dataframe.java

< ProJavaProgrammingSecondEdition> 书中例程源码

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class DataFrame extends JFrame {

  protected DataPanel panel = new DataPanel();

  public static void main(String[] args) {
    DataFrame df = new DataFrame();
    df.setVisible(true);
  }

  public DataFrame() {
    super("Enter Data");
    buildLayout();
    pack();
  }

  protected void buildLayout() {
    Container pane = getContentPane();
    pane.setLayout(new BorderLayout());
    pane.add(new DataPanel(), BorderLayout.CENTER);
    JButton button = new JButton("Ok");
    button.addActionListener(new ActionListener() {
      public void actionPerformed(ActionEvent event) {
        onOk();
      }
    }
    );
    JPanel panel = new JPanel();
    panel.setLayout(new FlowLayout(FlowLayout.CENTER, 0, 0));
    panel.add(button);
    pane.add(panel, BorderLayout.SOUTH);
  }

  protected void onOk() {
    try {
      panel.validateInput();
      System.exit(0);
    }
    catch (InputValidationException ive) {
      ive.errorSource.requestFocus();
      JOptionPane.showMessageDialog(this, ive.getMessage(),
                                    "Validation Error",
                                    JOptionPane.ERROR_MESSAGE);
    }
  }

}