package frogbean;
import javaawt*;
import javaawtevent*;
import javaio*;
import javautil*;
/**
* 在此处插入类型说明
* 创建日期( ::)
* @authorAdministrator
*/
public class BangBean extends Canvas implements Serializable {
protected int xmym;
protected int cSize=;//circle size
protected String text=Bang!;
protected int fontSize=;
protected Color tColor=Colorred;
protected ActionListener actionListener;
class ML extends MouseAdapter{
public void mousePressed(MouseEvent e){
Graphics g=getGraphics();
gsetColor(tColor);
gsetFont(new Font(TimesRomanFontBOLDfontSize));
int width=ggetFontMetrics()stringWidth(text);
gdrawString(textxmym);
gdispose();
//Call the listeners method:
if(actionListener!=null)
actionListeneractionPerformed(new ActionEvent(BangBeanthisActionEventACTION_PERFORMEDnull));
}
}
class MML extends MouseMotionAdapter{
public void mouseMoved(MouseEvent e){
xm=egetX();
ym=egetY();
repaint();
}
}
/**
* BangBean 构造子注解
*/
public BangBean() {
addMouseListener(new ML());
addMouseMotionListener(new MML());
}
public void addActionListener(ActionListener l) throws TooManyListenersException {
if(actionListener!=null)
throw new TooManyListenersException();
actionListener=l;
}
public String getBeanText(){return text;}
public int getCircleSize(){return cSize;}
public int getFontSize(){return fontSize;}
public Dimension getPreferredSize(){
return new Dimension();
}
public Color getTextColor(){return tColor;}
//Testing the BangBean:
public static void main(String[] args){
BangBean bb=new BangBean();
try{
//During testing send action information to the console:
bbaddActionListener(
new ActionListener(){
public void actionPerformed(ActionEvent e){
Systemoutprintln(BangBean action);
}
}
);
}catch(TooManyListenersException e){}
Frame f=new Frame(BangBean Test);
faddWindowListener(
new WindowAdapter(){
public void windowClosing(WindowEvent e){
Systemexit();
}
}
);
fadd(bbBorderLayoutCENTER);
fsetSize();
fsetVisible(true);
}
public void paint(Graphics g){
gsetColor(Colorblack);
gdrawOval(xmcSize/ymcSize/cSizecSize);
}
public void removeActionListener(ActionListener l){
actionListener=null;
}
public void setBeanText(String newText){text=newText;}
public void setCircleSize(int newSize){cSize=newSize;}
public void setFontSize(int newSize){fontSize=newSize;}
public void setTextColor(Color newColor){tColor=newColor;}
}
以上是bean类
下面用Ibm visual Age for Java 自动生成调试代码测试上边的bean
package frogbean;
import javaapplet*;
import javaawt*;
/**
* 在此处插入类型说明
* 创建日期( ::)
* @authorAdministrator
*/
public class TestBean extends Applet {
private BangBean ivjfirst = null;
/**
* 返回关于此 applet 的信息
* @return 返回关于此 applet 信息的字符串
*/
public String getAppletInfo() {
return TestBean\n +
\n +
在此处插入类型说明\n +
创建日期( ::)\n +
@authorAdministrator\n +
;
}
/**
* 返回 first 特性值
* @return frogbeanBangBean
*/
/* 警告此方法将重新生成 */
private BangBean getfirst() {
if (ivjfirst == null) {
try {
ivjfirst = new frogbeanBangBean();
ivjfirstsetName(first);
ivjfirstsetBounds( );
// user code begin {}
// user code end
} catch (javalangThrowable ivjExc) {
// user code begin {}
// user code end
handleException(ivjExc);
}
}
return ivjfirst;
}
/**
* 每当部件抛出异常时被调用
* @param exception javalangThrowable
*/
private void handleException(javalangThrowable exception) {
/* 除去下列各行的注释以将未捕捉到的异常打印至 stdout */
// Systemoutprintln( 未捕捉到的异常 );
// exceptionprintStackTrace(Systemout);
}
/**
* 初始化 applet
*
* @see #start
* @see #stop
* @see #destroy
*/
public void init() {
try {
superinit();
setName(TestBean);
setLayout(null);
setSize( );
add(getfirst() getfirst()getName());
// user code begin {}
// user code end
} catch (javalangThrowable ivjExc) {
// user code begin {}
// user code end
handleException(ivjExc);
}
}
/**
* 主入口点 当部件作为应用程序运行时启动这个部件
* @param args javalangString[]
*/
public static void main(javalangString[] args) {
try {
Frame frame = new javaawtFrame();
TestBean aTestBean;
Class iiCls = ClassforName(frogbeanTestBean);
ClassLoader iiClsLoader = iiClsgetClassLoader();
aTestBean = (TestBean)javabeansBeansinstantiate(iiClsLoaderfrogbeanTestBean);
frameadd(Center aTestBean);
framesetSize(aTestBeangetSize());
frameaddWindowListener(new javaawteventWindowAdapter() {
public void windowClosing(javaawteventWindowEvent e) {
Systemexit();
};
});
framesetVisible(true);
} catch (Throwable exception) {
Systemerrprintln(javaappletApplet 的 main() 中发生异常);
exceptionprintStackTrace(Systemout);
}
}
/**
* 绘制 applet
* 如果此 applet 不需要绘制（例如如果它只是其它
* awt 部件的一个容器）则可以安全地除去此方法
*
* @param g 指定的图形窗口
* @see #update
*/
public void paint(Graphics g) {
superpaint(g);
//在此处插入用来绘制 applet 的代码
}
}
其中
TestBean aTestBean;
Class iiCls = ClassforName(frogbeanTestBean);
ClassLoader iiClsLoader = iiClsgetClassLoader();
aTestBean = (TestBean)javabeansBeansinstantiate(iiClsLoaderfrogbeanTestBean);
是做什么用的？为什么不直接用
TestBean aTestBean=new TestBean() ?
