我想知道一个类是否已经被加载,在网上看见这个方法,但是这个方法声明为
protected final
我在代码中获得的ClassLoader 是子加载器,子加载器中没有这个方法,我该怎么用到这个方法呢??
代码如下:
public class reflect_private
{
private String color;
private void drive(){
System.out.println("哈哈哈哈哈的颜色为"+color);
}
}
import java.lang.reflect.Method;
public class reflect_test {
public static void main(String[] args) throws ClassNotFoundException, IllegalAccessException, InstantiationException, NoSuchMethodException, InvocationTargetException, NoSuchFieldException {
ClassLoader cons = Thread.currentThread().getContextClassLoader();
// Class clazz = Class.forName("reflect_private");//cons.loadClass("reflect_private");
Class clazz = cons.loadClass("reflect_private");
reflect_private rp = (reflect_private)clazz.getConstructor().newInstance();
Field colorfed = clazz.getDeclaredField("color");
colorfed.setAccessible(true);
colorfed.set(rp,"red");
Method driveMd = clazz.getDeclaredMethod("drive",(Class[])null);
driveMd.setAccessible(true);
driveMd.invoke(rp,null);
Method flc = cons.getClass().getDeclaredMethod("findLoadedClass", String.class);
flc.setAccessible(true);
flc.invoke(cons,"reflect_private");
}
}
第二段代码是要运行的代码,报错findLoadedClass方法找不到