具有默认构造函数

//package com.nowjava;


public class Main {//时 代 J a v a - N o w J a v a . c o m 提供

    public static void main(String[] argv) throws Exception {

        Class clazz = String.class;

        System.out.println(hasDefaultConstructor(clazz));

    }


    public static boolean hasDefaultConstructor(Class clazz) {

        try {

            clazz.getConstructor(new Class[0]);

            return true;

        } catch (NoSuchMethodException ex) {

            return false;

        }

    }

}