java - 如何计算字符串数组中字符串的重复次数

Question

我正在尝试计算一个单词在标准输入中重复的次数。

输入示例:

This is a test, this is is

期望的输出:

this 2
is   3 
a    1
test 1

我有一个 int[] 来存储 wordCount 但我不确定在哪里使用它，int 计数只是临时的，以便程序可以运行。

这是我的引用代码:

import java.util.Scanner;
public class  WCount {

    public static void main (String[] args) {

        Scanner stdin = new Scanner(System.in);

        String [] wordArray = new String [10000];
        int [] wordCount = new int [10000];
        int numWords = 0;

        while(stdin.hasNextLine()){
            String s = stdin.nextLine();
            String [] words =  s.replaceAll("[^a-zA-Z ]", "").toLowerCase().split("\\\
s+"); //stores strings as words after converting to lowercase and getting rid of punctuation 
            for(int i = 0; i < words.length; i++){
        int count = 0; //temporary so program can run
            for(int  j = 0; j < words.length; j++){
            if( words[i] == words[j] )
        count++;
                    System.out.println("word count: → " + words[i] + " " +  count);
}
               }

    }

Answer 1

我会使用这样的东西:

import java.util.ArrayList;
import java.util.Scanner;

public class WCount  {

    public static void main(String[] args) {

        Scanner stdin = new Scanner(System.in);

        String[] wordArray = new String[10000];
        int[] wordCount = new int[10000];
        int numWords = 0;           

        while (stdin.hasNextLine()) {
            String s = stdin.nextLine();
            ArrayList<String> noDuplicated = new ArrayList<String>();
            String[] words = s.replaceAll("[^a-zA-Z ]", "").toLowerCase()
                    .split("\\s+"); // stores strings as words after converting
                                    // to lowercase and getting rid of
                                    // punctuation

            //Array that contains the words without the duplicates ones
            for (int i = 0; i < words.length; i++) {
                if(!noDuplicated.contains(words[i]))
                    noDuplicated.add(words[i]); 
            }

            //Count and print the words
            for(int i=0; i<noDuplicated.size();i++){
                int count = 0;
                for (int j = 0; j < words.length; j++) {
                    if (noDuplicated.get(i).equals(words[j]))
                        count++;                    
                }
                System.out.println("word count: → " + words[i] + " "
                            + count);
            }

        }
    }
}

输出:

This is a test, this is is
word count: → this 2
word count: → is 3
word count: → a 1
word count: → test 1

希望有用!