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using System;
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using System.Collections.Generic;
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using System.Text;
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namespace oop
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{
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class Person
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{
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public string name;
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public int age;
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/**
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* static修饰的字段
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*
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* 用static修饰的字段,它们属于类,而不属于类的某一个实例,
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* 也就是说,在调用静态字段时,只能通过类名来调用,即(Person.sex)
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* 而不能通过类的某一个实例来调用,而不是(Person person = new Person();person.sex)
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* 2.
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* 如果方法被声明为静态的,也是如此
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*/
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public static string sex;
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/**构造方法
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* 特点:
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* 1.与类名相同
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* 2.构造方法一般被声明为public
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* 3.构造方法一般用来初始化成员变量
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* 4.构造方法可以重载
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* 5.构造方法在实例化对象的时候被调用
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* 6.如果类中没有默认构造方法,也没有带参数的构造方法,编译时,将会自动添加一个默认构造方法,
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* 7.如果类中有带参数的构造方法,而没有默认构造方法,则编译器不会再添加默认构造方法,
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* 8.默认构造方法也叫无参构造方法
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*/
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public Person()
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{
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}
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public Person(string name,int age)
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{
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/**
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* this
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* this代表类的实例.
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* 如果一个字段或者方法被声明为static的,则不能用this来调用,因为static声明的字段或者方法属于类,
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* 而this代表的是类的实例(如:this.sex是错误的)
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*/
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this.name = name;
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this.age = age;
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}
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/**
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* 方法的重载
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*
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* 重载的特点:
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* 1.方法名都要相同
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* 2.方法的可以参数不同,返回值可以不同,方法的访问权限可以不同,方法参数不同的几种情况如下:
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* 重载的几种情况:
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*
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* 1.参数的类型不同
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* 2.参数的个数不同()
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* 3.参数的顺序不同(参数的列表不同 在C# 中,这种情况没有实际使用价值)
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* 4.返回类型不同
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* 5.访问修饰符不同?????????????
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*/
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public void GetInfo()
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{
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Console.WriteLine("这个是无参的方法");
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}
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public void GetInfo(string name)
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{
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Console.WriteLine("姓名是:"+name );
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}
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public int GetInfo(int age)
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{
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Console.WriteLine("年龄:"+age);
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return age;
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}
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internal void GetInfo(int age,string name)
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{
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Console.WriteLine(" 年龄: " + age + "姓名:" + name);
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}
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public void GetInfo(string name,int age)
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{
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Console.WriteLine("姓名:" + name +" 年龄: " + age );
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}
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/* 用static修饰的方法
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*
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* 1.static修饰的方法中,不能用this关键字来调用实例字段
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* 2.static修饰的方法中,也不能直接调用实例字段,如果要调用这些字段,
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* 要先实例化对象(如 Person p1 =new Person();p1.age=2;)
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* 3.静态方法中,可以类名调用静态方法
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*/
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public static void StaticInfo()
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{
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Console.WriteLine("这个方法是一个静态方法");
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}
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/**
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* 析构函数
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*
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* 特点:
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* 1.析构函数前有一个"~",表明是一个析构函数
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* 2.析构函数的函数名和类名相同
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* 3.一个类只有一个析构函数
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* 4.析构函数没有参数
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* 5.析构函数没有返回值
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* 6.析构函数没有访问修饰符
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* 7.析构函数不能重载
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* 8.析构函数不能实现继承
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* 9.析构函数是用来清理垃圾的(如:用来清除不再使用的对象)
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* 10.析构函数不用手动调用,而是由垃圾回收器自动调用
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*
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*/
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~Person()
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{
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}
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}
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class Program
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{
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static void Main(string[] args)
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{
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Person p = new Person();
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p.GetInfo();
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Console.WriteLine("\n");
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p.GetInfo("sofie");
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Console.WriteLine("\n");
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p.GetInfo("sofie", 21);
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Console.WriteLine("\n");
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p.GetInfo(21,"sofie");
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Console.WriteLine("\n");
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int a = p.GetInfo(12);
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Console.WriteLine(a);
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}
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}
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}
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