package test3; import java.io.FileInputStream; import java.io.IOException; import java.io.InputStreamReader; import java.text.DecimalFormat; import java.util.ArrayList; import java.util.List; public class Frequency { public static void main(String[] args)throws IOException { List<Integer> list=new ArrayList<>(); DecimalFormat df=new DecimalFormat("######0.00"); FileInputStream fip = new FileInputStream("C:\Users\hp\Desktop\信1805-3 班 20183791 马苗苗\test3\src\test3\file"); InputStreamReader reader = new InputStreamReader(fip, "gbk"); StringBuffer sb = new StringBuffer(); while (reader.ready()) { sb.append((char) reader.read()); } //System.out.println(sb.toString()); reader.close(); fip.close(); int i; String A=sb.toString(); String M="abcdefghijklmnopqrstuvwxyz"; String temp = ""; char NUM[]=new char[A.length()]; char Z[]=new char[26]; int X[]=new int[26]; int MAX=0; Z=M.toCharArray(); for(int k=0;k<26;k++) { X[k]=0; for(i=0;i<A.length();i++) { NUM[i]=A.charAt(i); if(Z[k]==NUM[i]||Z[k]==ch(NUM[i])) { X[k]++; } } } System.out.println("这篇文章中英文字母个数分别为:"); double sum=0; System.out.println("////////////排序如下:"); for(i=0;i<25;i++) for(int k=0;k<25-i;k++) { if(X[k]<X[k+1]) { int temp2=X[k]; X[k]=X[k+1]; X[k+1]=temp2; char temp3=Z[k]; Z[k]=Z[k+1]; Z[k+1]=temp3; } } for(i=0;i<26;i++) { sum=sum+X[i]; } for(i=0;i<26;i++) { double jkl=(X[i])/sum*100; System.out.println(Z[i]+"字母个数为:"+X[i]+"字母频率为:"+df.format(jkl)+"%"); } } static char ch(char c) { if(!(c>=97&&c<=122)) c+=32; return c; } }