java反射机制_全球热资讯

import java.lang.reflect.*;public class ReflectionExample {    public static void main(String[] args) throws Exception {        // 获取Class对象        Class cls = Class.forName("Student");        // 创建对象        Object obj = cls.newInstance();        System.out.println(obj);        // 获取方法并调用        Method method = cls.getMethod("setName", String.class);        method.invoke(obj, "John");        System.out.println(obj);        // 获取成员变量并访问        Field field = cls.getDeclaredField("age");        field.setAccessible(true);        field.setInt(obj, 20);        System.out.println(obj);    }}class Student {    private String name;    private int age;    public void setName(String name) {        this.name = name;    }    public String getName() {        return this.name;    }    public void setAge(int age) {        this.age = age;    }    public int getAge() {        return this.age;    }    @Override    public String toString() {        return "Student{name="" + name + "", age=" + age + "}";    }}