import javax.swing.*;import java.awt.*;/** * Title:        Graph<p> * Description:  Simple program to produce a graph for the book<p> * Copyright:    Copyright (c) Mark Watson<p> * Company:      <p> * @author Mark Watson * @version 1.0 */public class Graph extends JFrame {  GraphPanel jPanel1;  float [] data;  public Graph() {    try {      int size = 500;      data = new float[size];      float xmin = 0;      float xmax = 10;      for (int i=0; i<size; i++) {        float x = i;        x = xmin + x * (xmax - xmin) / (float)size;        if (i==190) System.out.println("x="+x);        float x1 = (float)Math.sin(x);        float x2 = (float)Math.sin(x * 0.4f);        float x3 = (float)Math.sin(x * 3.0f);        data[i] = x1 * x2 * x3;      }      jbInit();    }    catch(Exception e) {      e.printStackTrace();    }  }  public static void main(String[] args) {    Graph untitled11 = new Graph();  }  private void jbInit() throws Exception {    jPanel1 = new GraphPanel(data);    jPanel1.setBackground(Color.white);    this.setDefaultCloseOperation(3);    this.getContentPane().add(jPanel1, BorderLayout.CENTER);    setSize(550, 500);    jPanel1.setVisible(true);    setVisible(true);  }}