package io;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Set;
public class text5 {
public static void main(String[] args) throws IOException {
  //获取一个文本上每个字符出现的次数,将结果写在times.txt上
  File file=new File("aa.txt");
  FileReader fr=new FileReader(file);
  //FileWriter fw=new FileWriter("")
  HashMap<Character, Integer>map=new HashMap<Character, Integer>();
  int i;
  while((i=fr.read())!=-1){
   char c=(char)i;
   if(map.get(c)==null){
    map.put(c, 1);
   }
   else{
    int x=map.get(c)+1;
   
    map.put(c, x);
   
   }
   
  }
  Set<Character> keySet = map.keySet();
  for (Character character : keySet) {
   System.out.println(character+"    "+  map.get(character));
  }
  
}
}

package io;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.util.HashMap;
import java.util.Set;
public class text5 {
public static void main(String[] args) throws IOException {
  //获取一个文本上每个字符出现的次数,将结果写在times.txt上
  File file=new File("aa.txt");
  FileReader fr=new FileReader(file);
  //FileWriter fw=new FileWriter("")
  HashMap<Character, Integer>map=new HashMap<Character, Integer>();
  int i;
  while((i=fr.read())!=-1){
   char c=(char)i;
   if(map.get(c)==null){
    map.put(c, 1);
   }
   else{
    int x=map.get(c)+1;
   
    map.put(c, x);
   
   }
   
  }
  Set<Character> keySet = map.keySet();
  for (Character character : keySet) {
   System.out.println(character+"    "+  map.get(character));
  }
  
}
}