Java 在另一个类中定义ActionListener时发生AWT-EVENT-0错误
我是Java新手,我希望在Java 在另一个类中定义ActionListener时发生AWT-EVENT-0错误,java,swing,Java,Swing,我是Java新手,我希望在JFrameframe中的按钮上添加一个操作 当我在同一个类中使用actionListener时,一切都很好,但是当我将它放在另一个名为Orga_Listener的类中以使代码更干净时,我得到了“awt-event-0”错误。我知道这是因为我的新班级没有收到这个动作 有人能解释一下我如何让另一个类中定义的ActionListener与我的FrameOrganizationJFrame中的按钮一起工作吗 下面是frame和myActionListner派生类的源代码 im
JFrame
frame中的按钮上添加一个操作
当我在同一个类中使用actionListener时,一切都很好,但是当我将它放在另一个名为Orga_Listener
的类中以使代码更干净时,我得到了“awt-event-0”错误。我知道这是因为我的新班级没有收到这个动作
有人能解释一下我如何让另一个类中定义的ActionListener
与我的FrameOrganization
JFrame
中的按钮一起工作吗
下面是frame和myActionListner
派生类的源代码
import ActionListener.Orga_Listener;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.Font;
import java.awt.event.ActionEvent;
import javax.swing.*;
public class FrameOrganisation extends JFrame {
private JTextField jtf = new JTextField("");
private JLabel label = new JLabel("TITRE");
public FrameOrganisation() {
createAndShowGUI();
}
private void createAndShowGUI() {
setTitle("Organisation");
setSize(400,400);
setVisible(true);
setLocationRelativeTo(null);
JPanel top = new JPanel();
Font police = new Font("Arial", Font.BOLD, 14);
jtf.setFont(police);
jtf.setPreferredSize(new Dimension(100, 20));
top.add(label);
top.add(jtf);
getContentPane().add(top, BorderLayout.PAGE_START);
JPanel buttonPane = new JPanel();
JButton button = new JButton("Terminé");
buttonPane.add(button);
button.addActionListener(new Orga_Listener());
getContentPane().add(buttonPane, BorderLayout.PAGE_END);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
}
@Override
public JRootPane createRootPane() {
JRootPane rootPan = new JRootPane();
KeyStroke stroke = KeyStroke.getKeyStroke("ESCAPE");
Action action = new AbstractAction() {
private static final long serialVersionUID = 1L;
public void actionPerformed(ActionEvent e) {
setVisible(false);
dispose();
}
};
InputMap inputMap = rootPan.getInputMap(JComponent.WHEN_IN_FOCUSED_WINDOW);
inputMap.put(stroke, "ESCAPE");
rootPan.getActionMap().put("ESCAPE", action);
return rootPan;
}
}
第二个:
public class Orga_Listener implements ActionListener {
private FrameOrganisation dialog;
//close and dispose of the window.
public void actionPerformed(ActionEvent e) {
dialog.setVisible(false);
dialog.dispose();
}
}
我得到的错误是:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at ActionListener.Orga_Listener.actionPerformed(Orga_Listener.java:21)
at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
at java.awt.Component.processMouseEvent(Component.java:6297)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3275)
at java.awt.Component.processEvent(Component.java:6062)
at java.awt.Container.processEvent(Container.java:2039)
at java.awt.Component.dispatchEventImpl(Component.java:4660)
at java.awt.Container.dispatchEventImpl(Container.java:2097)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4575)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4236)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4166)
at java.awt.Container.dispatchEventImpl(Container.java:2083)
at java.awt.Window.dispatchEventImpl(Window.java:2489)
at java.awt.Component.dispatchEvent(Component.java:4488)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:674)
at java.awt.EventQueue.access$400(EventQueue.java:81)
at java.awt.EventQueue$2.run(EventQueue.java:633)
at java.awt.EventQueue$2.run(EventQueue.java:631)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98)
at java.awt.EventQueue$3.run(EventQueue.java:647)
at java.awt.EventQueue$3.run(EventQueue.java:645)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:644)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
问题是您试图在对话框上调用一个方法,但没有对该对话框的引用 一种解决方案是使用
ActionEvent
中的信息查找对话框:
Component component = (Component)e.getSource();
Window window = SwingUtilities.windowForComponent( component );
window.setVisible( false );
window.dispose();
什么错误?是否有堆栈跟踪?抱歉,我忘记添加错误。我编辑了这条消息,现在应该更好了,看到了吗