反射-Construct-Java

import net.dsmxx.PersonFk;

import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;

/**
 * Created with IDEA
 * author:foreign
 * Date:2019/9/29
 * Time:20:02
 */
public class ReflectionFk {
    public static void main(String[] args) throws NoSuchMethodException, IllegalAccessException, InvocationTargetException, InstantiationException {
        Class clazz = PersonFk.class;
        //1 获取public的构造方法
        Constructor[] constructors = clazz.getConstructors();
        for (Constructor constructor : constructors) {
            System.out.println("public的构造方法：" + constructor);
        }
        //2 根据参数获取构造方法
        Constructor constructor = clazz.getConstructor(new Class[]{String.class, Integer.class, Boolean.class});
        System.out.println("String类型的构造方法：" + constructor);
        //3 构造方法参数
        Class[] parameterTypes = constructor.getParameterTypes();
        for (Class para : parameterTypes) {
            System.out.println("构造方法参数：" + para);
        }
        //利用构造方法对象实例化一个类
        Constructor constructor1 = clazz.getConstructor(new Class[]{String.class, Integer.class, Boolean.class});
        Object o = constructor1.newInstance("foreign", 27, true);
        System.out.println("对象：" + o);
        PersonFk personFk = (PersonFk) o;
        System.out.println("对象name：" + personFk.getName());
        System.out.println("对象name：" + personFk.getAge());
        System.out.println("对象name：" + personFk.getGender());
    }
}