What can be a reason of that? I don't see any infinite loops here.
package com.codegym.task.task10.task1016;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;
/*
Identical words in a list
*/
public class Solution {
public static void main(String[] args) throws Exception {
BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
ArrayList<String> words = new ArrayList<String>();
for (int i = 0; i < 20; i++) {
words.add(reader.readLine());
}
Map<String, Integer> map = countWords(words);
for (Map.Entry<String, Integer> pair : map.entrySet()) {
System.out.println(pair.getKey() + " " + pair.getValue());
}
}
public static Map<String, Integer> countWords(ArrayList<String> list) {
HashMap<String, Integer> result = new HashMap<String, Integer>();
for (String word: list) {
result.put(word, 0);
}
for (String word: list) {
if (result.containsKey(word)) {
result.put(word, result.get(word) + 1);
}
}
return result;
}
}