云大软件学院C#实验6继承和多态

《云大软件学院C#实验6继承和多态》由会员上传分享，免费在线阅读，更多相关内容在工程资料-天天文库。

1、指标等级ABCD功能完整程序质量按时检查提问回答榆杳时间总评成绩序号：课程名称：C#与・NET实验学号：实验老师：实验名称：实验6：继承和多态姓名：课程名称C#与.NET实验实验项目实验6：继承和多态实验目的熟悉并掌握，C#的类继承与多态的特性。实验内容（算法、程序、步骤和方法）(1)类型QueryTest的程序代码如下：usingSystem;usingSystem.IO;usingSystem.Collections;namespaceQueryTextLanguageTest{publicclassQueryTest{staticvoidMain(string[]

2、args){Queryquery二null;Console・WriteLine("TextQue:ry:begin()“)；Booleansign二true;//追出标记while(sign){〃Console.Write(''Pleaseenteraqueryor'q‘toQuit:“)；stringstatement=Console.ReadLine();//读取查询语句if(statement.Equals(〃q〃))//退汕查询{Console.WriteLine(z，0K,bye!TextQuery:end()z/);sign二false;}else{

3、if(query!=null){query=QueryTest.parseQuery(statement);query,eval();query,evalprint();}else{Console.WriteLine你的输入有误，请重新输入!〃)；}}}}//对输入的语句进行处理，返回查询类型publicstaticQueryparseQuery(stringstatement)Queryquery=nulI;Queryql=nul1;Queryq2=nul1;Queryq3=null;Queryq4=nul1;string[5];ArrayListwordl=ne

4、wArrayList();string[]word=newstatement二statement.ToLower();word=statement.SplitC');if(word.Length==1)〃匹配各种查询语句{query=newNameQuery(statement);}elseif(word.Length==2&&word[0].Equals(〃！〃)){query二newNotQuerv(wordEll);}elseif(word.Length==3&&word[1].Equals(〃I")){ql=newNameQuery(wordE0]);q2二ne

5、wNameQuery(wordE2]);query=newOrQuery(ql,q2);}elseif(word.Length==3&&word[1].Equals(〃&&〃)){实验内容（算法、程序、步骤和方法）ql=newNameQuery(wordE0]);q2=newNameQuery(word[2]);query二newAndQuery(ql,q2);}elseif(word[1].Equals("&&〃)&&word[3].Equals(〃

6、〃)){ql=newNameQuery(wordE0]);q2=newNameQuery(word[2]);q3=ne

7、wNameQuery(word[4]);q4=newAndQuery(ql,q2);q4.eval();q4.eval_print();query=newOrQuery(q4,q3);}elseif(word[1].Equals(〃

8、〃)&&word[3].Equals("&&")){ql二newNameQuery(wordE0]);q2=newNameQuery(word[2]);q3=newNameQuery(word[4]);q4=newOrQuery(ql,q2);q4.eval();q4.eval_print();query=newAndQuery(q4,q3

9、);}else{query=nul1;}returnquery;(2)类型Query的程序代码如下：abstractpublicclassQuery{protectedinttextLines;protectedStreamReadersr;protectedstringtext_line=null;protectedArrayListnumList二null;实验内容（算法、程序、步骤和方法）protectedArrayList1ineList二nul1;publicArraylJstNumList//文本行号链表{get{return