code:   import java.awt.*;
    import java.awt.event.*;
    import java.awt.geom.*;
    import javax.swing.JApplet;
    import javax.swing.JFrame;
    public class Plot2d extends JApplet {
      double[] xi;
      double[] yi;
      public Plot2d(double[] x, double[] y) {
          this.xi = x;
          this.yi = y;
      }
      public static double max(double[] t) {
          double maximum = t[0];
          for (int i = 1; i < t.length; i++) {
              if (t[i] > maximum) {
                  maximum = t[i];
              }
          }
          return maximum;
      }
      public static double min(double[] t) {
          double minimum = t[0];
          for (int i = 1; i < t.length; i++) {
              if (t[i] < minimum) {
                  minimum = t[i];
              }
          }
          return minimum;
      }
      public void init() {
          setBackground(Color.white);
          setForeground(Color.white);
      }
      public void paint(Graphics g) {
          Graphics2D g2 = (Graphics2D) g;
          g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
                  RenderingHints.VALUE_ANTIALIAS_ON);
          g2.setPaint(Color.black);
          int x0 = 70;
          int y0 = 10;
          int xm = 670;
          int ym = 410;
          int xspan = xm - x0;
          int yspan = ym - y0;
          double xmax = max(xi);
          double xmin = min(xi);
          double ymax = max(yi);
          double ymin = min(yi);
          g2.draw(new Line2D.Double(x0, ym, xm, ym));
          g2.draw(new Line2D.Double(x0, ym, x0, y0));
          for (int j = 0; j < 5; j++) {
              int interv = 4;
              g2.drawString("" + (j * (xmax - xmin) / interv + xmin), j * xspan / interv + x0 - 10, ym + 20);
              g2.drawString("" + (j * (ymax - ymin) / interv + ymin), x0 - 20 - (int) (9 * Math.log10(ymax)),
   ym - j * yspan / interv + y0 - 5);
              g2.draw(new Line2D.Double(j * xspan / interv + x0, ym, j * xspan / interv + x0, ym + 5));
              g2.draw(new Line2D.Double(x0 - 5, j * yspan / interv + y0, x0, j * yspan / interv + y0));
          }
          for (int i = 0; i < xi.length; i++) {
              int f = (int) ((xi[i] - xmin) * xspan / (xmax - xmin));
              int h = (int) (((ymax - ymin) - (yi[i] - ymin)) * yspan / (ymax - ymin));
              g2.drawString("o", x0 + f - 3, h + 14);
          }
          for (int i = 0; i < xi.length - 1; i++) {
              int f = (int) ((xi[i] - xmin) * xspan / (xmax - xmin));
              int f2 = (int) ((xi[i + 1] - xmin) * xspan / (xmax - xmin));
              int h = (int) (((ymax - ymin) - (yi[i] - ymin)) * yspan / (ymax - ymin));
              int h2 = (int) (((ymax - ymin) - (yi[i + 1] - ymin)) * yspan / (ymax - ymin));
              g2.draw(new Line2D.Double(f + x0, h + y0, f2 + x0, h2 + y0));
          }
      }
      public static void main(String args[]) {
          JFrame f = new JFrame("ShapesDemo2D");
          f.addWindowListener(new WindowAdapter() {
              public void windowClosing(WindowEvent e) {
                  System.exit(0);
              }
          });
          double[] r = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
          double[] t = {2.7, 2.8, 31.4, 38.1, 58.0, 76.2, 100.5, 130.0, 149.3, 180.09};
          JApplet applet = new Plot2d(r, t);
          f.getContentPane().add("Center", applet);
          applet.init();
          f.pack();
          f.setSize(new Dimension(720, 480));
          f.show();
      }
    }
  