我正在构建一个包含多个字段的 JPanel，但根据产品，这些字段可能会有所不同。
每个产品都有一些公共字段和一些特定字段。使用一些接口，可以对字段进行分组以使用所有需要的字段构建引用的 JPanel，如下所示：
public class VPNProduct extends JPanel implements VPNFields{
//use and positioning of the fields
}
interface VPNFields extends CommonFields{
//particular VPN fields
}
interface CommonFields{
//fields common to all products
}
我的问题是，有一些最佳实践或技术可以使它更容易或更井井有条，包括面板中字段的位置？
提前致谢。
有一些优雅的方法可以做到这一点。首先，一个接口将具有您的 get/set 方法，这些方法将访问您的字段。因此，您将有一个用于公共字段的接口和用于其他字段的其他接口。公共字段接口（因为它将被共享）应该实现为抽象类。这个抽象类将扩展 JPanel 并构建您的 JLabel、JComboBoxes ...等，并将它们布置在布局管理器中。
然后对于您需要添加更多字段的任何其他类，您将创建一个 Class 并让它扩展您的抽象类（所以现在它是一个 JPanel，所有公共字段都已经创建和布局）并使用您的额外实现一个接口字段。这些额外的字段您将必须创建它们的 Swing 组件并将它们添加到当前具有公共字段的布局管理器中。
如果您提供一些现场示例或向我们提供有关结构的提示，我可以起草一些代码示例以便您查看。
一个代码示例，显示可用于 Company 和 School 的公共字段，以及我们如何创建 2 个 JFrame，其表单均源自 1 个 JPanel 抽象类：
package stackoverflow.test;
public interface CommonFields {
public void setName(String name);
public void setLastName(String lastName);
public void setAge(int age);
public String getName();
public String getLastName();
public int getAge();
}
-
package stackoverflow.test;
public interface SchoolFields {
public void setSchoolName(String schoolName);
public void setGrade(int grade);
public void setHonorsProgram(boolean isHonors);
public String getSchoolName();
public int getGrade();
public boolean hasHonorsProgram();
}
-
package stackoverflow.test;
public interface CompanyFields {
public void setCompanyName(String companyName);
public void setJobTitle(String jobTitle);
public void setAddress(String address);
public String getCompanyName();
public String getJobTitle();
public String getAddress();
}
-
package stackoverflow.test;
import java.awt.GridLayout;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
public class AbstractJPanel extends JPanel implements CommonFields {
private static final long serialVersionUID = 150030761086805569L;
private JTextField nameField = null;
private JTextField lastNameField = null;
private JTextField ageField = null;
private JLabel nameLabel = null;
private JLabel lastNameLabel = null;
private JLabel ageLabel = null;
public AbstractJPanel() {
super(new GridLayout(0, 2));
nameField = new JTextField();
lastNameField = new JTextField();
ageField = new JTextField();
nameLabel = new JLabel("Name: ");
lastNameLabel =new JLabel("Last Name: ");
ageLabel = new JLabel("Age: ");
add(nameLabel);
add(nameField);
add(lastNameLabel);
add(lastNameField);
add(ageLabel);
add(ageField);
}
public void setName(String name) {
nameField.setText(name);
}
public void setLastName(String lastName) {
lastNameField.setText(lastName);
}
public void setAge(int age) {
ageField.setText(""+age);
}
public String getName() {
return nameField.getText();
}
public String getLastName() {
return lastNameField.getText();
}
public int getAge() {
return Integer.parseInt(ageField.getText());
}
}
-
package stackoverflow.test;
import javax.swing.JCheckBox;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class SchoolPanel extends AbstractJPanel implements SchoolFields {
private static final long serialVersionUID = -6201476099194804075L;
private JTextField schoolNameField = null;
private JTextField gradeField = null;
private JCheckBox honorsCheckBox = null;
private JLabel schoolNameLabel = null;
private JLabel gradeLabel = null;
private JLabel honorsLabel = null;
public SchoolPanel() {
super();
schoolNameLabel = new JLabel("School Name: ");
gradeLabel = new JLabel("Grade: ");
