public int getBaseline(Component c,
    int width,
    int height) 
{
        if (width <  0 || height <  0) {
            throw new IllegalArgumentException(
                    "Width and height must be  >= 0");
        }
        return -1;
}

Returns the baseline. A return value less than 0 indicates the border does not have a reasonable baseline.

The default implementation returns -1. Subclasses that support baseline should override appropriately. If a value >= 0 is returned, then the component has a valid baseline for any size >= the minimum size and getBaselineResizeBehavior can be used to determine how the baseline changes with size.

 public Component.BaselineResizeBehavior getBaselineResizeBehavior(Component c) 
{
        if (c == null) {
            throw new NullPointerException("Component must be non-null");
        }
        return Component.BaselineResizeBehavior.OTHER;
}

Returns an enum indicating how the baseline of a component changes as the size changes. This method is primarily meant for layout managers and GUI builders.

The default implementation returns BaselineResizeBehavior.OTHER, subclasses that support baseline should override appropriately. Subclasses should never return null; if the baseline can not be calculated return BaselineResizeBehavior.OTHER. Callers should first ask for the baseline using getBaseline and if a value >= 0 is returned use this method. It is acceptable for this method to return a value other than BaselineResizeBehavior.OTHER even if getBaseline returns a value less than 0.

 public Insets getBorderInsets(Component c) 
{
        return getBorderInsets(c, new Insets(0, 0, 0, 0));
}

This default implementation returns a new Insets object that is initialized by the #getBorderInsets(Component,Insets) method. By default the {@code top}, {@code left}, {@code bottom}, and {@code right} fields are set to {@code 0}.

 public Insets getBorderInsets(Component c,
    Insets insets) 
{
        insets.left = insets.top = insets.right = insets.bottom = 0;
        return insets;
}

Reinitializes the insets parameter with this Border's current Insets.

 public Rectangle getInteriorRectangle(Component c,
    int x,
    int y,
    int width,
    int height) 
{
        return getInteriorRectangle(c, this, x, y, width, height);
}

This convenience method calls the static method.

 public static Rectangle getInteriorRectangle(Component c,
    Border b,
    int x,
    int y,
    int width,
    int height) 
{
        Insets insets;
        if(b != null)
            insets = b.getBorderInsets(c);
        else
            insets = new Insets(0, 0, 0, 0);
        return new Rectangle(x + insets.left,
                                    y + insets.top,
                                    width - insets.right - insets.left,
                                    height - insets.top - insets.bottom);
}

Returns a rectangle using the arguments minus the insets of the border. This is useful for determining the area that components should draw in that will not intersect the border.

 public boolean isBorderOpaque() 
{
 return false;
}

This default implementation returns false.

 static boolean isLeftToRight(Component c) 
{
        return c.getComponentOrientation().isLeftToRight();
}

 public  void paintBorder(Component c,
    Graphics g,
    int x,
    int y,
    int width,
    int height) 
{

}

This default implementation does no painting.