Java面向对象程序设计实验-实验八输入输出流

1、. *科技大学计通学院Java面向对象程序设计实验实验八输入输出流学生：*：班级：指导教师：专业：计算机科学与技术提交日期：年月日实验报告容实验目的掌握字符输入、输出流用法；掌握使用Scanner类解析文件；掌握Console流的使用。实验容实验教材-第12章实验1、2、3字符输入输出流；Scanner类和Console类。要求:完善程序,给出实验结果截图；完成试验后练习。程序代码及运行结果：实验1 举重成绩单/AnalysisResult.javaimport java.io.*; import java.util.*;public class AnalysisResult public s

2、tatic void main(String args) File fRead=new File(score.t*t); File fWrite=new File(scoreAnalysis.t*t); try Writer out=new FileWriter(fWrite); BufferedWriter bufferWrite=new BufferedWriter(out); Reader in=new FileReader(fRead); BufferedReader bufferRead=new BufferedReader(in); String str=null; while(s

3、tr=bufferRead.readLine()!=null) double totalScore=Fen*i.getTotalScore(str); str=str+总成绩：+totalScore; System.out.println(str); bufferWrite.write(str); bufferWrite.newLine(); bufferRead.close(); bufferWrite.close(); catch(IOE*ception e) System.out.println(e.toString(); /Fen*i.javaimport java.util.*; p

4、ublic class Fen*i public static double getTotalScore(String s) String rege* = 0123456789.; String digitMess = s.replaceAll(rege*,*); StringTokenizer fen*i = new StringTokenizer(digitMess,*); double totalScore=0; while(fen*i.hasMoreTokens() double score=Double.parseDouble(fen*i.ne*tToken(); totalScor

5、e=totalScore+score; return totalScore; /score.t*t：三，抓举成绩 106kg，挺举 189kg。：四，抓举成绩 108kg，挺举 186kg。：周五，抓举成绩 112kg，挺举 190kg。运行结果如图1所示图1实验2 统计英文单词/WordStatistic.javaimport java.io.*; import java.util.*;public class WordStatistic Vector allWord,noSameWord; File file=new File(english.t*t); Scanner sc=null;

6、String rege*; WordStatistic () allWord=new Vector(); noSameWord=new Vector(); rege*=sdpPunct+;/正则表达式 try sc=new Scanner(file); sc.useDelimiter(rege*); catch(IOE*ception e*p) System.out.println(e*p.toString(); void setFileName(String name) file=new File(name); try sc=new Scanner(file); sc.useDelimite

7、r(rege*); catch(IOE*ception e*p) System.out.println(e*p.toString(); void WordStatistic() try while(sc.hasNe*t() String word=sc.ne*t(); allWord.add(word); if(!noSameWord.contains(word) noSameWord.add(word); catch(E*ception e) public VectorgetAllWord() return allWord; public VectorgetNoSameWord() retu

8、rn noSameWord; /OutputWordMess.javaimport java.util.*;public class OutputWordMess public static void main(String args) Vector allWord,noSameWord; WordStatistic statistic=new WordStatistic(); statistic.setFileName(hello.t*t); statistic.WordStatistic(); allWord=statistic.getAllWord(); noSameWord=stati

9、stic.getNoSameWord(); System.out.println(共有+allWord.size()+个英文单词); System.out.println(有+noSameWord.size()+个互不一样英文单词); System.out.println(按出现的频率排列：); int count=new intnoSameWord.size(); for(int i=0;inoSameWord.size();i+) String s1=noSameWord.elementAt(i); for(int j=0;jallWord.size();j+) String s2=all

10、Word.elementAt(j); if(s1.equals(s2) counti+; for(int m=0;mnoSameWord.size();m+) for(int n=m+1;ncountm) String temp=noSameWord.elementAt(m); noSameWord.setElementAt(noSameWord.elementAt(n), m); noSameWord.setElementAt(temp, n); int t=countm; countm=countn; countn=t; for(int m=0;mnoSameWord.size();m+)

