（二十七）构造函数

class Person {
    private int age;
    private String name;
    Person() {};
    Person(int nianling,String mingzi) {
        name = mingzi;
        age = nianling;
    };//Personal类中的构造函数对类属性 的一个初始化
}
class Demo3 {
    public static void main(String[] args) {
        Person man = new Person();
        man.name="小明";
        man.age = 18;
        Person woman = new Person(23,"大明");
        System.out.println(woman.name + " " + woman.age);
        System.out.println(man.name + " " + man.age);
    }
 
}

class Persons
{
    int age;
    String name;
    Persons () {
    /*
    *    调用有参数的另一个构造函数
    */
    name = "张三";
    age = 23;
    };
    Persons(String name,int age) {
        this();
        this.name = name;
        this.age = age;
    }
}
class Demo8 {
    public static void main(String[] args) {
        Persons person = new Persons("Tom",26);
        System.out.println(person.name + " " + person.age);//结果为TOM，26
    }
}