询问单词并检查其在文本文件中的出现次数

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); 
    } 

    } 
} 

我的程序的预期用途是要求用户输入将在文本文件中检查的特定单词并且是否存在它会计算用户输入的单词在文本文件中出现的次数。到目前为止，我的程序只能搜索一个单词。如果我尝试用空格分隔两个单词，则只会搜索第一个单词并计算其出现次数。有关如何搜索多个单词的任何提示？

Answer 1

我下面硬是问题的标题，所以我会建议这个算法：

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 "); 
    } 

---

编辑：

，如果你想在文档中检查多个单词，然后使用这个

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 "); 
}