我正在做家谱，这是我的问题。我有屏幕NewFamilyTree.java和NewPerson.java。
NewFamilyTree.java：
public class NewFamilyTree {
...
private void initialize() {
frame = new JFrame();
frame.setTitle("New family tree");
frame.setBounds(100, 100, 906, 569);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
...
JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
frame.getContentPane().add(tabbedPane, BorderLayout.CENTER);
JScrollPane scrollPane = new JScrollPane();
tabbedPane.addTab("Tree", null, scrollPane, null);
panel_1 = new JPanel();
scrollPane.setViewportView(panel_1);
panel_1.setLayout(new MigLayout("", "[][][][][][][][]", "[][][][][][]"));
NewPerson.java：
public class NewPerson{
...
buttonAdd = new JButton("Add");
buttonAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String names = textFieldNames.getText();
String dateBirth = textFieldDateOfBirth.getText();
String bio = textAreaBio.getText();
Data newData = new Data(names, dateBirth, bio, fileID);
//code that puts new label on scrollpane from NewFamilyTree.java
}
});
buttonAdd.setBackground(new Color(30, 144, 255));
frame.getContentPane().add(buttonAdd, "cell 2 6,grow");
}
我需要通过按
new JLabel的class NewPerson上的添加按钮，将JScrollPane从NewFamilytree.java放入。希望有人可以提供帮助，我进行了很多搜索，但也无济于事。编辑：@mjr的答案后。
我在
public JPanel panel_1;中添加了NewFamilyTree。在执行的Add操作中，我添加了：JLabel lblHomer = new JLabel("Homer");
lblHomer.setIcon(new ImageIcon("C:\\Users\\Tinmar\\Desktop\\HomerSimpson3.gif"));
panel_1.add(lblHomer, "cell 7 5");
没有错误，但是-按添加按钮后没有任何反应。我还添加了
NewPerson EXTENDS NewFamilyTree，ofc。 最佳答案
NewPerson不需要从NewFamilyTree扩展，也没有向类添加任何功能
代替在JFrame中使用NewPerson，可以考虑使用模式JDialog。有关更多详细信息，请参见How to Make Dialogs
限制类之间组件的暴露。没有理由为什么NewFamilyTree应该能够访问NewPerson使用的“窗口”。没有理由为什么NewPerson应该向NewFamilyTree添加任何内容
不要将重量较大的成分（例如java.awt.Button）与重量较轻的成分混合使用，这样就不会导致问题的终结。
您需要改变思维方式。不用让NewPerson更新NewFamilyTree的UI，而是让NewPerson从用户那里收集详细信息，并将此信息传递回NewFamilyTree，以便它可以使用...
例如...
JButton newPersonButton = new JButton("New Person");
newPersonButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
Data data = NewPerson.createPerson(frame);
if (data != null) {
JLabel lblHomer = new JLabel(data.names);
panel_1.add(lblHomer, "cell 7 5");
panel_1.revalidate();
}
}
});
这基本上使用了
static方法createPerson，该方法传回Data的实例（如果用户取消了操作，则传回null），然后NewFamilyTree可以使用该实例。它使代码解耦，因为NewPerson不依赖NewFamilyTree中的任何内容，并且NewFamilyTree保持控制。这清楚地定义了两个类之间的职责范围，也意味着可以从任何地方调用NewPerson。createPerson方法看起来像这样...public static Data createPerson(Component comp) {
NewPerson newPerson = new NewPerson();
Window win = SwingUtilities.getWindowAncestor(comp);
JDialog dialog = null;
if (win instanceof Frame) {
dialog = new JDialog((Frame) win, "New person", true);
} else if (win instanceof Dialog) {
dialog = new JDialog((Dialog) win, "New person", true);
} else {
dialog = new JDialog((Frame) null, "New person", true);
}
newPerson.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source instanceof Component) {
Window win = SwingUtilities.getWindowAncestor((Component) source);
win.dispose();
}
}
});
dialog.add(newPerson);
dialog.setVisible(true);
return newPerson.getData();
}
它基本上创建
JDialog的实例，将其显示给用户并等待，直到NewPerson类触发ActionEvent，它用于处理对话框。然后它向NewPerson实例询问数据...而且由于没有提到很多功能，因此这里有一个完全可运行的示例...
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Component;
import java.awt.Dialog;
import java.awt.EventQueue;
import java.awt.Frame;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextArea;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
import net.miginfocom.swing.MigLayout;
public class NewFamilyTree {
private JFrame frame;
private JPanel panel_1;
private JScrollPane scrollPane;
private JTabbedPane tabbedPane;
/**
* Launch the application.
*/
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
NewFamilyTree window = new NewFamilyTree();
window.frame.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
/**
* Create the application.
