Find frequency of keyword in Java

 This program checks the frequency of a keyword in any .txt file

• Start your IDE 
• Type in a class named Frequency :

import java.io.File;

import java.io.FileNotFoundException;

import java.util.Scanner;

public class Frequency {

public static void main(String[] args) throws FileNotFoundException {

Scanner scan2=new Scanner(System.in);

String src="";

System.out.println("Enter main file path (Only .txt files approved)");

for (;;){

src=scan2.nextLine();

if (new File(src).exists()==true){break;}

System.out.println("Your file doesn't exist. Please try again.");

}System.out.println("-----------------------------------------------------------------------");

System.out.println("Welcome to Frequency");

System.out.println("-----------------------------------------------------------------------");

for (;;){

Scanner scan=new Scanner(new File(src));

System.out.println("Enter the word that you want to find: (Type $END$ to terminate program.)");

String chr=scan2.next().replace("\"", "");

if (chr.equals("$END$")){System.out.println("Terminating program...");System.out.println("Terminated");break;}

chr=chr.replace("?", "");

chr=chr.replace(";", "");

chr=chr.replace("!", "");

chr=chr.replace(",", "");

chr=chr.replace("'", "");

chr=chr.replace("’", "");

chr=chr.replace(".", "");

chr=chr.replace(":", "");

chr=chr.replace("(", "");

chr=chr.replace(")", "");

chr=chr.replace("]", "");

chr=chr.replace("[", "");

chr=chr.replace("{", "");

chr=chr.replace("}", "");

chr=chr.replace("-", "");

chr=chr.replace("@", "");

chr=chr.replace("%", "");

chr=chr.replace("*", "");

chr=chr.replace("#", "");

chr=chr.replace("`", "");

chr=chr.replace("~", "");

chr=chr.replace("/", "");

chr=chr.replace("\\", "");

chr=chr.replace(">", "");

chr=chr.replace("<", "");

double frq=0;

double total=0;

String y="";

while (scan.hasNext()){

y=scan.next().replace("\"", "");

y=y.replace("?", "");

y=y.replace(";", "");

y=y.replace("!", "");

y=y.replace(",", "");

y=y.replace("’", "");

y=y.replace("'", "");

y=y.replace(".", "");

y=y.replace(":", "");

y=y.replace("(", "");

y=y.replace(")", "");

y=y.replace("]", "");

y=y.replace("[", "");

y=y.replace("{", "");

y=y.replace("}", "");

y=y.replace("-", "");

y=y.replace("@", "");

y=y.replace("%", "");

y=y.replace("*", "");

y=y.replace("#", "");

y=y.replace("`", "");

y=y.replace("~", "");

y=y.replace("/", "");

y=y.replace("\\", "");

y=y.replace(">", "");

y=y.replace("<", "");

//System.out.println(y); Just to see result

total++;

if (y.equalsIgnoreCase(chr)){frq++;}

}

System.out.println("Word appears "+frq+" times");

System.out.println("The word has an appearance frequency in the text of "+frq/total*100+"%");

System.out.println("-----------------------------------------------------------------------");}

}

}

• Execute the code