java - 输入一个句子并检查它是否包含用户输入的任何单词，同时打印计数

Question

我正在用 java 开发一个程序，输出应该如下所示:

Input the sentence
hello how how are you
enter code here

Input the word that has to be searched
how

Output : 
the string is present and the count of the string how is : 2

I have written a program but i am not able to count the search string can anyone please help me on this and below is the code

我认为循环也存在问题，我能够找到句子中存在的字符串但无法计数。

        boolean contains = false;

        /*Inputting the sentence*/
        java.util.Scanner scn = new java.util.Scanner(System.in);

        System.out.println("Input the sentence");
        String s = scn.nextLine();
        String[] lstarr = s.split(" ");

        /*Inputting the string*/
        java.util.Scanner scn2 = new java.util.Scanner(System.in);

        System.out.println("Input the word to be searched");
        String s2 = scn.nextLine();
        String[] explst = s2.split(" ");

        /*searching the input word */
        if(s.contains(s2)){    
            contains = true;
            System.out.println("Input word is present : " + s2);
        }

        else{

            System.out.println("String " + s2 + "is not present");
        }

        ArrayList<String> lst = new ArrayList<String>();

        Collections.addAll(lst, lstarr);

        for(String str : lst) {

            System.out.println(str + " " + Collections.frequency(lst, str));

        }
    }

Answer 1

试试下面的代码:

public static void main(String[] args) {

     System.out.println("Input the sentence");
     Scanner s = new Scanner(System.in);
     String input = s.nextLine();

     System.out.println("Input the word that has to be searched");
     String word = s.nextLine();

     String str = "";
     int occurance = 0;
     for(char c : input.toCharArray()) {
         str += c;
         if(str.length() == word.length()) {
             if(str.equals(word)) {
                 occurance ++;
             }

             str = str.substring(1);
         }
     }

     if(occurance > 0)
         System.out.println("the string is present and the count of the given string is : " + occurance);
     else 
         System.out.println("The string is not present");
}