JAVA实验5-流

1、1. 编写程序，要求：用户在键盘每输入一行文本，程序将这段文本显示在控制台中。当用户输入的一行文本是“exit ” (不区分大小写)时，程序将用户所有输入的文本都写入到文件中，并退出。(要求：控制台输入通过流封装获取，不要使用Scanner)package shiyanwu1;importimportimportpublic class test1 quals(line)|"EXIT".equals(line) break;(line).append(LINE_SEP);esolveOrderDatas(dishesDatas);T T T件1件件1件录文录仪仪J 录文目T

2、目T T件 EL TT 一一 一 一文if (temp20) != null) String dishesName = null;int dishesCount = 0;int totalPrice = 0;forString, Integere : () dishesName =();dishesCount =();totalPrice += (dishesName) * dishesCount;"总消费为:"+totalPrice);private List<String> readFile(String fileName) if (fileName !=

3、null && !"".equals(fileName) File file = null;file = new File(fileName);if () List<String> datas = new ArrayList<String>();try Inputstream is = new FilelnputStream(file);BufferedReader br = new BufferedReader(new InputStreamReader(is,"gb2312");String str = nul

4、l;while (true) str = ();if (str != null) (str); else break;(); catch (Exception e) return datas;return null;private Map<String, Integer> resolveOrderDatas(List<String> datas) String temp1 = null, temp2 = null;String detailStr = null;Map<String, Integer> orderDetail = new HashMap<

5、;>();for (int i = 0; i < (); i+) temp1 = (i).split(",");for (int j = 0; j < ; j+) temp2 = temp1j.split(":");if = 2) (temp20, (temp21)+ (temp20); else (temp20, (temp21);return orderDetail;private Map<String, Integer> resolveDishesDatas(List<String> datas) Map&

6、lt;String, Integer> dishesDetail = new HashMap<>();String temp = null;for (int i = 0; i < (); i+) temp = (i).split(":");if = 2) (temp0, (temp1);return dishesDetail;2. 设计学生类Student ，属性：学号(整型)；姓名(字符串)，选修课程(名称)及课程成绩(整型)。编写一个控制台程序，能够实现Student 信息的保存、读取。具体要求：(1)提供 Student 信息的保存功能：通过控

7、制台输入若干个学生的学号、姓名以及每个学生所修课程的课程名和成绩，将其信息保存到中；（2）数据读取显示：能够从文件中读取学生及其课程成绩并显示于控制台。package shiyanwu4;public class Student private int number;private String name;private String courseName;private int score;public int getNumber() return number;public void setNumber(int number) = number;public String getName(

8、) return name;public void setName(String name) = name;public String getCourseName() return courseName;public void setCourseName(String courseName) = courseName;public int getScore() return score;public void setScore(int score) =score;package shiyanwu4;import class StudentMgr public static final Stri

9、ng studentDat = "E:/"public static void main(String口 args) showMenu();Scanner s = null;s = new Scanner;String code = null;Student student;List<Student> datas = new ArrayList<Student>();List<Student> savedStudents = readStudentDat(studentDat); while (true) code =();if (&qu

10、ot;#4".equalsIgnoreCase(code) ”程序已退出");break; else if ("#1".equalsIgnoreCase(code) String tmpStr = null;int tmpInt;while (true) " 学生学号：");tmpInt = ();student = new Student();(tmpInt);" 学生姓名：");tmpStr = ();(tmpStr);" 学生课程：");tmpStr = ();(tmpStr);"

11、; 课程成绩：");tmpInt = ();(tmpInt);(student);" 输入 exit 结束信息录入, 输入其他继续录入");tmpStr = ();if ("exit".equalsIgnoreCase(tmpStr) break;if ("exit".equalsIgnoreCase(tmpStr) showMenu();continue; else if ("#3".equalsIgnoreCase(code) try if() >0 )saveStudents(datas);e

12、lse" 无可保存的学生信息"); catch (IOException e) " 保存学生信息异常");();else if ("#2".equalsIgnoreCase(code) List<Student> students = readStudentDat(studentDat);if(students = null | () = 0)" 暂无学生信息");showMenu();else" 已有学生人数："+();for(int i=0;i<();i+)quals(fi

13、leName) File file = null;file = new File(fileName);Student student = null;if () List<Student> datas = new ArrayList<Student>();try InputStream is = new FileInputStream(file);BufferedReader br = new BufferedReader(new InputStreamReader(is, "gb2312");String str = null;String info

14、s = null;while (true) str = ();if (str != null) student = new Student();str = ();infos = ("#");(infos0);(infos1);(infos2);(infos3);(student); else break;(); catch (Exception e) ();return datas;return null;public static void saveStudents(List<Student> students) throws IOException File

15、 file = new File(studentDat);if (!() ();BufferedWriter bw = new BufferedWriter(new FileWriter(file,true);StringBuffer sb = new StringBuffer();Student s = null;for (int i = 0; i < (); i+) s = (i);(0);() + "#" + () + "#"+ () + "#" + ();();("n");();();public s

16、tatic void showMenu() "");#1、录入学生信息");#2、查看学生信息");"#3 、保存学生信息");"#4 、退出 ");"");5. 编写程序，在控制台窗口提示输入两个整数，然后接收这两个整数，并输出它们的和。(要求：键盘输入通过流封装获取，不要使用Scanner 类)package class InputStreamTest public static void main(String args) BufferedReader in = new BufferedR

17、eader(new InputStreamReader);String line=null;try" 请输入第一个正整数a： ");line = ();int a = (line);" 请输入第二个正整数b： ");line = ();int b = (line);"a+b=" + (a+b);catch(Exception e)" 输入错误！");(0);1）输入3个学生的姓6.设计学生类Student ,属性：编号（整型）；姓名（字符串），成绩（整型）。编写一个程序：要求：（名和成绩，将其姓名和成绩保存到中；(

18、2)然后从该文件中读取数据，求得这五个学生的平均成绩package class Student int id;String name;int score;Student()public void setId(int id)=id;public void setName(String name)=name;public void setScore(int score)=score;public String toString()return + "t" + + "t" + + ”n"package class Main public static void main(String口 args) BufferedReader in = new BufferedReader(new InputStreamReader);tryDataOutputStream out = new DataOutputStream(new FileOutpu