
                repaint();
            }
        }
        );
        addMouseMotionListener(new MouseAdapter() 
        {
            public void mouseRelease(MouseEvent e) 
            {
                mouseString = "Released";
            }
        }
        );
    }
    public Dimension getPreferredSize() 
    {
        return new Dimension(250,200);
    }
    protected void paintComponent(Graphics g)
    {
        super.paintComponent(g);
    	int k = 0;
    	int j = 0;
    	int n = 0;
    	int m = 0;
    	int p = 0;
    	String eraserString12 = (String) setEraser1();
		if (eraserString12.equals("Lines") && mouseString.equals("Pressed"))
    	{
			pointList.add(last_x);
	    	pointList.add(last_y);	
	       	pointList.add(x);	
	       	pointList.add(y);
	       	colorList.add(setColor1());
	       	overlapList.add(1);
		
    	}
    	else if (eraserString12.equals("Eraser") && mouseString.equals("Pressed"))
    	{
    		eraserList.add(last_x);
    		eraserList.add(last_y);
    		overlapList.add(2);
    	}
        setBackgroundColor();
        g.drawString("This is my custom Panel!",10,20);
        int overlapSize = (int) overlapList.size();
        last_x = x;
        last_y = y;
        while (m<overlapSize)
        {
        	int overlap = overlapList.get(m);
        	if (overlap==1)
            {
                System.out.println(pointList); 
        		int point1 = (pointList.get(k));
                 int point2 = ( pointList.get(k+1));
                 int point3 = (pointList.get(k+2));
                 int point4 = (pointList.get(k+3));
                 g.setColor(colorList.get(j));
                 g.drawLine(point1, point2, point3, point4);
                 g.setColor(defaultColor);
                 k = k+4;
                 j = j+1;
               
            }
            if (overlap==2)	
           	{
            	int circleX = eraserList.get(n);
            	int circleY = eraserList.get(n+1);
            	Color a = ColorBox.getBackground1();
            	if (a==Color.darkGray)
            	{
            		g.setColor(defaultColor);
            	}
            	else if (a!=Color.darkGray)
            	{
            		g.setColor(a);
            	}
            	g.fillOval(circleX-15, circleY-15, 30, 30);
                n = n+2;
            }
        }

            m++;
    }
        
    
    public Color setColor1()
    {
    	Color color = ColorBox.getColor();
    	return color;
    }
    public void setBackgroundColor()
    { 
    	Color a = ColorBox.getBackground1();
    	if (a==Color.darkGray)
    	{
    		setBackground(defaultColor);
    	}
    	else if (a!=Color.darkGray)
    	{
    		setBackground(a);
    	}
    }
    public String setEraser1()
    {
    	String eraserString = ColorBox.getEraser1();
    	return eraserString;
    }
   public void Clear()
   {
	   pointList.clear();
	   colorList.clear();
	   eraserList.clear();
	   overlapList.clear();
	   rectangleList.clear();
	   ColorBox.setBackgroundDefault();
	   setBackground(defaultColor);
	   repaint();
   }
    private ArrayList<Integer> pointList;
    private ArrayList<Color> colorList;
    private ArrayList<Integer> eraserList;
	private ArrayList<Integer> overlapList;
    private ArrayList<Integer> rectangleList;
	private Color defaultColor;
}

The ArrayList is 4 by 4, yet the error states:

Exception in thread "AWT-EventQueue-0" java.lang.IndexOutOfBoundsException: Index: 4, Size: 4
	at java.util.ArrayList.RangeCheck(Unknown Source)
	at java.util.ArrayList.get(Unknown Source)
	at MyPanel.paintComponent(Scribble.java:137)
	at javax.swing.JComponent.paint(Unknown Source)
	at javax.swing.JComponent.paintToOffscreen(Unknown Source)
	at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(Unknown Source)
	at javax.swing.RepaintManager$PaintManager.paint(Unknown Source)
	at javax.swing.RepaintManager.paint(Unknown Source)
	at javax.swing.JComponent._paintImmediately(Unknown Source)
	at javax.swing.JComponent.paintImmediately(Unknown Source)
	at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
	at javax.swing.RepaintManager.paintDirtyRegions(Unknown Source)
	at javax.swing.RepaintManager.seqPaintDirtyRegions(Unknown Source)
	at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(Unknown Source)
	at java.awt.event.InvocationEvent.dispatch(Unknown Source)
	at java.awt.EventQueue.dispatchEventImpl(Unknown Source)
	at java.awt.EventQueue.access$000(Unknown Source)
	at java.awt.EventQueue$1.run(Unknown Source)
	at java.awt.EventQueue$1.run(Unknown Source)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.security.AccessControlContext$1.doIntersectionPrivilege(Unknown Source)
	at java.awt.EventQueue.dispatchEvent(Unknown Source)
	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
	at java.awt.EventDispatchThread.run(Unknown Source)

So I'm stuck, any suggestions/tips?

[Fubarable]

Your error is not random at all -- you're trying to get an item out of an array list that is beyond the size of the array list. In that loop you check the value of m but don't check whether or not k or k+3 is < the size of the pointList.

There are other poblems with your code including trying to do program logic from within a paint/paintComonent method.

[PorgrammingNoob117]

Nevermind, m++ statement was out of while loop, of course i figure this out after I post...