1、1. 編寫(xiě)程序，要求：用戶(hù)在鍵盤(pán)每輸入一行文本，程序?qū)⑦@段文本顯示在控制臺(tái)中。當(dāng)用戶(hù)輸入的一行文本是“exit ” (不區(qū)分大小寫(xiě))時(shí)，程序?qū)⒂脩?hù)所有輸入的文本都寫(xiě)入到文件中，并退出。(要求：控制臺(tái)輸入通過(guò)流封裝獲取，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件錄文錄儀儀J 錄文目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;"總消費(fèi)為:"+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. 設(shè)計(jì)學(xué)生類(lèi)Student ，屬性：學(xué)號(hào)(整型)；姓名(字符串)，選修課程(名稱(chēng))及課程成績(jī)(整型)。編寫(xiě)一個(gè)控制臺(tái)程序，能夠?qū)崿F(xiàn)Student 信息的保存、讀取。具體要求：(1)提供 Student 信息的保存功能：通過(guò)控

7、制臺(tái)輸入若干個(gè)學(xué)生的學(xué)號(hào)、姓名以及每個(gè)學(xué)生所修課程的課程名和成績(jī)，將其信息保存到中；（2）數(shù)據(jù)讀取顯示：能夠從文件中讀取學(xué)生及其課程成績(jī)并顯示于控制臺(tái)。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) " 學(xué)生學(xué)號(hào)：");tmpInt = ();student = new Student();(tmpInt);" 學(xué)生姓名：");tmpStr = ();(tmpStr);" 學(xué)生課程：");tmpStr = ();(tmpStr);"

11、; 課程成績(jī)：");tmpInt = ();(tmpInt);(student);" 輸入 exit 結(jié)束信息錄入, 輸入其他繼續(xù)錄入");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" 無(wú)可保存的學(xué)生信息"); catch (IOException e) " 保存學(xué)生信息異常");();else if ("#2".equalsIgnoreCase(code) List<Student> students = readStudentDat(studentDat);if(students = null | () = 0)" 暫無(wú)學(xué)生信息");showMenu();else" 已有學(xué)生人數(shù)："+();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、錄入學(xué)生信息");#2、查看學(xué)生信息");"#3 、保存學(xué)生信息");"#4 、退出 ");"");5. 編寫(xiě)程序，在控制臺(tái)窗口提示輸入兩個(gè)整數(shù)，然后接收這兩個(gè)整數(shù)，并輸出它們的和。(要求：鍵盤(pán)輸入通過(guò)流封裝獲取，不要使用Scanner 類(lèi))package class InputStreamTest public static void main(String args) BufferedReader in = new BufferedR

17、eader(new InputStreamReader);String line=null;try" 請(qǐng)輸入第一個(gè)正整數(shù)a： ");line = ();int a = (line);" 請(qǐng)輸入第二個(gè)正整數(shù)b： ");line = ();int b = (line);"a+b=" + (a+b);catch(Exception e)" 輸入錯(cuò)誤！");(0);1）輸入3個(gè)學(xué)生的姓6.設(shè)計(jì)學(xué)生類(lèi)Student ,屬性：編號(hào)（整型）；姓名（字符串），成績(jī)（整型）。編寫(xiě)一個(gè)程序：要求：（名和成績(jī)，將其姓名和成績(jī)保存到中；(

18、2)然后從該文件中讀取數(shù)據(jù)，求得這五個(gè)學(xué)生的平均成績(jī)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