ПРИМЕР № 2

«Работа с табличными данными»

Исходный код примера:

package tsn.javase.demo02;
public class Form1 extends javax.swing.JFrame {
    public Form1() {
        initComponents();
    }
    @SuppressWarnings("unchecked")
    // //GEN-BEGIN:initComponents
    private void initComponents() {
        jScrollPane1 = new javax.swing.JScrollPane();
        jTable1 = new javax.swing.JTable();
        jButton1 = new javax.swing.JButton();
        jButton2 = new javax.swing.JButton();
        jLabel1 = new javax.swing.JLabel();
        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
        setTitle("Работа с табличными данными");
        setResizable(false);
        addWindowListener(new java.awt.event.WindowAdapter() {
            public void windowActivated(java.awt.event.WindowEvent evt) {
                this_windowActivated(evt);
            }
        });
        getContentPane().setLayout(null);
        jScrollPane1.setBorder(null);
        jScrollPane1.setToolTipText("");
        jTable1.setBorder(javax.swing.BorderFactory.createLineBorder(new java.awt.Color(0, 0, 0)));
        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}
            },
            new String [] {
                "Поле 1", "Поле 2", "Поле 3", "Поле 4"
            }
        ) {
            Class[] types = new 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];
            }
        });
        jTable1.setToolTipText("");
        jTable1.setCellSelectionEnabled(true);
        jTable1.setFillsViewportHeight(true);
        jTable1.setRowMargin(2);
        jScrollPane1.setViewportView(jTable1);
jTable1.getColumnModel().getSelectionModel().setSelectionMode(javax.swing.ListSelectionModel.SINGLE_INTERVAL_SELECTION);
        getContentPane().add(jScrollPane1);
        jScrollPane1.setBounds(18, 11, 198, 100);
        jButton1.setText("Случайные числа");
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });
        getContentPane().add(jButton1);
        jButton1.setBounds(234, 11, 121, 23);
        jButton2.setText("Сумма цифр");
        jButton2.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton2ActionPerformed(evt);
            }
        });
        getContentPane().add(jButton2);
        jButton2.setBounds(234, 52, 120, 23);
        jLabel1.setHorizontalAlignment(javax.swing.SwingConstants.CENTER);
        jLabel1.setText("jLabel1");
        getContentPane().add(jLabel1);
        jLabel1.setBounds(234, 81, 110, 14);
        setSize(new java.awt.Dimension(376, 155));
        setLocationRelativeTo(null);
    }// //GEN-END:initComponents
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
	//GEN-FIRST:event_jButton1ActionPerformed
        // Случайные числа
        long k;
        for (int i = 0; i < jTable1.getRowCount(); i++) {
            for (int j = 0; j < jTable1.getColumnCount(); j++) {
                k = Math.round(Math.random() * 10);
                jTable1.setValueAt(String.valueOf(k), i, j);
            }
        }
        jButton2ActionPerformed(null);
    }//GEN-LAST:event_jButton1ActionPerformed
    private void jButton2ActionPerformed(java.awt.event.ActionEvent evt) {
	//GEN-FIRST:event_jButton2ActionPerformed
        // Сумма цифр
        long s = 0;
        try {
            for (int i = 0; i < jTable1.getRowCount(); i++) {
                for (int j = 0; j < jTable1.getColumnCount(); j++) {
                    s += Integer.parseInt(jTable1.getValueAt(i, j).toString());
                }
            }
            jLabel1.setText(String.valueOf(s));
        } catch (Exception ee) {
            jLabel1.setText("Error");
        }
    }//GEN-LAST:event_jButton2ActionPerformed
    private void this_windowActivated(java.awt.event.WindowEvent evt) {
	//GEN-FIRST:event_this_windowActivated
        // Инициализация таблицы
        jScrollPane1.setColumnHeaderView(null); // Убрать заголовки колонок
        jScrollPane1.setRowHeaderView(null); // Убрать заголовки строк 
        for (int i = 0; i < jTable1.getColumnCount(); i++) {
            // Установка ширины столбцов
            jTable1.getColumnModel().getColumn(i).setMaxWidth(60);
        }
        for (int i = 0; i < jTable1.getRowCount(); i++) {
            for (int j = 0; j < jTable1.getColumnCount(); j++) {
                // Инициализация ячеек "0"
                jTable1.setValueAt("0", i, j);
            }
        }
        jButton1ActionPerformed(null); // Случайные числа
    }//GEN-LAST:event_this_windowActivated
 
    public static void main(String args[]) {
        /* Set the Nimbus look and feel */
        //
        /* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
         * For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
         */
        try {
            for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
                if ("Windows".equals(info.getName())) {
                    javax.swing.UIManager.setLookAndFeel(info.getClassName());
                    break;
                }
            }
        } catch (ClassNotFoundException ex) {
            java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Form1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        }
        //
 
        /* Create and display the form */
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                new Form1().setVisible(true);
            }
        });
    }
    // Variables declaration - do not modify//GEN-BEGIN:variables
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton2;
    private javax.swing.JLabel jLabel1;
    private javax.swing.JScrollPane jScrollPane1;
    private javax.swing.JTable jTable1;
    // End of variables declaration//GEN-END:variables
}