反射API

获取反射类：

Student.class
student.getClass()
Class<?> aClass=Class.forName("student")

构造器

Object o = aClass.newInstance();  //默认构造器

Constructor<?> constructor = aClass.getConstructor(int.class, String.class);  //指定构造器
T12 sss = (T12)constructor.newInstance(1, "sss");

Field

T12 t12 = new T12();
Field age = aClass.getField("age");
Object o = age.get(t12);

//private
T12 t12 = new T12();
Field age = aClass.getDeclaredField("age");
age.setAccessible(true);
Object o = age.get(t12);
System.out.println(o);

Method

Class<?> aClass = Class.forName("com.sjj.T12");
T12 t12 = new T12();
Method getName = aClass.getMethod("getName");
Object result = getName.invoke(t12);
System.out.println(result);

//private
  Class<?> aClass = Class.forName("com.sjj.T12");
  T12 t12 = new T12();
  Method getName = aClass.getDeclaredMethod("getName");
  getName.setAccessible(true);
  Object result = getName.invoke(t12);
  System.out.println(result);