Find specific word in text file and count it

Question

someone can help me with code? How to search in text file any word and count how many it were repeated?

For example test.txt:

hi
hola
hey
hi
bye
hoola
hi

And if I want to know how many times are repeated in test.txt word "Hi" program must say "3 times repeated"

I hope you understood what I want, thank you for answers.

Answer 1

Apache Commons - StringUtils.countMatches()

Answer 2

package somePackage;   
public static void main(String[] args) {

            String path = ""; //ADD YOUR PATH HERE
            String fileName = "test2.txt";
            String testWord = "Macbeth"; //CHANGE THIS IF YOU WANT
            int tLen = testWord.length();
            int wordCntr = 0;
            String file = path + fileName;
            boolean check;

            try{
                FileInputStream fstream = new FileInputStream(file);
                BufferedReader br = new BufferedReader(new InputStreamReader(fstream));
                String strLine;        
                //Read File Line By Line
                while((strLine = br.readLine()) != null){                
                    //check to see whether testWord occurs at least once in the line of text
                    check = strLine.toLowerCase().contains(testWord.toLowerCase());
                    if(check){                    
                        //get the line, and parse its words into a String array
                        String[] lineWords = strLine.split("\\s+");                    
                        for(String w : lineWords){
                            //first see if the word is as least as long as the testWord
                            if(w.length() >= tLen){
                                /*
                                1) grab the specific word, minus whitespace
                                2) check to see whether the first part of it having same length
                                    as testWord is equivalent to testWord, ignoring case
                                */
                                String word = w.substring(0,tLen).trim();                                                        
                                if(word.equalsIgnoreCase(testWord)){                                
                                    wordCntr++;
                                }                            
                            }
                        }                    
                    }   
                }            
                System.out.println("total is: " + wordCntr);
            //Close the input stream
            br.close();
            } catch(Exception e){
                e.printStackTrace();
            }
        }

Answer 3

try using java.util.Scanner.

public int countWords(String w, String fileName) {
int count = 0;
Scanner scanner = new Scanner(inputFile);
scanner.useDelimiter("[^a-zA-Z]"); // non alphabets act as delimeters
String word = scanner.next();
if (word.equalsIgnoreCase(w))
    count++;
   return count;
}

Answer 4

public int occurrencesOfHi()
{
    String newText = Text.replace("Hi","");
    return (Text.length() - newText.length())/2;
}

Answer 5

Try it this way with Pattern and Matcher.

import java.io.BufferedReader;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class Dem {

    public static void main(String[] args){

        try {
            File f = new File("d://My.txt");
            FileReader fr = new FileReader(f);
            BufferedReader br = new BufferedReader(fr);
            String s = new String();

            while((s=br.readLine())!=null){

                s = s + s;

            }

            int count = 0;
            Pattern pat = Pattern.compile("it*");
            Matcher mat = pat.matcher(s);

            while(mat.find()){

                  if(mat.find()){

                      mat.start();
                      count++;

                  }

            }

            System.out.println(count);
        } catch (Exception e) {

            e.printStackTrace();
        }
    }

}

Answer 6

HashMap h=new HashMap();                        
FileInputStream fin=new FileInputStream("d:\\file.txt");
BufferedReader br=new BufferedReader(new InputStreamReader(fin));
String n;
while((n=br.readLine())!=null)
{
    if(h.containsKey(n))
    {
    int i=(Integer)h.get(n);
    h.put(n,(i+1));
    }
    else
    h.put(n, 1);
}

now iterate through this map to get the count for each word using each word as a key to the map values