反射代码块

代码示例package com.atguigu.reflect;import java.lang.reflect.Field;import java.lang.reflect.InvocationTargetException;import java.lang.reflect.Method;import java.lang.reflect.ParameterizedType;import java.lang.reflect.Type;public class ReflectTest {     public static void main(String[] args) {           try {                Class<?> clazz = Class.forName("com.atguigu.reflect.Student");                Object object = clazz.newInstance();                Field f1_age = clazz.getDeclaredField("age");                f1_age.setAccessible(true);                f1_age.set(object, 20);                System.out.println(object);                Method method = clazz.getMethod("add", int.class,double.class);                Object invoke = method.invoke(object, 100,20.22);                System.out.println(invoke);           } catch (ClassNotFoundException e) {                e.printStackTrace();           } catch (InstantiationException e) {                e.printStackTrace();           } catch (IllegalAccessException e) {                e.printStackTrace();           } catch (NoSuchFieldException e) {                e.printStackTrace();           } catch (SecurityException e) {                e.printStackTrace();           } catch (NoSuchMethodException e) {                e.printStackTrace();           } catch (IllegalArgumentException e) {                e.printStackTrace();           } catch (InvocationTargetException e) {                e.printStackTrace();           }     }}abstract class Parent<T> {     private Class clazz;     public Parent() {           Type type = getClass().getGenericSuperclass();           if(type instanceof ParameterizedType) {                ParameterizedType ptype = (ParameterizedType) type;                Type[] types = ptype.getActualTypeArguments();                clazz = (Class) types[0];           } else {                clazz = Object.class;           }     }}class Child extends Parent<Integer> {}class Child2 extends Parent{}Entitypackage com.atguigu.javase.reflect;public class Student {     private static String school = "atguigu";     private String name;     private int age;     public Student() {     }     public Student(String name, int age) {           super();           this.name = name;           this.age = age;     }     public String getName() {           return name;     }     public void setName(String name) {           this.name = name;     }     public int getAge() {           return age;     }     public void setAge(int age) {           this.age = age;     }     @Override     public String toString() {           return "Student [name=" + name + ", age=" + age + "]";     }     public static int add(int x, double y) {           return x + (int)y;     }}