invoicepanel.java

Java程序设计技巧与开发实例附书源代码。

import java.awt.BorderLayout;
import java.awt.GridLayout;
import javax.swing.*;

public class InvoicePanel
    extends JPanel {
  protected JNumberField id = new JNumberField();
  protected JTextField desc = new JTextField();
  protected JNumberField price = new JNumberField();
  protected JNumberField num = new JNumberField();
  public InvoicePanel() {
    JPanel labels = new JPanel(new GridLayout(4, 1));
    labels.add(new JLabel(" ID "));
    labels.add(new JLabel(" Description "));
    labels.add(new JLabel(" Price "));
    labels.add(new JLabel(" Num Units"));
    JPanel inputs = new JPanel(new GridLayout(4, 1));
    inputs.add(id);
    inputs.add(desc);
    inputs.add(price);
    inputs.add(num);
    setLayout(new BorderLayout());
    add("West", labels);
    add("Center", inputs);
  }

  public Object[] getData() throws NumberFormatException {
    Object data[] = new Object[5];
    data[0] = new Integer(id.getInteger());
    data[1] = desc.getText();
    data[2] = new Double(price.getDouble());
    data[3] = new Integer(num.getInteger());
    data[4] = new Double(price.getDouble() * num.getInteger());
    return data;
  }

  public void setData(String[] data) {
    id.setText(data[0]);
    desc.setText(data[1]);
    price.setText(data[2]);
    num.setText(data[3]);
  }
}