在文本文件中搜索並計數單詞，但無法忽略使用分隔符的句號

Question

在文本文件中搜索並計數單詞，但無法使用分隔符忽略句號。我使用分隔符來忽略單詞後面的句號。我試圖通過使用用戶輸入創建一個文件，然後詢問他們想要在文本文件中搜索的詞，並向他們顯示文本中發生的次數。 這是我的主類 公共類主要 {

public static void main(String []args) throws IOException 
{ 

     str s=new str(); 
     s.writer(); 
     s.reader(); 


} 
} 



this is my class that has both the methods to create and read a file. 

public void reader() 
{ 
     String s; 
    int i=0; 
    //Reading The File 
     try { 
      FileReader f=new FileReader("karan.txt"); 
       Scanner sc=new Scanner(f); 
       Scanner st=new Scanner(System.in); 
       System.out.print("Enter string to be found and counted: "); 
       s=st.nextLine(); 
       System.out.print("\n"); 
       sc.useDelimiter("."); 
       sc.nextLine(); 
       while(sc.hasNext()) 
       { 
        if(sc.next().equals(s)) 
       { 

        i++; 
       } 
       } 
      System.out.println("The number of times the word "+s+" is present is "+i); 

     } catch (FileNotFoundException ex) { 
      System.out.println("File not found"); 
     } 
} 
//Writing The File 
public void writer() throws IOException 
{ 

     try { 
      FileWriter fw=new FileWriter("karan.txt"); 
       PrintWriter p=new PrintWriter(fw) ; 
       Scanner st=new Scanner(System.in); 
       System.out.println("Enter Text."); 
       p.print(st.nextLine()); 
       p.close(); 
      System.out.println("File has been written successfuly."); 

     } catch (FileNotFoundException ex) { 
      System.out.println("Error!"); 
     } 
} 

這是當我遵守了定界符線

Enter Text. 
    karan is best of the best. 
    File has been written successfuly. 
    Enter string to be found and counted: best 
    The number of times the word best is present is 0 

這是輸出，當我刪除定界符線 輸入文本輸出。

karan is best of the best 
    File has been written successfuly. 
    Enter string to be found and counted: best 
    The number of times the word best is present is 2 
    BUILD SUCCESSFUL (total time: 23 seconds) 

，但我想要的答案爲2，即使我寫 卡蘭是極品中的極品。 在最後注意到句號，我希望編譯器忽略句號並給出答案2，也就是說它也應該在句尾以最好的句號計數單詞。

感謝您的幫助提前。

Answer 1

你需要做一些修改成reader()方法：

• 前while環取出sc.nextLine();，即跳過第一行和光標前進到下一行，如果文件中有它不會工作只有一條線。

• 變化sc.useDelimiter(".");到sc.useDelimiter("\\.");，你需要逃避.字符作爲useDelimiter接受正則表達式和.意味着正則表達式的任何字符。

• 更改if(sc.next().equals(s))到if(sc.next().contains(s))，您只需要檢查string是否存在於該行的任何位置。

下面應該工作：

try { 
    FileReader f = new FileReader("G://1.txt"); 
    Scanner sc = new Scanner(f); 
    Scanner st = new Scanner(System.in); 
    System.out.print("Enter string to be found and counted: "); 
    s = st.nextLine(); 
    System.out.print("\n"); 
    sc.useDelimiter("\\."); 
    while (sc.hasNext()) { 
     if (sc.next().contains(s)) { 

      i++; 
     } 
    } 
    System.out.println("The number of times the word " + s + " is present is " + i); 

} catch (FileNotFoundException ex) { 
    System.out.println("File not found"); 
}