java - 计算出现次数的单词长度

Question

我正在编写一个程序来计算每个单词的长度，然后计算该长度出现的次数。

例如:

Enter a String :I love my work
The word count is -
No. of words of length 1 are 1.
No. of words of length 2 are 1.
No. of words of length 4 are 2. 

到目前为止我尝试过这个，

import java.util.Scanner;

class Demo{
    public static void main(String[] args){
        String s;
        Scanner sc=new Scanner(System.in);
        System.out.print("Enter a String :");
        s=sc.nextLine();
        String[] arr = s.split(" ");
        String str = "";
        int [] len = new int[arr.length];
        int [] count = new int[arr.length];
        int c = 0;
        for(int i=0;i<arr.length;i++){
            str = arr[i];
            len[i] = str.length();

            for(int j=0;j<arr.length;j++){
                if(str.length() == arr[j].length()){
                    count[i] = ++c;
                }
            }
            c = 0;
        }

        for(int i=0;i<len.length;i++){

            System.out.println("No. of words of length "+len[i]+" are "+count[i]+".");

        }

    }
}

我的逻辑有问题，这就是为什么它的输出是这样的:

Enter a String :I love my work
    The word count is -
    No. of words of length 1 are 1.
    No. of words of length 2 are 1.
    No. of words of length 4 are 2.
    No. of words of length 4 are 2.

任何建议如何解决这个问题或任何其他更简单的方法来做到这一点(不使用集合， map )。

Answer 1

您可以替换 array与 Map<Integer,Integer> ，这会很容易。

    Scanner sc = new Scanner(System.in);
    System.out.print("Enter a String :");
    String s = sc.nextLine();
    String[] arr = s.split(" ");// get the words
    Map<Integer, Integer> lengthVsCount=new HashMap<>(); // length vs count
    for(String i:arr){ // iterate array
        Integer val=lengthVsCount.get(i.length()); // searching count
        if(val!=null){ // if count is there
            lengthVsCount.put(i.length(),val+1);// increment count by one
        }else{ // count not there
            lengthVsCount.put(i.length(),1); // add count as one
        }
    }
    for (Map.Entry<Integer,Integer> entry:lengthVsCount.entrySet()) {
        System.out.println("No. of words of length " + entry.getKey() + " are " + entry.getValue() + ".");
    }