Java Source Code for Normal Minus Cauchy Probability Density

import java.applet.*;
import java.awt.*;
import java.util.Random;

class CauchyPlot extends Canvas {

        private int max_iterations = 400;

        private void plot(Graphics g, int x, int y, int y0, int plotColor) {
                
                if (y0>y) g.setColor(Color.blue);
                     else g.setColor(Color.red);
                g.drawLine(x, y, x, y0);
        }

        public void paint(Graphics g) {

            double xbegin=-10., xend=10., xincr, x1, y1, y2;
            int iter, xplot, yplot, yplot2, plotColor=0;

            xincr = (xend-xbegin)/max_iterations;
            x1 = xbegin;
        
            for (iter=0;iter<=max_iterations;iter++) {

			//cauchy density
                        y1 = x1*x1;
			y1 = y1+1.0;
			y1 = 3.1415926535897932*y1;
			y1 = 1.0/y1;

			//normal density
			y2 = -x1*x1/2.0;
			y2 = java.lang.Math.exp(y2);
			y2 = y2*.39894228;

              xplot = 210+(int)(20*x1);
      	      yplot = 410-(int)(1000*y1);
              yplot2 = 410-(int)(1000*y2);
              plot(g,xplot,yplot2,yplot,plotColor);
              x1 = x1+xincr;
              }
        }
        } 

        public class Cauchy extends Applet {

                private CauchyPlot canvas;

                public boolean handleEvent(Event e) {
                        if(e.id==Event.WINDOW_DESTROY) System.exit(0);
                        return super.handleEvent(e);
                }
                
                public void init() {

                        setLayout(new BorderLayout());
                        canvas = new CauchyPlot();
                        add("Center", canvas);
                        }

        }