import java.io.File; import java.io.InputStreamReader; import java.math.BigDecimal; import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileInputStream; import java.util.Arrays; import java.util.List; import java.util.StringTokenizer; import java.io.FileWriter; public class titletwo { public static void main(String args[]) { int totalnum=0; String ha; int length; int n; char ba; char letter[]=new char[60]; int sum[]=new int[60]; int num=0; String chuan="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"; letter=chuan.toCharArray(); try { String pathname = "C:\Users\26624\Desktop\Harry Potter and the Sorcerer's Stone.txt"; // 绝对路径或相对路径都可以，这里是绝对路径，写入文件时演示相对路径 File file = new File(pathname); InputStreamReader reader = new InputStreamReader( new FileInputStream(file)); BufferedReader br = new BufferedReader(reader); String line = ""; line = br.readLine(); while (line != null) { StringTokenizer str = new StringTokenizer(line, ",,., ,!,?,“,”,‘,-,'"); while (str.hasMoreElements()) { ha=String.valueOf(str.nextElement()); length=ha.length(); n=0; while(true) { ba=ha.charAt(n++); switch(ba) { case 'a' : sum[0]++;break; case 'b' : sum[1]++;break; case 'c' : sum[2]++;break; case 'd' : sum[3]++;break; case 'e' : sum[4]++;break; case 'f' : sum[5]++;break; case 'g' : sum[6]++;break; case 'h' : sum[7]++;break; case 'i' : sum[8]++;break; case 'j' : sum[9]++;break; case 'k' : sum[10]++;break; case 'l' : sum[11]++;break; case 'm' : sum[12]++;break; case 'n' :sum[13]++;break; case 'o' :sum[14]++;break; case 'p' :sum[15]++;break; case 'q' :sum[16]++;break; case 'r' :sum[17]++;break; case 's' :sum[18]++;break; case 't' :sum[19]++;break; case 'u' :sum[20]++;break; case 'v' :sum[21]++;break; case 'w' :sum[22]++;break; case 'x' :sum[23]++;break; case 'y' :sum[24]++;break; case 'z' :sum[25]++;break; case 'A' : sum[26]++;break; case 'B' : sum[27]++;break; case 'C' : sum[28]++;break; case 'D' : sum[29]++;break; case 'E' : sum[30]++;break; case 'F' : sum[31]++;break; case 'G' : sum[32]++;break; case 'H' : sum[33]++;break; case 'I' : sum[34]++;break; case 'J' : sum[35]++;break; case 'K' : sum[36]++;break; case 'L' : sum[37]++;break; case 'M' : sum[38]++;break; case 'N' :sum[39]++;break; case 'O' :sum[40]++;break; case 'P' :sum[41]++;break; case 'Q' :sum[42]++;break; case 'R' :sum[43]++;break; case 'S' :sum[44]++;break; case 'T' :sum[45]++;break; case 'U' :sum[46]++;break; case 'V' :sum[47]++;break; case 'W' :sum[48]++;break; case 'X' :sum[49]++;break; case 'Y' :sum[50]++;break; case 'Z' :sum[51]++;break; } totalnum++; length--; if(length<=0) { break; } } } line = br.readLine(); // 一次读入一行数据 } } catch (Exception e) { e.printStackTrace(); } int ma,b; char a; for(int i=0;i<51;i++) { ma=sum[i]; b=i; a=letter[i]; for(int j=i+1;j<52;j++) { if(ma>=sum[j]) { ma=sum[j]; b=j; } } ma=sum[i]; sum[i]=sum[b]; sum[b]=ma; letter[i]=letter[b]; letter[b]=a; } for(int i=51;i>=0;i--) { double what=(double)sum[i]/totalnum*100; BigDecimal bg=new BigDecimal(what); double f1=bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); System.out.println(letter[i]+" "+f1+"%"); } }
功能二、三：
import java.io.BufferedReader; import java.io.File; import java.io.FileInputStream; import java.io.InputStreamReader; import java.math.BigDecimal; import java.nio.file.DirectoryStream; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.Arrays; import java.util.List; import java.util.Scanner; import java.util.StringTokenizer; public class titlesix { public static void haha(String road) { int m=0; int n=0; int flag; String word[]=new String[10000]; int sum[]=new int[10000]; String ha[]=new String[10000]; List<String> list; String w; int totalnum=0; int i=0; try { // 防止文件建立或读取失败，用catch捕捉错误并打印，也可以throw /* 读入TXT文件 */ String pathname = road; // 绝对路径或相对路径都可以，这里是绝对路径，写入文件时演示相对路径 File filename = new File(pathname); // 要读取以上路径的input。txt文件 InputStreamReader reader = new InputStreamReader( new FileInputStream(filename)); BufferedReader br = new BufferedReader(reader); String line = ""; line = br.readLine(); while (line != null) { StringTokenizer st2 = new StringTokenizer(line, " ,-"); i=0; while (st2.hasMoreElements()) { ha[i]=String.valueOf(st2.nextElement()); ha[i]=ha[i].toLowerCase(); m++; list = Arrays.asList(word); flag = list.indexOf(ha[i]); if(flag==-1) { word[n]=ha[i]; sum[n]++; n++; totalnum++; } else { sum[flag]++; totalnum++; } i++; } line = br.readLine(); // 一次读入一行数据 } } catch (Exception e) { e.printStackTrace(); } int ma=0; int biao=0; for(int j=0;j<n-1;j++) { ma=sum[j]; biao=j; w=word[j]; for(int k=j+1;k<n;k++) { if(ma<sum[k]) { ma=sum[k]; biao=k; } } sum[biao]=sum[j]; sum[j]=ma; word[j]=word[biao]; word[biao]=w; } System.out.println("请输入前N名单词的个数："); Scanner shuru=new Scanner(System.in); int mmm; mmm=shuru.nextInt(); for(int j=0;j<mmm;j++) { double what=(double)sum[j]/totalnum*100; BigDecimal bg=new BigDecimal(what); double f1=bg.setScale(2, BigDecimal.ROUND_HALF_UP).doubleValue(); System.out.println(word[j]+" "+f1+"%"); } } public int way(String dao) { int length; int flag=1; Path path=Paths.get(dao); try { DirectoryStream<Path> children=Files.newDirectoryStream(path); for(Path child:children) { flag=1; String lujing; lujing=child.toString(); length=lujing.length(); if(length==0) { return 0; } char sta[]=new char[1000]; sta=lujing.toCharArray(); for(int i=0;i<length;i++) { if(sta[i]=='\') { sta[i]='/'; } if(sta[i]=='.') { flag=0; } } lujing=String.valueOf(sta); System.out.println(lujing); if(flag==1) { way(lujing); } else { titlefive.haha(lujing); } } }catch(Exception e){} return 0; } public static void main(String[] args) { { titlesix sta=new titlesix(); sta.way("D:/aaa"); } } }