好的，当我告诉您我已经对此进行了尽职调查时，请相信我。我一直在尝试调试这个最长的时间，我一遍又一遍地查看代码。我检查了 Stack Overflow，没有人遇到过这个问题。
所以我试图在 Java Swing 中创建一个菜单。此菜单位于JPanel. 我知道按照惯例，它应该在 a 上，JFrame但它最适合我在 JPanel 上的情况。问题是，当我单击“功能”菜单并尝试将鼠标悬停在其中的一个菜单项上时，菜单会自动消失。我试图在 a 上实现相同的代码，JFrame但发生了同样的事情。
所以事不宜迟，代码如下：
public static String[] getRGBInputsFromDialogBox(String title) {
JTextField rField = new JTextField(5);
JTextField gField = new JTextField(5);
JTextField bField=new JTextField(5);
JPanel myPanel = new JPanel(new FlowLayout());
myPanel.add(new JLabel("R(x,y): "));
myPanel.add(rField);
myPanel.add(Box.createHorizontalStrut(15)); // a spacer
myPanel.add(new JLabel("G(x,y): "));
myPanel.add(gField);
myPanel.add(Box.createHorizontalStrut(15));//spacer
myPanel.add(new JLabel("B(x,y): "));
myPanel.add(bField);
String[] myClasses=ClassInfo.getClasses();
// { { { { } , { } } , { { } , { } } } , { { { } , { } } , { { } , { } } } }
//Creating Menu Bar
JMenuBar menuBar=new JMenuBar();
JMenu functionsMenu=new JMenu("Functions");
JMenuItem[] classes=new JMenuItem[myClasses.length];
for(int i=0;i<ClassInfo.classes.length;i++) {
String[][] classMethods=ClassInfo.showMethodsForClass(ClassInfo.classes[i]);// { {static} , {instance} }
final String className=ClassInfo.classes[i].getSimpleName();
JMenuItem[] staticMethodsItem=new JMenuItem[classMethods[0].length];
JMenuItem[] instanceMethodsItem=new JMenuItem[classMethods[1].length];
JMenuItem staticMenuItem=new JMenuItem("Static methods");
JMenuItem instanceMenuItem=new JMenuItem("Instance methods");
JMenu staticMenu=new JMenu();
staticMenuItem.add(staticMenu);
JMenu instanceMenu=new JMenu();
instanceMenuItem.add(instanceMenu);
for(int a=0;a<classMethods[0].length;a++) {
final String methodName=classMethods[0][a];
staticMethodsItem[a]=new JMenuItem(methodName);
staticMethodsItem[a].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ClassInfo.copyToClipBoard(ClassInfo.staticWriteableString(methodName,className));
}
});
staticMenu.add(staticMethodsItem[a]);
}
for(int a=0;a<classMethods[1].length;a++) {
final String methodName=classMethods[1][a];
instanceMethodsItem[a]=new JMenuItem(methodName);
instanceMethodsItem[a].addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
ClassInfo.copyToClipBoard(ClassInfo.instanceWriteableString(methodName));
}
});
instanceMenu.add(instanceMethodsItem[a]);
}
classes[i]=new JMenuItem(className);
JMenu methodTypeMenu=new JMenu();
methodTypeMenu.add(staticMenuItem); //add static method submenu to the new class submenu
methodTypeMenu.add(instanceMenuItem);//add instance method submenu to the new class submenu
classes[i].add(methodTypeMenu); //Make the new class a submenu
functionsMenu.add(classes[i]); //Add a new class in the functions menu
}
menuBar.add(functionsMenu);
myPanel.add(menuBar);
int result = JOptionPane.showConfirmDialog(null, myPanel, title, JOptionPane.OK_CANCEL_OPTION);
if (result == JOptionPane.OK_OPTION) {
String[] arr= {rField.getText(),gField.getText(),bField.getText()};
return arr;
}
return null;
}
我知道的相当多。任何形式的帮助都将不胜感激。非常感谢！
编辑：根据要求，这是我的 courseInfo 课程：
public class ClassInfo {
public static Class<?>[] classes={Outputer.class,Vector3.class};
/*
public static void main(String[] args) {
System.out.println(classes[0].getMethods()[4].toGenericString());
//public static int Outputer.fib(int) for static methods
//public double Outputer.getOutputB(int,int) for instance methods
}
*/
public static String[] getClasses() {
final JFrame classesFrame=new JFrame("Select a Class You want to Use");
String[] classNames=new String[classes.length];
for(int i=0;i<classes.length;i++) {
classNames[i]=classes[i].getName();
}
return classNames;
/*
SpinnerListModel listModel=new SpinnerListModel(classNames);
JPanel spinnerPanel= new JPanel();
JPanel buttonPanel=new JPanel();
JLabel spinnerLabel=new JLabel("Choose a Class Whose Methods You Want to Inspect");
final JSpinner classSpinner = new JSpinner(listModel);
