java中如何反射获取一个类

package poi;
import java.lang.reflect.Constructor;
import java.lang.reflect.Field;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import org.apache.poi.xwpf.usermodel.XWPFSettings;
public class ReflectMain {
 public static void main(String[] arg) throws SecurityException, NoSuchFieldException, IllegalArgumentException, IllegalAccessException, ClassNotFoundException, InstantiationException{
 XWPFSettings ct = new XWPFSettings();
 Class c = ct.getClass();
 System.out.println("---------------------指定类的成员变量-----------------------");
 System.out.println("反射获得的类的成员变量个数");
 System.out.println(c.getDeclaredFields().length);
 for (Field fil : c.getDeclaredFields()) {
  System.out.print(fil.getType()+" ");
  System.out.println(fil.getName());
 }
 System.out.println("------------------------类的构造方法-----------------------");
 for (Constructor constructor : c.getDeclaredConstructors()) {
  System.out.print(Modifier.toString(constructor.getModifiers())+" ");
  System.out.println(constructor.getName());
 }
 System.out.println("--------------------------成员方法--------------------------");
 for (Method method : c.getDeclaredMethods()) {
  System.out.print(Modifier.toString(method.getModifiers())+" ");
  System.out.print(method.getReturnType()+" ");
  System.out.println(method.getName());
 }
 System.out.println("---------------------------类的修饰符------------------------");
 int mod = c.getModifiers();
 String modifier = Modifier.toString(mod);
 System.out.println("modifier = " + modifier);
 System.out.println("------------------------指定类的完全限定名--------------------");
 System.out.println(c.getName());
 System.out.println("------------------------指定类的父类限定名--------------------");
 System.out.println(c.getSuperclass().getName());
 }
}