honorsLabel = new JLabel("Is Honors: ");
schoolNameField = new JTextField();
gradeField = new JTextField();
honorsCheckBox = new JCheckBox();
add(schoolNameLabel);
add(schoolNameField);
add(gradeLabel);
add(gradeField);
add(honorsLabel);
add(honorsCheckBox);
}
@Override
public void setSchoolName(String schoolName) {
schoolNameField.setText(schoolName);
}
@Override
public void setGrade(int grade) {
gradeField.setText(""+grade);
}
@Override
public void setHonorsProgram(boolean isHonors) {
honorsCheckBox.setSelected(isHonors);
}
@Override
public String getSchoolName() {
return schoolNameField.getText();
}
@Override
public int getGrade() {
return Integer.parseInt(gradeField.getText());
}
@Override
public boolean hasHonorsProgram() {
return honorsCheckBox.isSelected();
}
}
-
package stackoverflow.test;
import javax.swing.JLabel;
import javax.swing.JTextField;
public class CompanyPanel extends AbstractJPanel implements CompanyFields {
private static final long serialVersionUID = 7834845724312492112L;
private JTextField companyNameField = null;
private JTextField jobTitleField = null;
private JTextField addressField = null;
private JLabel companyNameLabel = null;
private JLabel jobTitleLabel = null;
private JLabel addressLabel = null;
public CompanyPanel() {
super();
companyNameLabel = new JLabel("Company Name: ");
jobTitleLabel = new JLabel("Job Title: ");
addressLabel = new JLabel("Address: ");
companyNameField = new JTextField();
jobTitleField = new JTextField();
addressField = new JTextField();
super.add(companyNameLabel);
super.add(companyNameField);
super.add(jobTitleLabel);
super.add(jobTitleField);
super.add(addressLabel);
super.add(addressField);
}
@Override
public void setCompanyName(String companyName) {
companyNameField.setText(companyName);
}
@Override
public void setJobTitle(String jobTitle) {
jobTitleField.setText(jobTitle);
}
@Override
public void setAddress(String address) {
addressField.setText(address);
}
@Override
public String getCompanyName() {
return companyNameField.getText();
}
@Override
public String getJobTitle() {
return jobTitleField.getText();
}
@Override
public String getAddress() {
return addressField.getText();
}
}
-
package stackoverflow.test;
import java.awt.BorderLayout;
import javax.swing.JFrame;
public class MainClass {
public MainClass() {
JFrame frame1 = new JFrame();
frame1.setLayout(new BorderLayout());
frame1.add(new CompanyPanel());
frame1.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame1.setSize(500, 500);
frame1.setVisible(true);
JFrame frame2 = new JFrame();
frame2.setLayout(new BorderLayout());
frame2.add(new SchoolPanel());
frame2.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame2.setSize(500, 500);
frame2.setVisible(true);
}
public static final void main(String ... args) {
new MainClass();
}
}
想的不是很好，因为我不知道你用的是什么类型的字段，所以做了一些虚构的字段JLabels，看看。我希望这能很好地解释我试图从我身边提供的东西，以及你可以看到的一个小方向:-)
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class Products
{
private JComboBox productBox;
private String[] productNames;
private JLabel imageLabel;
private Icon desktopIcon = UIManager.getIcon("OptionPane.informationIcon");
private Icon keyboardIcon = UIManager.getIcon("OptionPane.errorIcon");
private Icon mouseIcon = UIManager.getIcon("OptionPane.warningIcon");
private MainPanel mainPanel;
private JPanel fieldPanel;
private AdditionalFields additional;
public Products()
{
productNames = new String[]{
"Desktop",