spinnerPanel.add(spinnerLabel);
spinnerPanel.add(classSpinner);
JButton inspectButton=new JButton("Inspect Methods");
buttonPanel.add(inspectButton);
inspectButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
for(int i=0;i<classes.length;i++) {
if(classes[i].getName().equals(classSpinner.getValue())) {
showMethodsForClass(classes[i]);
classesFrame.dispose();
break;
}
}
}
});
classesFrame.add(spinnerPanel);
classesFrame.add(buttonPanel);
classesFrame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
classesFrame.pack();
classesFrame.setVisible(true);
*/
}//End Of Method----------------------------------------------------------------------------------------------------------------
public static String[][] showMethodsForClass(Class<?> myClass) {
final String className=myClass.getSimpleName();
Method[] methods=myClass.getMethods();
String[] staticMethodStrings1=new String[methods.length];
String[] instanceMethodStrings1=new String[methods.length];
int statCount=0,instCount=0;
for(int i=0;i<methods.length;i++) {
String method=methods[i].toGenericString();
System.out.println(method); //For Debugging
if(!method.contains("private") && !method.contains("java.")) {
if(methodIsStatic(method)) {
staticMethodStrings1[statCount]=method;
statCount++;
} else {
instanceMethodStrings1[instCount]=method;
instCount++;
}
}
} //End of for loop
String[] staticMethods=new String[statCount];
String[] instanceMethods=new String[instCount];
for(;statCount>0;statCount--) {
staticMethods[statCount-1]=staticMethodStrings1[statCount-1];
}
for(;instCount>0;instCount--) {
instanceMethods[instCount-1]=instanceMethodStrings1[instCount-1];
}
String[][] arr= {staticMethods,instanceMethods};
return arr;
/* JFrame frame=new JFrame("Select a Method to Copy");
frame.setLayout(new GridLayout());
JPanel staticPanel=new JPanel();
JPanel instancePanel=new JPanel();
final JComboBox staticMethodsBox=new JComboBox(staticMethods);
final JComboBox instanceMethodsBox=new JComboBox(instanceMethods);
JButton copyStaticButton=new JButton("Copy this Static Method");
JButton copyInstanceButton=new JButton("Copy this Instance Method");
copyStaticButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
copyToClipBoard(staticWriteableString((String)staticMethodsBox.getSelectedItem(),className));
}
});
copyInstanceButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
copyToClipBoard(instanceWriteableString((String)staticMethodsBox.getSelectedItem()));
}
});
staticPanel.add(staticMethodsBox);
staticPanel.add(copyStaticButton);
instancePanel.add(instanceMethodsBox);
instancePanel.add(copyInstanceButton);
frame.add(staticPanel);
frame.add(instancePanel);
frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
frame.pack();
frame.setVisible(true);
*/
}//End Of Method----------------------------------------------------------------------------------------------------------------
private static boolean methodIsStatic(String methodString) {
return methodString.contains("static ");
}//End Of Method----------------------------------------------------------------------------------------------------------------
//public static int Outputer.fib(int) for static methods
//public double Outputer.getOutputB(int,int) for instance methods
public static String staticWriteableString(String methodStr,String className) {
return methodStr.substring(methodStr.indexOf('.')-className.length());
}
public static String instanceWriteableString(String methodStr) {
return methodStr.substring(methodStr.indexOf('.'));
}
public static void copyToClipBoard(String myString) {
StringSelection stringSelection = new StringSelection (myString);
Clipboard clpbrd = Toolkit.getDefaultToolkit ().getSystemClipboard ();
clpbrd.setContents (stringSelection, null);
}
}//End of Class---------------------------------------------------------------------------------------------------------------------