*/
public NewFamilyTree() {
initialize();
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
frame = new JFrame();
frame.setTitle("New family tree");
frame.getContentPane().setBackground(new Color(135, 206, 250));
frame.setBounds(100, 100, 906, 569);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel();
panel.setBackground(new Color(30, 144, 255));
frame.getContentPane().add(panel, BorderLayout.EAST);
panel.setLayout(new MigLayout("", "[]", "[][][][][][][][]"));
JButton newPersonButton = new JButton("New Person");
newPersonButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
Data data = NewPerson.createPerson(frame);
if (data != null) {
JLabel lblHomer = new JLabel(data.names);
// lblHomer.setIcon(new ImageIcon("C:\\Users\\Tinmar\\Desktop\\HomerSimpson3.gif"));
panel_1.add(lblHomer, "cell 7 5");
panel_1.revalidate();
}
}
});
panel.add(newPersonButton, "cell 0 5");
JButton btnNewButton_1 = new JButton("New button");
panel.add(btnNewButton_1, "cell 0 6");
tabbedPane = new JTabbedPane(JTabbedPane.TOP);
frame.getContentPane().add(tabbedPane, BorderLayout.CENTER);
scrollPane = new JScrollPane();
tabbedPane.addTab("Tree", null, scrollPane, null);
panel_1 = new JPanel();
scrollPane.setViewportView(panel_1);
panel_1.setLayout(new MigLayout("", "[][][][][][][][]", "[][][][][][]"));
// JLabel lblHomer = new JLabel("Homer");
// lblHomer.setIcon(new ImageIcon("C:\\Users\\Tinmar\\Desktop\\HomerSimpson3.gif"));
// panel_1.add(lblHomer, "cell 7 5");
JScrollPane scrollPane_1 = new JScrollPane();
tabbedPane.addTab("Info", null, scrollPane_1, null);
frame.repaint();
}
//
// /**
// * Launch the application.
// */
// public static void main(String[] args) {
// EventQueue.invokeLater(new Runnable() {
// public void run() {
// try {
// NewPerson window = new NewPerson();
// window.frame.setVisible(true);
// } catch (Exception e) {
// e.printStackTrace();
// }
// }
// });
// }
public static class NewPerson extends JPanel {
private JTextField textFieldNames;
private JButton selectPictureButton;
private JLabel labelDateOfBirth;
private JTextField textFieldDateOfBirth;
private JLabel labelShortBio;
private JTextArea textAreaBio;
private JLabel labelSelectPicture;
private JButton buttonAdd;
private String fileID;
private Data data;
/**
* Create the application.
*/
private NewPerson() {
initialize();
}
public static Data createPerson(Component comp) {
NewPerson newPerson = new NewPerson();
Window win = SwingUtilities.getWindowAncestor(comp);
JDialog dialog = null;
if (win instanceof Frame) {
dialog = new JDialog((Frame) win, "New person", true);
} else if (win instanceof Dialog) {
dialog = new JDialog((Dialog) win, "New person", true);
} else {
dialog = new JDialog((Frame) null, "New person", true);
}
newPerson.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if (source instanceof Component) {
Window win = SwingUtilities.getWindowAncestor((Component) source);
win.dispose();
}
}
});
dialog.add(newPerson);
dialog.pack();
dialog.setLocationRelativeTo(comp);
dialog.setVisible(true);
return newPerson.getData();
}
public void addActionListener(ActionListener listener) {
listenerList.add(ActionListener.class, listener);
}
protected void fireActionPerformed() {
ActionListener[] listeners = listenerList.getListeners(ActionListener.class);
if (listeners != null && listeners.length > 0) {
ActionEvent evt = new ActionEvent(this, ActionEvent.ACTION_PERFORMED, "created");
for (ActionListener listener : listeners) {
listener.actionPerformed(evt);
}
}
}
public Data getData() {
return data;
}
/**
* Initialize the contents of the frame.
*/
private void initialize() {
setBackground(new Color(135, 206, 250));
setLayout(new MigLayout("", "[][][grow]", "[][][][grow][][][]"));
JLabel labelNames = new JLabel("Name and Surname:");
add(labelNames, "cell 1 1,alignx trailing");
textFieldNames = new JTextField();
add(textFieldNames, "cell 2 1,growx");
textFieldNames.setColumns(10);
labelDateOfBirth = new JLabel("Date of birth:");
add(labelDateOfBirth, "cell 1 2,alignx center,aligny center");
textFieldDateOfBirth = new JTextField();
add(textFieldDateOfBirth, "cell 2 2,growx");
textFieldDateOfBirth.setColumns(10);
labelShortBio = new JLabel("Bio:");
add(labelShortBio, "cell 1 3,alignx center,aligny center");
textAreaBio = new JTextArea();
add(textAreaBio, "cell 2 3,grow");
labelSelectPicture = new JLabel("Select picture:");
add(labelSelectPicture, "cell 1 4,alignx center,aligny center");
selectPictureButton = new JButton("...");
selectPictureButton.setBackground(new Color(30, 144, 255));
selectPictureButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
JFileChooser chooser = new JFileChooser(new File(System.getProperty("user.home") + "\\Desktop"));
chooser.setDialogTitle("Select Location");
chooser.setFileSelectionMode(JFileChooser.APPROVE_OPTION);
chooser.setAcceptAllFileFilterUsed(false);
if (chooser.showSaveDialog(null) == JFileChooser.APPROVE_OPTION) {
fileID = chooser.getSelectedFile().getPath();
// txtField.setText(fileID);
}
}
});
add(selectPictureButton, "cell 2 4");
buttonAdd = new JButton("Add");
buttonAdd.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
String names = textFieldNames.getText();
String dateBirth = textFieldDateOfBirth.getText();
String bio = textAreaBio.getText();
data = new Data(names, dateBirth, bio, fileID);
fireActionPerformed();
}
});
buttonAdd.setBackground(new Color(30, 144, 255));
add(buttonAdd, "cell 2 6,grow");
}
}
public static class Data {
private final String names;
private final String dateBirth;
private final String bio;
private final String fileID;
private Data(String names, String dateBirth, String bio, String fileID) {
this.names = names;
this.dateBirth = dateBirth;
this.bio = bio;
this.fileID = fileID;
}
}
}
不要依赖
static提供跨类的功能。如果您需要其他课程提供的知识，请将其作为参考。 static不是您的朋友，您应该小心并小心使用它不要在没有充分理由的情况下公开类的字段，请依靠
interface允许类提供或获取信息。这限制了其他类可以做什么。分离和隔离责任
看看How to Use Trees