请在下面代码中加入监听器语句。importjava.awt.*； importjava.applet.Applet； publicclassSimpleextendsAppleimplementsMouseListener { StringBuffer； publicvoidinit() { //监听器语句 buffer=newStringBuffer()； addltem(“initializing…”)； } publicvoidmoseEntered(MouseEventevent) {} publicvoidmoseExited(MouseEventevent) {} publicvoidmosePressed(MouseEventevent) {} publicvoidmoseReleased(MouseEventevent) {} publicvoidmoseClicked(MouseEventevent) { addltem(“click!…”)； } }