如何计算队列中一个单词的字母数量？

Question

So I am given a problem in which i have to find the specific amount of letters in a word that is from a queue, for example an apple has 2 letter p's, so i would have to print out eg "The total amount of letters in the word that start with p:2". After that, i have no idea how to print out and count the specific letters. My teacher has recommended me to use the arraylist method to count the letters, but i still do not know how to do it. Forgive me if my codes look messy, i am still quite new to programming. Here are some of my codes so far:

package fruits;
import java.util.Scanner;
import java.util.ArrayList;
import java.util.*;

public class Fruits {

    public static void main(String[] args) {
        Queue myQueue = new Queue(80);
        for (int j = 0; j < num; j++) {
            System.out.println("Enter the fruits you like to eat" + j + ":");
            String input = sc.nextLine();
            myQueue.enqueue(input);//enqueue the fruits

        }
        System.out.println("List of Fruits i like to eat: ");                     
        for (int x = 0; x < num; x++) {
            System.out.print(x);
            if (!myQueue.isEmpty()) {
                String input = (String) myQueue.dequeue();
                System.out.println(input);
            }
        }

        ArrayList<Queue> list = new ArrayList<Queue>();
        list.add(myQueue);
        System.out.println("Fruits that start with a letter p:");
    }
}

Answer 1

如果HashMap中已经存在Key，则使用HashMap<String,Integer>和Increment count

Answer 2

as this is homework, here are some hints:

• take care to Queue usage: you can either put things inside or pop them only once . Therefore, myQueue is empty when you do the second for loop (for printing them). That could give you a hint on why an ArrayList would be useful.
• As you know how to loop over items from a Queue , you just need to count the letters, word after word, and keep track of it. Answer from rupesh_padhye gives you a good way to do it.