20141211--C# 构造函数 namespace fengzhuang{ class Class2 { PRivate string _Name; private string _Code; public string _Sex; public Class2()//构造函数 { _Sex = "男";//每次初始化都会默认_Sex的值为“男” Console.WriteLine("构造函数"); } public string nv()//函数 { _Sex = "女"; return _Sex; } }}
static void Main(string[] args) { Class2 op=new Class2();//本身就存在的，只要初始化一下类，便会调用函数， Console.WriteLine(op._Sex); op.nv();//调用函数， Console.WriteLine(op._Sex); Console.WriteLine(); Console.ReadLine(); }
习题：
using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Text;namespace xueshengxuanke{ class Program { static void Main(string[] args) { Console.WriteLine("请输入学生人数："); int n = int.Parse(Console.ReadLine()); Console.WriteLine("请输入学生学号、姓名、分数"); ArrayList arr = new ArrayList(); for (int i = 0; i < n; i++) { student s = new student(); Console.Write("学号："); s.Code = int.Parse(Console.ReadLine()); Console.Write("姓名："); s.Name = Console.ReadLine(); Console.Write("分数："); s.Score = decimal.Parse(Console.ReadLine()); arr.Add(s); } decimal sum = 0; for (int i = 0; i < n; i++) { student avgs = (student)arr[i]; sum += avgs.Score; } ArrayList newarr = new student().Maopao(arr); student ss1 = (student)newarr[0]; Console.WriteLine("姓名：{0}最高分为：{1}", ss1.Name, ss1.Score); int x = n - 1; student ss2 = (student)newarr[x]; Console.WriteLine("姓名：{0}最低分为：{1}", ss2.Name, ss2.Score); Console.WriteLine("平均分：{0}", sum / n); for (int i = 0; i < n; i++) { student avgs = (student)newarr[i]; Console.WriteLine("学生名次为：***********************************"); Console.WriteLine("学号 姓名 分数 名次"); Console.WriteLine("{0} {1} {2} {3}", avgs.Code, avgs.Name, avgs.Score, i + 1); } Console.ReadLine(); } }}
using System;using System.Collections;using System.Collections.Generic;using System.Linq;using System.Text;namespace xueshengxuanke{ class student { private int _Code; public int Code { get { return _Code; } set { _Code = value; } } private string _Name; public string Name { get { return _Name; } set { _Name = value; } } private decimal _Score; public decimal Score { get { return _Score; } set { _Score = value; } } /// <summary> /// 接收arraylist，排序后，返回arraylist /// </summary> /// <param name="arr">存放了student类对象的arraylist</param> /// <returns>返回排序后的集合</returns> public ArrayList Maopao(ArrayList arr) { int n = arr.Count; for (int i = 0; i < n; i++) { for (int j = i; j < n; j++) { student s1 = (student)arr[i]; student s2 = (student)arr[j]; if (s1.Score < s2.Score) { student zhong = new student(); zhong = s1; arr[i] = s2; arr[j] = zhong; } } } return arr; } }}