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Mülakat sorusu olarak soruldu. Geleneksel Yöntem, Collection Yöntem, Lambda Yöntemi.
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class StringUtil { | |
// "baba" a:2, b:2 tane var gibi mesela. | |
public static HashMap<Character, Integer> countOccurencesWithHashMapWay(String str) | |
{ | |
char [] strArray = str.toCharArray(); | |
HashMap<Character, Integer> hm = new HashMap<>(); | |
for (char ch : strArray) | |
if (hm.containsKey(ch)) | |
hm.put(ch, hm.get(ch) + 1); | |
else | |
hm.put(ch, 1); | |
return hm; | |
} | |
} |
public static int [] countOccurencesWithFrequencyArrayTradionatalWay(String str)
{
int [] result = new int['z' + 1];
char [] chars = str.toCharArray();
for (char ch : chars)
result[ch - 'A']++;
return result;
}
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public static HashMap<Character, Integer> countOccurencesWithHashMapWayLambda(String str)
{
}