Java反射NoSuchMethodException，getConstructor0异常

Exception in thread "main" java.lang.NoSuchMethodException: chapter22.Cat.()
	at java.base/java.lang.Class.getConstructor0(Class.java:3349)
	at java.base/java.lang.Class.getDeclaredConstructor(Class.java:2553)
	at chapter22.reflaction.main(reflaction.java:9)

代码

package chapter22;

import java.lang.reflect.Field;

public class reflaction {
    public static void main(String[] args) throws Exception{
        String path = "chapter22.Cat";
        Class aClass = Class.forName(path);
        Object o = aClass.getDeclaredConstructor().newInstance();
        Field name = aClass.getField("name");
        System.out.println(name.get(o));
    }
}

Cat类

public class Cat {
    public String name = "小黄";
    public int age = 2;
    public char sex = '公';

    public Cat(String name, int age, char sex) {
        this.name = name;
        this.age = age;
        this.sex = sex;
    }
}

即 Object o = aClass.getDeclaredConstructor().newInstance();出错

    public static void main(String[] args) throws Exception{
        String path = "chapter22.Cat";
        Class aClass = Class.forName(path);
        Object o = aClass.getDeclaredConstructor(String.class,int.class,char.class).newInstance("小黄",3,'母');//传入构造类型和参数
        Field name = aClass.getField("name");
        System.out.println(name.get(o));
    }