Using an array to input strings, and another one to output word frequency-CodePudding

So I am trying to complete this code. The goal is to input an array of strings, then count the frequency of how often the words are found. For example:

input:

joe 
jim 
jack
jim
joe

output:

joe 2
jim 2
jack 1
jim 2
joe 2

An array must be chosen for Strings, and another array much be chosen for word frequency.

My code so far:

I am stuck into trying to implement this. The string method is set, but how am I going to count the frequency of words, and also assign those values to an array. Then print both side by side. I do know that once the integer array is set. We can simply do a for loop to print the values together such as. System.out.println(String[i] " " countarray[i]);

public class LabClass {

    public static int getFrequencyOfWord(String[] wordsList, int listSize, String currWord) {
        int freq = 0;

        for (int i = 0; i < listSize; i  ) {
            if (wordsList[i].compareTo(currWord) == 0) {
                freq  ;
            }
        }

        return freq;
    }

    public static void main(String[] args) {
        LabClass scall = new LabClass();
        Scanner scnr = new Scanner(System.in);

        // assignments 
        int listSize = 0;
        System.out.println("Enter list Amount");

        listSize = scnr.nextInt();
        // removing line to allow input of integer
        int size = listSize;   // array length

        // end of assignments
        String[] wordsList = new String[size];  // string array

        for (int i = 0; i < wordsList.length; i  ) {  //gathers string input
            wordsList[i] = scnr.nextLine();
        }

        for (int i = 0; i < listSize; i  ) {
            String currWord = wordsList[i];
            int freqCount = getFrequencyOfWord(wordsList, listSize, currWord);
            System.out.println(currWord   " "   freqCount);
        }
    }

}

CodePudding user response：

int some_method(String[] arr, String word) {
    int count = 0;
    for (int i=0; i<arr.size(); i  ) {
        if (arr[i].equals(word)) count  ;
    }
    return count;
}

Then in main method:

String[] array = ["joe", "jake", "jim", "joe"] //or take from user input

int[] countArray = new int[array.size()]

for (int i=0; i<array.size(); i  ) {
    countArray[i] = some_method(array, array[i])    
}

System.out.println(array[0]   " "   countArray[0]);

Ouput: joe 2

CodePudding user response：

public class LabClass {

    public static void main(String... args) {
        Scanner scan = new Scanner(System.in);

        System.out.print("Enter list Amount: ");
        String[] words = new String[scan.nextInt()];

        System.out.println("Enter words:");

        for (int i = 0; i < words.length; i  )
            words[i] = scan.nextLine();

        Map<String, Long> histogram = calculateFrequency1(words);
        histogram.forEach((word, count) -> System.out.println(word   ' '   count));
    }

    public static Map<String, Long> calculateFrequency1(String[] words) {
        return Arrays.stream(words).collect(Collectors.groupingBy(Function.identity(),
                Collectors.counting()));
    }

    public static Map<String, Long> calculateFrequency2(String[] words) {
        Map<String, Long> histogram = new HashMap<>();

        for (String word : words)
            histogram.put(word, histogram.getOrDefault(word, 0L)   1);

        return histogram;
    }

}