import java.awt.*;import java.io.*;abstract class Module {  int xsiz, ysiz;  double weight;  double[] probs;  public Module(int xSiz, int ySiz, double w) {    xsiz = xSiz;    ysiz = ySiz;    weight = w;    randomKernel(w);  }  public void setweight(double w) {	weight = w;  }  public abstract void randomKernel(double w);    public abstract void paint(Graphics g, Database db);    public abstract double density(int x, int y);    public double[] calcp(Database db) {    int j, np;        np = db.nPoints();    probs = new double[np];    for(j = 0; j < np; j++) probs[j] = density(db.xVal(j), db.yVal(j));    return probs;  }  public void EMprob(double[] px, Database db) {    int np;    np = db.nPoints();    weight = 0;    for(int j = 0; j < np; j++) {      probs[j] /= px[j];      weight += probs[j];    }    weight /= np;  }    public abstract void EMpar(Database db, double prior);}