JDK Frame内容区绘制边框

package taishan;
import java.awt.Color;
import java.awt.Graphics;
@SuppressWarnings("serial")
public abstract class RotateFontFrameAbstract extends TFrame
{
    private   final static int    FRAME_WIDTH  = 540;
    private   final static int    FRAME_HEIGHT = 480;
  private void drawFrameBorder(Graphics g)
  {
    int startX = 8;
    int startY = 31;
    int endX   = FRAME_WIDTH  - 9;
    int endY   = FRAME_HEIGHT - 9;
    g.setColor(COLOR_BORDER);
    g.drawLine(startX, startY, FRAME_WIDTH, startY);
    g.drawLine(startX, startY, startX,      FRAME_HEIGHT);
    g.drawLine(startX, endY,   endX,        endY);
    g.drawLine(endX,   startY, endX,        endY);
  }
  @Override
    public final void paint(Graphics g)
    {
    super.paint(g);
        drawFrameBorder();
    }
  protected final static void display(TFrame frame)
  {
        frame.setSize(FRAME_WIDTH, FRAME_HEIGHT);
        frame.setVisible(true);
  }
}