class Demo
 {
 public string DemoName { get; set; }
 public Demo() //创建无参构造函数
 {
 this.DemoName = "无参构造函数"; //方法体内写在创建对象时需要初始化的属性
 }
 }

class Demo
 {
 public string DemoName { get; set; }
 public Demo(string DemoName) //创建带参构造函数
 {
 this.DemoName = DemoName;
 }
 }
 class Test
 {
 Demo demo = new Demo("带参构造函数"); //创建对象时在小括号内指定值
 }

 class Demo
 {
 public string DemoName { get; set; }
 /*********构造函数重载********/
 public Demo()
 {
 this.DemoName = "无参构造函数";
 }
 public Demo(string demoName)
 {
 this.DemoName = demoName;
 }
 /**********方法重载**********/
 public void SayHello(string name)
 {
 Console.WriteLine("你好，我是{0}，很高兴认识你。", name);
 }
 public void SayHello(string name, int age)
 {
 Console.WriteLine("你好，我是{0}，今年{1}岁，很高兴认识你。", name, age);
 }
 }
 class Test
 {
 /*********构造函数重载********/
 Demo demo = new Demo();
 Demo demo1 = new Demo("带参构造函数");
 /**********方法重载**********/
 public void Test()
 {
 demo.SayHello("小明");
 demo.SayHello("小明", 18);
 }
 }