！ reflect SDK
public class ViewClassInfoFrame extends JFrame implements ActionListener{
JTextField classnameField = new JTextField();
JButton viewinfoButton = new JButton();
JLabel hintLabel = new JLabel();
JTextArea infoTextArea = new JTextArea();
JScrollPane infoScrollPane = new JScrollPane();
TitledBorder titledBorder;
JPanel upPanel = new JPanel();
JPanel centerPanel = new JPanel();
BorderLayout mainFrameBorderLayout = new BorderLayout();
BorderLayout centerPanelBorderLayout = new BorderLayout();
BorderLayout upPanelBorderLayout = new BorderLayout();
/** */
public ViewClassInfoFrame() {
enableEvents(AWTEvent.WINDOW_EVENT_MASK);
init();
validate();
}
/** */
private void init(){
classnameField.setFont(new Font("Dialog",0,15));
classnameField.setSelectedTextColor(Color.white);
classnameField.setText("");
viewinfoButton.setFont(new Font("Dialog",0,13));
viewinfoButton.setText(" ");
viewinfoButton.addActionListener(this);
hintLabel.setFont(new Font("Dialog",0,13));
hintLabel.setText(" ");
infoTextArea.setFont(new Font("Dialog",0,14));
infoTextArea.setEditable(false);
infoTextArea.setText("");
titledBorder = new TitledBorder(BorderFactory.createEtchedBorder(Color.white,new Color(134,134,134))," ");
infoScrollPane.setBorder(titledBorder);
infoScrollPane.getViewport().add(infoTextArea,null);
upPanel.setLayout(upPanelBorderLayout);
centerPanel.setLayout(centerPanelBorderLayout);
upPanel.add(hintLabel,BorderLayout.NORTH);
upPanel.add(classnameField,BorderLayout.CENTER);
upPanel.add(viewinfoButton,BorderLayout.SOUTH);
centerPanel.add(infoScrollPane);
this.getContentPane().setLayout(mainFrameBorderLayout);
this.setSize(new Dimension(450,360));
this.setTitle(" ");
this.getContentPane().add(upPanel,BorderLayout.NORTH);
this.getContentPane().add(centerPanel,BorderLayout.CENTER);
this.getRootPane().setDefaultButton(viewinfoButton);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
}
public void actionPerformed(ActionEvent e) {
String classname = classnameField.getText();
StringBuffer buffer = new StringBuffer();
try {
//
Class c = Class.forName(classname);
buffer.append("/** **/
");
buffer.append(getClassStatement(c));
buffer.append("
");
buffer.append("/** **/");
buffer.append(getFields(c));
buffer.append("/** **/");
buffer.append(getConstructors(c));
buffer.append("/** **/");
buffer.append(getMethods(c));
buffer.append("}
");
} catch (Exception e1) {
JOptionPane.showMessageDialog(this, " ：" + e1.getMessage());
}
infoTextArea.setText(buffer.toString());
}
public String getClassStatement(Class c){
StringBuffer buffer = new StringBuffer();
if(c.getName().equals("java.lang.object")){
buffer.append("public class Ojbect{");
return buffer.toString();
}else {
String supername = c.getSuperclass().getName();
buffer.append("public class").append(c.getName());
buffer.append("extends").append(supername).append(";");
}
return buffer.toString();
}
/**
*
* @param c
* @return
*/
public String getFields(Class c){
StringBuffer buffer = new StringBuffer();
Field field = null;
Field [] fields = c.getFields();
for (int i = 0; i < fields.length; i++) {
field = fields[i];
buffer.append(Modifier.toString(field.getModifiers())).append(" ");
Class type = field.getType();
buffer.append(type.getName()).append(" ");
buffer.append(field.getName()).append(";
");//
}
return buffer.toString();
}
/**
*
* @param c
* @return String
*/
public String getConstructors(Class c){
StringBuffer buffer = new StringBuffer();
Constructor [] constructors = c.getDeclaredConstructors();
Constructor constructor = null;
for (int i = 0; i < constructors.length; i++) {
constructor = constructors[i];
buffer.append(Modifier.toString(constructor.getModifiers())).append(" ");
buffer.append(constructor.getName()).append("(");
//
Class[] paramsTypes= constructor.getParameterTypes();
Class class1= null;
for (int j = 0; j < paramsTypes.length; j++) {
class1 = paramsTypes[j];
if (j==(paramsTypes.length-1)) {
buffer.append(class1.getName());
}else {
buffer.append(class1.getName()).append(",");
}
}
buffer.append(")");
//
Class[] exceTypes = constructor.getExceptionTypes();
for (int j = 0; j < exceTypes.length; j++) {
class1 = exceTypes[j];
if (j==0) {
buffer.append("throws");
}
if(j==(exceTypes.length-1)){
buffer.append(class1.getName());
} else {
buffer.append(class1.getName()).append(", ");
}
}
buffer.append("
");
}
return buffer.toString();
}
/**
*
* @param c
* @return String
*/
public String getMethods(Class c){
StringBuffer buffer = new StringBuffer();
Method[] methods= c.getMethods();
Method method = null;
for (int i = 0; i < methods.length; i++) {
method = methods[i];
buffer.append(Modifier.toString(method.getModifiers())).append(" ");
Class returnType = method.getReturnType();
buffer.append(returnType.getName()).append(" ");
buffer.append(method.getName()).append("(");
//
Class[] paramTypes =method.getParameterTypes();
Class class1 = null;
for (int j = 0; j < paramTypes.length; j++) {
class1 = paramTypes[j];
if (j==(paramTypes.length-1)) {
buffer.append(class1.getName());
} else {
buffer.append(class1.getName()).append(", ");
}
}
buffer.append(")");
//
Class[] exceTypes = method.getExceptionTypes();
for (int j = 0; j < exceTypes.length; j++) {
class1 = exceTypes[j];
if (j==0) {
buffer.append("throws");
}
if(j==(exceTypes.length-1)){
buffer.append(class1.getName());
} else {
buffer.append(class1.getName()).append(", ");
}
}
buffer.append("
");
}
return buffer.toString();
}
/**
* @param args
*/
public static void main(String[] args) {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (Exception e) {
e.printStackTrace();
}
ViewClassInfoFrame frame = new ViewClassInfoFrame();
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension frameSize = frame.getSize();
if (frameSize.height>screenSize.height) {
frameSize.height= screenSize.height;
}
if (frameSize.width>screenSize.width) {
frameSize.width= screenSize.width;
}
frame.setLocation((screenSize.width-frameSize.width)/2, (screenSize.height-frameSize.height)/2);
frame.setVisible(true);
}
}