netbeans tablica i grafika

Witam mam problem. Kompletnie się nie znam na programowaniu, a za kilka godzin mam ostatnią poprawę kolokwium z informatyki mam do zrobienia zadanie, robię je od ok 10h i prawie nic mi nie wyszło. Czy ktoś jest jeszcze o tej porze na forum i mógłby mi podpowiedzieć jakiej komendy użyć, żeby wygenerować sume licz wyświetlanych w tabeli większych od 3a. i jak narycować taki rysunek. W załączniku jest cała treść. i tutaj dodam to co napisałam do tej pory. Bardzo prosze o jakieś wskazówki

import java.awt.Color;
import java.awt.Graphics;
import java.io.File;
import java.io.IOException;
import java.util.Random;
import java.util.Scanner;
import javax.swing.JOptionPane;
import javax.swing.JPanel;

//import javax.swing.*;

/*

• To change this template, choose Tools | Templates
• and open the template in the editor.
  */

/*

• Marta.java

• Created on 2011-06-09, 19:32:01
  /
  /*

• @Author Marta
  */
  public class Marta extends javax.swing.JFrame {

  Scanner we;
  PanelGraficzny p;
  Color kolor;

  /** Creates new form Marta */
  public Marta() {
  initComponents();

   p = new PanelGraficzny();
   p.setBackground(Color.white);
   p.setBounds(0, 170, 120, 120);
  

  }
  class PanelGraficzny extends JPanel {
  @Override
  protected void paintComponent (Graphics g) {
  kolor = new Color((int)(Math.random()*256), (int)(Math.random()*256), (int)(Math.random()*256));

       g.setColor(kolor);
       g.fillPolygon();
   }
  

  }
  /** This method is called from within the constructor to

  • initialize the form.

  • WARNING: Do NOT modify this code. The content of this method is

  • always regenerated by the Form Editor.
    */
    @SuppressWarnings("unchecked")
    // <editor-fold defaultstate="collapsed" desc="Generated Code">
    private void initComponents() {

    jScrollPane1 = new javax.swing.JScrollPane();
    jTable1 = new javax.swing.JTable();
    jLabel1 = new javax.swing.JLabel();
    jLabel2 = new javax.swing.JLabel();
    jTextField1 = new javax.swing.JTextField();
    jTextField2 = new javax.swing.JTextField();
    jMenuBar1 = new javax.swing.JMenuBar();
    jMenu1 = new javax.swing.JMenu();
    jMenuItem1 = new javax.swing.JMenuItem();
    jMenuItem2 = new javax.swing.JMenuItem();
    jMenuItem3 = new javax.swing.JMenuItem();

    setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

    jTable1.setModel(new javax.swing.table.DefaultTableModel(
    new Object [][] {
    {null, null, null, null, null},
    {null, null, null, null, null},
    {null, null, null, null, null},
    {null, null, null, null, null},
    {null, null, null, null, null}
    },
    new String [] {
    "A", "B", "C", "D", "E"
    }
    ) {
    Class[] types = new Class [] {
    java.lang.Integer.class, java.lang.Integer.class, java.lang.Integer.class, java.lang.Integer.class, java.lang.Integer.class
    };

     public Class getColumnClass(int columnIndex) {
         return types [columnIndex];
     }
    

    });
    jScrollPane1.setViewportView(jTable1);

    jLabel1.setText("jLabel1");

    jLabel2.setText("jLabel2");

    jTextField1.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    jTextField1ActionPerformed(evt);
    }
    });

    jTextField2.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    jTextField2ActionPerformed(evt);
    }
    });

    jMenu1.setText("Tabela");
    jMenu1.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    jMenu1ActionPerformed(evt);
    }
    });

    jMenuItem1.setText("Losuj");
    jMenuItem1.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    jMenuItem1ActionPerformed(evt);
    }
    });
    jMenu1.add(jMenuItem1);

    jMenuItem2.setText("Zapis");
    jMenuItem2.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    jMenuItem2ActionPerformed(evt);
    }
    });
    jMenu1.add(jMenuItem2);

    jMenuItem3.setText("Rysuj");
    jMenuItem3.addActionListener(new java.awt.event.ActionListener() {
    public void actionPerformed(java.awt.event.ActionEvent evt) {
    jMenuItem3ActionPerformed(evt);
    }
    });
    jMenu1.add(jMenuItem3);

