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In this tutorial, I am going to show you the most important question in Java Interview. How to find duplicate words count in a file.
Input : Give a Text file with duplicate words like below :
Java 8 Tutorials Java 8 Examples Online Tutorials Point Java 7 Examples Java 7 try with resources example
Output :
examples -> 2
java8 -> 2
tutorials -> 2
java7 -> 2
with -> 1
online -> 1
resources -> 1
try -> 1
point -> 1
example -> 1
Find Duplicate Words Count in a File :
package com.onlinetutorialspoint.javaprograms;
import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;
import java.util.StringTokenizer;
public class DuplicateWordsCount {
public Map<String, Integer> getMapWithCount(String fileName) {
Map<String, Integer> map = new HashMap<String, Integer>();
try (FileInputStream fis = new FileInputStream(fileName);
DataInputStream dis = new DataInputStream(fis);
BufferedReader br = new BufferedReader(new InputStreamReader(
dis))) {
String line = null;
while ((line = br.readLine()) != null) {
StringTokenizer st = new StringTokenizer(line, " ");
while (st.hasMoreTokens()) {
String tmp = st.nextToken().toLowerCase();
if (map.containsKey(tmp)) {
map.put(tmp, map.get(tmp) + 1);
} else {
map.put(tmp, 1);
}
}
}
} catch (IOException e) {
e.printStackTrace();
}
return map;
}
public static void main(String a[]) {
DuplicateWordsCount mdc = new DuplicateWordsCount();
Map<String, Integer> wordMap = mdc
.getMapWithCount("/home/chandrashekhar/Desktop/sample.txt");
wordMap.entrySet().stream().sorted(Map.Entry.<String, Integer>comparingByValue().reversed()
).forEachOrdered((entry)->System.out.println(entry.getKey() +" -> "+entry.getValue()));
}
}
Recommended : try with resources in Java 7
Recommended : How to sort a map in Java 8
examples -> 2
java8 -> 2
tutorials -> 2
java7 -> 2
with -> 1
online -> 1
resources -> 1
try -> 1
point -> 1
example -> 1
Happy Learning 🙂