"Keyboard",
"Mouse"
};
}
private void createAndDisplayGUI()
{
JFrame frame = new JFrame("Products");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
imageLabel = new JLabel();
JPanel contentPane = new JPanel();
contentPane.setOpaque(true);
contentPane.setBackground(Color.WHITE);
contentPane.setBorder(
BorderFactory.createTitledBorder(
"Products : "));
contentPane.setLayout(new GridLayout(0, 1, 2, 2));
contentPane.add(imageLabel);
fieldPanel = new JPanel();
fieldPanel.setOpaque(true);
fieldPanel.setBackground(Color.WHITE);
fieldPanel.setBorder(
BorderFactory.createEmptyBorder(
5, 5, 5, 5));
fieldPanel.setLayout(new GridLayout(0, 1, 2, 2));
productBox = new JComboBox(productNames);
productBox.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent ae)
{
JComboBox cbox = (JComboBox) ae.getSource();
String product = (String) cbox.getSelectedItem();
fieldPanel.removeAll();
if (product.equals("Desktop"))
{
mainPanel = new MainPanel("DESKTOP", "50000");
imageLabel.setIcon(desktopIcon);
fieldPanel.add(mainPanel);
fieldPanel.revalidate();
fieldPanel.repaint();
}
else if (product.equals("Keyboard"))
{
mainPanel = new MainPanel("Keyboard", "50");
additional = new AdditionalFields("Keyboard");
imageLabel.setIcon(keyboardIcon);
fieldPanel.add(mainPanel);
fieldPanel.add(additional);
fieldPanel.revalidate();
fieldPanel.repaint();
}
else if (product.equals("Mouse"))
{
mainPanel = new MainPanel("Mouse", "30");
additional = new AdditionalFields("Mouse");
imageLabel.setIcon(mouseIcon);
fieldPanel.add(mainPanel);
fieldPanel.add(additional);
fieldPanel.revalidate();
fieldPanel.repaint();
}
}
});
contentPane.add(fieldPanel);
frame.getContentPane().add(contentPane, BorderLayout.CENTER);
frame.getContentPane().add(productBox, BorderLayout.PAGE_END);
frame.setSize(300, 300);
frame.setLocationByPlatform(true);
frame.setVisible(true);
}
public static void main(String... args)
{
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
new Products().createAndDisplayGUI();
}
});
}
}
class MainPanel extends JPanel
{
private JLabel nameLabel;
private JLabel valueLabel;
private JTextField nameField;
private JTextField valueField;
public MainPanel(String name, String value)
{
setOpaque(true);
setBackground(Color.WHITE);
nameLabel = new JLabel("Name : ");
nameField = new JTextField(name, 10);
valueLabel = new JLabel("Value : ");
valueField = new JTextField(value, 10);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.FIRST_LINE_START;
gbc.weightx = 0.5;
gbc.fill = GridBagConstraints.NONE;
gbc.gridx = 0;
gbc.gridy = 0;
add(nameLabel, gbc);
gbc.gridx = 1;
gbc.gridy = 0;
add(nameField, gbc);
gbc.gridx = 0;
gbc.gridy = 1;
add(valueLabel, gbc);
gbc.gridx = 1;
gbc.gridy = 1;
add(valueField, gbc);
}
}
class AdditionalFields extends JPanel
{
private JLabel noOfButtons;
private JLabel noButField;
public AdditionalFields(String product)
{
setOpaque(true);
setBackground(Color.WHITE);
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.anchor = GridBagConstraints.FIRST_LINE_START;
gbc.weightx = 0.5;
gbc.fill = GridBagConstraints.NONE;
gbc.gridx = 0;
gbc.gridy = 0;
if (product.equals("Keyboard"))
{
noOfButtons = new JLabel(product);
noButField = new JLabel("110 KEYS", JLabel.CENTER);
}
else if (product.equals("Mouse"))
{
noOfButtons = new JLabel(product);
noButField = new JLabel("3 BUTTONS", JLabel.CENTER);
}
add(noOfButtons, gbc);
gbc.gridx = 1;
gbc.gridy = 0;
add(noButField, gbc);
}
}