詢問單詞並檢查其在文本文件中的出現次數

Question

public class Try{ 
public static void main (String args[]) throws IOException { 
    BufferedReader in = new BufferedReader(new FileReader("Try.txt")); 
    Scanner sc = new Scanner(System.in); 
    System.out.print("Enter the subtring to look for: "); 
    String Word=sc.next(); 
    String line=in.readLine(); 
    int count =0; 
    String s[]; 
    do 
    { 
     s=line.split(" "); 
     for(int i=0; i < s.length; i++) 
     { 
      String a = s[i]; 
      if(a.contains(Word)) 
       count++; 
     } 
     line=in.readLine(); 
    }while(line!=null); 
    System.out.print("There are " +count+ " occurences of " +Word+ " in "); 
    java.io.File file = new java.io.File("Try.txt"); 
    Scanner input = new Scanner(file); 
    while(input.hasNext()) 
    { 
      String word = input.nextLine(); 
      System.out.print(word); 
    } 

    } 
} 

我的程序的預期用途是要求用戶輸入將在文本文件中檢查的特定單詞並且是否存在它會計算用戶輸入的單詞在文本文件中出現的次數。到目前爲止，我的程序只能搜索一個單詞。如果我嘗試用空格分隔兩個單詞，則只會搜索第一個單詞並計算其出現次數。有關如何搜索多個單詞的任何提示？

Answer 1

我下面硬是問題的標題，所以我會建議這個算法：

public static void main(String[] args) throws IOException { 
    BufferedReader in = new BufferedReader(new FileReader("Test.txt")); 
    Scanner sc = new Scanner(System.in); 
    System.out.print("Enter the subtring to look for: "); 
    String word = sc.next(); 
    String line = in.readLine(); 
    int count = 0; 
    // here is where the efficiently magic happens 
    do { 
    // 1. you dont need to split a line by spaces, too much overhead... 
    // 2. and you dont need to do counter++ 
    // 3. do instead: calculate the number of coincidences that the word is 
    //repeated in a whole line...that is what the line below does.. 
     count += (line.length() - line.replace(word, "").length())/word.length(); 
    //the rest looks fine 

    //NOTE: if you need a whole word then wrap the input of the user and add the empty spaces at begin and at the end...so the match will be perfect to a word 

     line = in.readLine(); 
    } while (line != null); 
    System.out.print("There are " + count + " occurences of " + word + " in "); 
    } 

---

編輯：

，如果你想在文檔中檢查多個單詞，然後使用這個

public static void main(String[] args) throws IOException { 
    BufferedReader in = new BufferedReader(new FileReader("Test.txt")); 
    Scanner sc = new Scanner(System.in); 
    System.out.print("Enter the subtring to look for: "); 
    String input = sc.nextLine(); 
    String[] word = input.split(" "); 
    String line = in.readLine(); 
    int count = 0; 
    do { 
     for (String string : word) { 
      count += (line.length() - line.replace(string, "").length())/string.length(); 
     } 

     line = in.readLine(); 
    } while (line != null); 
    System.out.print("There are " + count + " occurences of " + Arrays.toString(word) + " in "); 
}