java反射机制生成对象

来源：互联网发布：网络教育大专学费编辑：程序博客网时间：2024/06/04 19:57
package com.ld.reflect;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.Method;import org.junit.Test;public class App {private static Person person1;static {person1 = new Person("liudong", "12");}static Person person = person1;public static void main(String[] args) throws Exception {byMethodCreateObj();}// 对属性进行操作public static void doField() throws Exception {Class classType = Person.class;Field f1 = classType.getDeclaredField("name");Field f2 = classType.getDeclaredField("sex");f1.setAccessible(true);f2.setAccessible(true);f1.set(person, "刘东4");f2.set(person, "男");System.out.println(person.getName() + "   " + person.getSex());}public  static void byMethodCreateObj() throws Exception {Class classType = Person.class;// 调用方法Method method = classType.getMethod("setName", String.class);method.invoke(person, "刘东3");System.out.println(person.getName());// 调用私有方法Method m2 = classType.getDeclaredMethod("say");m2.setAccessible(true);m2.invoke(person);} public void byConCreateObj() throws Exception {@SuppressWarnings("rawtypes")Class classType = (person.getClass());@SuppressWarnings({ "unchecked", "rawtypes" })Constructor c = classType.getConstructor(String.class, String.class);Object obj = c.newInstance("刘东", "14");System.out.println("通过构造方法创建的obj是不是Person类" + (obj instanceof Person));System.out.println(((Person) obj).getName());}public static void bySetCreateObj() throws ClassNotFoundException,NoSuchMethodException {// 返回与带有指定字符串的类或接口相关联的Class对象；// Class classtype = Person.class;// Class classType = person.getClass();Class classType = Class.forName("com.ld.reflect.App$Person");Object obj = classType.getConstructor();System.out.println("使用反射机制创建狐臭俩的对象是否是Person对象"+ (obj instanceof Person));}static class Person {private static String name = "刘东";private static String sex = "nam";public Person() {super();}public Person(String name, String sex) {super();this.name = name;this.sex = sex;}public String getName() {return name;}public void setName(String name) {this.name = name;}public String getSex() {return sex;}public void setSex(String sex) {this.sex = sex;}private static void say() {System.out.println("My name is" + name);}}}
0 0