作业4.2

 public static void main(String[] args) 
    {
        Scanner in=new Scanner(System.in);
        System.out.println("请输入想要查找的单词");
         String m=in.nextLine();
         int count=0;
         try{
        FileReader fr1=new FileReader("Gone_with_the_wind.txt");   //读取
        BufferedReader bf1=new BufferedReader(fr1);
        String str=null;
        
        while( (str=bf1.readLine())!=null)
        {
          str=str.replace("\\n", "");
          str=str.toLowerCase();
          str=str.replaceAll("[\\pP‘’“”]", "");
          String[] str1=str.split(" ");
          
          for(int i=0;i<str1.length;i++)
          {
              if(m.equals(str1[i]))count++; 
          }
         
          }    
           fr1.close(); bf1.close();
         }catch(Exception e){e.printStackTrace();}
         
         try{
                 FileWriter fw=new FileWriter("Result1.txt");
                 BufferedWriter bw=new BufferedWriter(fw);
                 bw.write(m+"="+count);
                 bw.close();fw.close();
             }catch(Exception e){e.printStackTrace();} 
             } 
     }