    jMenuBar1.add(jMenu1);

    setJMenuBar(jMenuBar1);

    javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
    getContentPane().setLayout(layout);
    layout.setHorizontalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(layout.createSequentialGroup()
    .addGap(39, 39, 39)
    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addComponent(jScrollPane1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.PREFERRED_SIZE, 359, javax.swing.GroupLayout.PREFERRED_SIZE)
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 70, javax.swing.GroupLayout.PREFERRED_SIZE)
    .addGap(68, 68, 68)
    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, 72, javax.swing.GroupLayout.PREFERRED_SIZE))
    .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
    .addComponent(jLabel1)
    .addGap(101, 101, 101)
    .addComponent(jLabel2)
    .addGap(26, 26, 26)))
    .addContainerGap(78, Short.MAX_VALUE))
    );
    layout.setVerticalGroup(
    layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
    .addGroup(layout.createSequentialGroup()
    .addContainerGap()
    .addComponent(jScrollPane1, javax.swing.GroupLayout.PREFERRED_SIZE, 113, javax.swing.GroupLayout.PREFERRED_SIZE)
    .addGap(44, 44, 44)
    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
    .addComponent(jLabel1)
    .addComponent(jLabel2))
    .addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 50, Short.MAX_VALUE)
    .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
    .addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
    .addComponent(jTextField2, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
    .addGap(45, 45, 45))
    );

    pack();
    }// </editor-fold>

  private void jTextField2ActionPerformed(java.awt.event.ActionEvent evt) {
  // TODO add your handling code here:
  }

  private void jMenu1ActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:
}

private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) {
     int b = 0;
    Random r = new Random();
    try {
        int a = Integer.parseInt(jTextField1.getText());
        int n = a;
        int m = 5 * a;
        for (int i = 0; i < jTable1.getRowCount(); i++) {
            for (int j = 0; j < jTable1.getColumnCount(); j++) {
                b = a + r.nextInt(m - n + 1);
                jTable1.setValueAt(b, i, j);
            }

        }
        int z = 3*a;

         int suma = 0;
        
        for (int i = 0; i < (int)jTable1.getRowCount(); i++) {
            for (int j = 0; j < (int)jTable1.getColumnCount(); j++) {
                //if(z < (int)jTable1.getValueAt(i, j))  {
                //if(2>1) {
                   //
            }
            }
         jLabel1.setText("Suma wynosi" + " " + suma);
    } catch (Exception e) {
        JOptionPane.showMessageDialog(null, "Błąd danych");
    }   // TODO add your handling code here:
}

private void jMenuItem2ActionPerformed(java.awt.event.ActionEvent evt) {

int suma = 0;
try {
we = new Scanner(new File("dane83.txt"));
we.useDelimiter(" ");
while (we.hasNextInt()) {
suma = we.nextInt()*we.nextInt() ;
}
jTextField2.setText("" + suma);
} catch (IOException e) {
JOptionPane.showMessageDialog(this, e.getMessage());
} finally {
if (we != null) {
we.close();
}
}
}

private void jMenuItem3ActionPerformed(java.awt.event.ActionEvent evt) {
add(p);

p.setBackground(Color.white);
repaint(); // TODO add your handling code here:
}

private void jTextField1ActionPerformed(java.awt.event.ActionEvent evt) {
    // TODO add your handling code here:
}

/**
 * @param args the command line arguments
 */
public static void main(String args[]) {
    java.awt.EventQueue.invokeLater(new Runnable() {

        public void run() {
            new Marta().setVisible(true);
        }
    });
}
// Variables declaration - do not modify
private javax.swing.JLabel jLabel1;
private javax.swing.JLabel jLabel2;
private javax.swing.JMenu jMenu1;
private javax.swing.JMenuBar jMenuBar1;
private javax.swing.JMenuItem jMenuItem1;
private javax.swing.JMenuItem jMenuItem2;
private javax.swing.JMenuItem jMenuItem3;
private javax.swing.JScrollPane jScrollPane1;
private javax.swing.JTable jTable1;
private javax.swing.JTextField jTextField1;
private javax.swing.JTextField jTextField2;
// End of variables declaration

}