Java Swing - Generate JTable model by using JavaBean properties and reflection

In the following example, the TableModel will be created automatically by using the JavaBean properties of the provided object and Java reflection.

Creating the TableModel

public class TableModelCreator {

  public static <T> TableModel createTableModel(Class<T> beanClass, List<T> list) {
      try {
          BeanInfo beanInfo = Introspector.getBeanInfo(beanClass);
          List<String> columns = new ArrayList<>();
          List<Method> getters = new ArrayList<>();

          for (PropertyDescriptor pd : beanInfo.getPropertyDescriptors()) {
              String name = pd.getName();
              if (name.equals("class")) {
                  continue;
              }
              name = Character.toUpperCase(name.charAt(0)) + name.substring(1);
              String[] s = name.split("(?=\\p{Upper})");
              String displayName = "";
              for (String s1 : s) {
                  displayName += s1 + " ";
              }

              columns.add(displayName);
              Method m = pd.getReadMethod();
              getters.add(m);
          }

          TableModel model = new AbstractTableModel() {
              @Override
              public String getColumnName(int column) {
                  return columns.get(column);
              }

              @Override
              public int getRowCount() {
                  return list.size();
              }

              @Override
              public int getColumnCount() {
                  return columns.size();
              }

              @Override
              public Object getValueAt(int rowIndex, int columnIndex) {
                  try {
                      return getters.get(columnIndex).invoke(list.get(rowIndex));
                  } catch (Exception e) {
                      throw new RuntimeException(e);
                  }
              }
          };
          return model;

      } catch (Exception e) {
          throw new RuntimeException(e);
      }
  }
}

The example Java Bean

public class Employee {
  private String name;
  private String dept;
  private String phone;
  private String cellPhone;
    .............
}

The main class

public class ExampleMain {
  public static void main(String[] args) {
      JFrame frame = createFrame();
      List<Employee> list = new ArrayList<>();
      for (int i = 1; i <= 30; i++) {
          Employee e = new Employee();
          e.setName("name" + i);
          e.setPhone("phone" + i);
          e.setDept("dept" + i);
          e.setCellPhone("cell" + i);

          list.add(e);
      }
      TableModel tableModel = TableModelCreator.createTableModel(Employee.class, list);
      JTable table = new JTable(tableModel);
      JScrollPane pane = new JScrollPane(table);
      frame.add(pane);
      frame.setLocationRelativeTo(null);
      frame.setVisible(true);
  }

  private static JFrame createFrame() {
      JFrame frame = new JFrame("JTable example");

      frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      frame.setSize(new Dimension(600, 300));
      return frame;
  }
}

Output

Example Project

Dependencies and Technologies Used:

• JDK 1.8
• Maven 3.3.9