Java反射的简单实现

Java反射的简单实现，

新建一个User类将属性和方法设置为public不然获取不到，

public class User {
    public String name;
    public int 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;
    }

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public User() {
    }

    @Override
    public String toString() {
        return "User [name=" + name + ", age=" + age + "]";
    }
}

测试

private static void fanshe() throws ClassNotFoundException, InstantiationException, IllegalAccessException {
        // 加载类
        Class cls = Class.forName("com.wb.day01.test.entity.User");
        //获取该类的所有属性
        Field[] fields = cls.getFields();
        for (Field f : fields)
            System.out.println("属性名称：" + f.getName());
        //获取该类的所有方法
        Method[] methods = cls.getMethods();
        for (Method m : methods)
            System.out.println("方法名称：" + m.getName());
        //通过反射来建立一个User对象
        User user = (User)cls.newInstance();
        user.setName("小明");
        user.setAge(30);
        System.out.println(user);
    }