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我在Java中做了一個簡單的GUI，其中包括一個菜單，上下文菜單，按鈕，工具欄，複選框和狀態欄。但是，按鈕和工具欄不顯示。這是代碼：對象不顯示在GUI中 - Java
import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.BorderFactory;
import javax.swing.BoxLayout;
import javax.swing.ImageIcon;
import javax.swing.JButton;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JPanel;
import javax.swing.JPopupMenu;
import javax.swing.JToolBar;
import javax.swing.KeyStroke;
import javax.swing.SwingUtilities;
import javax.swing.border.EtchedBorder;
public class test extends JFrame {
private JLabel statusbar;
private JPopupMenu menu;
private Toolkit toolkit;
public test() {
initUI();
}
private void initUI() {
JPanel panel = new JPanel();
panel.setLayout(new BoxLayout(panel, BoxLayout.Y_AXIS));
getContentPane().add(panel);
toolkit = this.getToolkit();
menu = new JPopupMenu();
JToolBar toolbar1 = new JToolBar();
JToolBar toolbar2 = new JToolBar();
ImageIcon iconNew = new ImageIcon(getClass().getResource("new.png")); // Icons
ImageIcon iconOpen = new ImageIcon(getClass().getResource("open.png"));
ImageIcon iconSave = new ImageIcon(getClass().getResource("save.png"));
ImageIcon iconExit = new ImageIcon(getClass().getResource("exit.png"));
JButton newb = new JButton(iconNew); // Declaring Buttons for Toolbar
JButton openb = new JButton(iconOpen);
JButton saveb = new JButton(iconSave);
JButton exitb = new JButton(iconExit);
toolbar1.add(newb); // Adding Buttons to Toolbar1
toolbar1.add(openb);
toolbar1.add(saveb);
toolbar1.setAlignmentX(0); // Alignment of Toolbar1
toolbar2.add(exitb); // Adding Buttons to Toolbar2
toolbar2.setAlignmentX(0); // Alignment of Toolbar2
exitb.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
});
panel.add(toolbar1);
panel.add(toolbar2);
add(panel, BorderLayout.NORTH);
JMenuBar menubar = new JMenuBar(); // JMenuBar
JMenu file = new JMenu("File");
JMenu view = new JMenu("View");
file.setMnemonic(KeyEvent.VK_F);
JMenuItem eMenuItem = new JMenuItem("Exit", iconExit); // Exit Menu Item
eMenuItem.setMnemonic(KeyEvent.VK_E);
eMenuItem.setToolTipText("Exit application");
eMenuItem.setAccelerator(KeyStroke.getKeyStroke(KeyEvent.VK_W,
ActionEvent.CTRL_MASK));
eMenuItem.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
});
JMenuItem nMenuItem = new JMenuItem("New", iconNew); // New Menu Item
nMenuItem.setToolTipText("New File");
JMenuItem oMenuItem = new JMenuItem("Open", iconOpen);
oMenuItem.setToolTipText("Open File");
JMenuItem sMenuItem = new JMenuItem("Save", iconSave);
sMenuItem.setToolTipText("Save File");
JMenu imp = new JMenu("Import..."); // Import Sub-Menu Item
imp.setMnemonic(KeyEvent.VK_M);
imp.setToolTipText("Import Data");
JMenuItem newsf = new JMenuItem("Import newsfeed list...");
JMenuItem bookm = new JMenuItem("Import bookmarks...");
JMenuItem mail = new JMenuItem("Import mail...");
imp.add(newsf); // Adding Sub-menu Items to Menu
imp.add(bookm);
imp.add(mail);
file.add(nMenuItem); // Adding Menu Items to "File" Menu-List
file.add(oMenuItem);
file.add(sMenuItem);
file.addSeparator();
file.add(imp);
file.addSeparator();
file.add(eMenuItem);
JButton quitButton = new JButton("Quit"); // Quit Button
quitButton.setBounds(870, 380, 80, 30);
quitButton.setToolTipText("Press me");
quitButton.setBackground(new Color(66, 89, 205));
quitButton.setForeground(new Color(255, 255, 255));
quitButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
});
JButton nextButton = new JButton("Next >"); // Next Button
nextButton.setBounds(770, 380, 80, 30);
nextButton.setToolTipText("Next...");
nextButton.setBackground(new Color(66, 89, 205));
nextButton.setForeground(new Color(255, 255, 255));
nextButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent event) {
System.exit(0);
}
});
panel.add(quitButton); // Adding Buttons to panel
panel.add(nextButton);
JCheckBoxMenuItem sbar = new JCheckBoxMenuItem("Show StatuBar"); // Creating
// Status-bar
// Check-box
sbar.setState(true);
sbar.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
if (statusbar.isVisible()) {
statusbar.setVisible(false);
} else {
statusbar.setVisible(true);
}
}
});
view.add(sbar); // Adding Check-box to the View Menu-List
JMenuItem menuItemBeep = new JMenuItem("Beep"); // Beep option in Pop-Up
menuItemBeep.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
toolkit.beep();
}
});
menubar.add(file); // Adding Menu-Lists to Menu Bar
menubar.add(view);
menu.add(menuItemBeep); // Adding Beep option in Pop-Up
JMenuItem menuItemClose = new JMenuItem("Close"); // Close option in
// Pop-Up
menuItemClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
System.exit(0);
}
});
menu.add(menuItemClose); // Adding Close option in Pop-Up
this.addMouseListener(new MouseAdapter() { // Mouse Listener for Pop-Up
@Override
public void mouseReleased(MouseEvent e) {
if (e.getButton() == MouseEvent.BUTTON3) {
menu.show(e.getComponent(), e.getX(), e.getY());
}
}
});
setJMenuBar(menubar); // Menu-bar???
statusbar = new JLabel(" Statusbar"); // Creating Status Bar
statusbar.setBorder(BorderFactory
.createEtchedBorder(EtchedBorder.RAISED));
add(statusbar, BorderLayout.SOUTH);
panel.setLayout(null); // Panel Design and additional Arguments
panel.setBackground(new Color(18, 33, 110));
this.setTitle("My First GUI in Java");
this.setSize(1000, 500);
this.setLocationRelativeTo(null);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
test ex = new test();
ex.setVisible(true);
}
});
}
}
我很新這個，所以任何意見表示讚賞。
謝謝！
您可能不應該擴展JFrame，並且您似乎要添加面板兩次。 –
你在哪裏調用'implements ActionListener'？ – Tdorno
你有一堆組件。哪些不顯示？我建議將問題簡化爲[SSCCE]（http://sscce.org），並刪除所有額外的代碼。您似乎也將同一個面板添加到內容窗格和JFrame（它只是將它傳遞給內容窗格），這表明您可能希望通過精細梳齒來瀏覽代碼。 –