11、 double frequency=(1.0*countm)/allWord.size(); System.out.printf(%s:%-7.3f, noSameWord.elementAt(m),frequency); 运行结果如图2所示图2实验3 密码流/PassWord.javaimport java.io.*;public class PassWord public static void main(String args) boolean success=false;int count=0;Console cons;char passwd;cons=System.console()

12、;while(true)System.out.print(输入密码：);passwd=cons.readPassword(); count+;String password= new String(passwd);if(password.equals(tiger123)success=true;System.out.println(您第+count+次输入的密码正确！);break;elseSystem.out.println(您第+count+次输入的密码+password+不正确！);if(count=3)System.out.println(您+count+次输入的密码都不正确！);Sy

13、stem.e*it(0);if(success)File file=new File(score1.t*t);tryFileReader inOne=new FileReader(file);BufferedReader inTow=new BufferedReader(inOne);String s=null;while(s=inTow.readLine()!=null)System.out.println(s);inOne.close();inTow.close();catch(IOE*ception ioe) /score.t*t：三，抓举成绩 106kg，挺举 189kg。：四，抓举成

14、绩 108kg，挺举 186kg。：周五，抓举成绩 112kg，挺举 190kg。运行结果如图3所示图3实验后的练习：实验1有如下格式的成绩单文本格式score.t*t。：三，数学72分，物理67分，英语70分。：四，数学92分，物理98分，英语88分。：周五，数学68分，物理80分，英语77分。要求按行读入取成绩单，并在该行的后面尾加上该同学的总成绩，然后再将该行写入到一个名字为scoreAnalysis.t*t的文件中。/AnalysisResult.javaimport java.io.*; import java.util.*;public class AnalysisResult p

15、ublic static void main(String args) File fRead=new File(score.t*t); File fWrite=new File(scoreAnalysis.t*t); try Writer out=new FileWriter(fWrite,true); BufferedWriter bufferWrite=new BufferedWriter(out); Reader in=new FileReader(fRead); BufferedReader bufferRead=new BufferedReader(in); String str=n

16、ull; while(str=bufferRead.readLine()!=null) double totalScore=Fen*i.getTotalScore(str); str=str+总分：+totalScore; System.out.println(str); bufferWrite.write(str); bufferWrite.newLine(); bufferRead.close(); bufferWrite.close(); catch(IOE*ception e) System.out.println(e.toString(); /Fen*i.javaimport jav

17、a.util.*;public class Fen*i public static double getTotalScore(String s) Scanner scanner=new Scanner(s); scanner.useDelimiter(0123456789.+); double totalScore=0; while(scanner.hasNe*t() try double score=scanner.ne*tDouble(); totalScore=totalScore+score; catch(InputMismatchE*ception e*p) String t=sca

18、nner.ne*t(); return totalScore; /score.t*t：三，数学72分，物理67分，英语70分。：四，数学92分，物理98分，英语88分。：周五，数学68分，物理80分，英语77分。运行结果如图4所示图4实验2 按字典序输出全部不一样的单词。/Dictionary.javaimport java.util.*;public class Dictionary public static void main(String args)Vector allWord,noSameWord;WordStatistic statistic=new WordStatistic()

19、;statistic.setFileName(hello.t*t);statistic.WordStatistic();/statistic调用WordStatistic()方法allWord=statistic.getAllWord();noSameWord=statistic.getNoSameWord();System.out.println(共有+allWord.size()+个英文单词);System.out.println(有+noSameWord.size()+个互不一样英文单词);System.out.println(按字典顺序排列:);String s=new String

20、noSameWord.size();for(int i=0;inoSameWord.size();i+)si=noSameWord.elementAt(i);Arrays.sort(s);for(int i=0;inoSameWord.size();i+)System.out.println(si+ );运行结果如图5所示图5实验3 编写一个程序，程序运行时，要求用户输入的密码是：hello。如果用户输入了正确的密码。程序将输出你好，欢送你！。程序允许用户2次输入的密码不正确，一旦超过2次，程序将立刻退出。/PassWord.javaimport java.io.*; import java.util.Scanner; public class PassWord pu