这里面包含了一百多个JAVA源文件

				Object o = new String();
				    Class sup = o.getClass().getSuperclass();  // java.lang.Object
				    
				    // Superclass of Object is null
				    o = new Object();
				    sup = o.getClass().getSuperclass();        // null
				    
				    // Although the type of o2 is an interface, getSuperclass() returns the object's superclass
				    Runnable o2 = new Runnable() {
				        public void run() {
				        }
				    };
				    sup = o2.getClass().getSuperclass();       // java.lang.Object