java——反射

import java.lang.reflect.Constructor;
/**
 * 通过三种方式的反射创建对象
 */
public class Demo19 {
    public static void main(String[] args) throws Exception {
        //不使用反射建立对象
        Person person = new Person();
        System.out.println(person);
        //方式一(通过建立对象)
        Class clazz1 = person.getClass();
        Constructor constructor1 = clazz1.getConstructor();
        Person person1 = (Person) constructor1.newInstance();
        System.out.println(person1);
        //方式二(通过所在路径--相对路径)(建议使用)
        Class clazz2 = Class.forName("com.niuzong.demo.Person");
        Constructor constructor2 = clazz2.getConstructor();
        Person person2 = (Person) constructor2.newInstance();
        System.out.println(person2);
        //方式三(通过类名)
        Class clazz3 = Person.class;
        Constructor constructor3 = clazz3.getConstructor();
        Person person3 = (Person) constructor3.newInstance();
        System.out.println(person3);
    }

}