单选题 运行下面程序,输出结果是( ). //定义 Person 类 class Person { //成员变量 private String name; private int age; //定义私有化的空构造方法 private Person() { } //定义公有构造方法初始化 name 和 age public Person(String name, int age) { this.name = name; this.age = age; } public void show() { System.out.println(this.name + "," + this.age); } } public class Demo { public static void main(String[] args) { Person p1 = new Person(); Person p2 = new Person("如来", 5600); p2.show(); } }