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ConsecutiveOccurenceOfCharacters.java
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ConsecutiveOccurenceOfCharacters.java
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package String;
import java.util.ArrayList;
import java.util.List;
/**
* We are going to count the consecutive occurrences of the characters in a given string.
* The character may repeat multiple time with different consecutive counts.
*
* Characters count should not be case sensitive. Lets look at some of the examples.
*
* Ex1: Input: aahnmkhhlkknjm
* Output: a : 2, h : 1, n : 1, m : 1, k : 1, h : 2, l : 1, k : 2, n : 1, j : 1, m : 1
*
* Ex2: Input: recommended
* Output: r : 1, e : 1, c : 1, o : 1, m : 2, e : 1, n : 1, d : 1, e : 1, d : 1
*
* Ex3: Input: recoMmended
* Output: r : 1, e : 1, c : 1, o : 1, m : 2, e : 1, n : 1, d : 1, e : 1, d : 1
*
*/
public class ConsecutiveOccurenceOfCharacters {
public static List<String> getConsecutiveOccurrenceOfChar(String str) {
List<String> result = new ArrayList<>();
char current = str.charAt(0);
int count = 1;
for(int i = 1; i < str.length(); i++) {
char c = str.charAt(i);
if(current == c) {
count++;
} else {
result.add(current + " : " + count);
count = 1;
current = c;
}
}
result.add(current + " : " + count);
return result;
}
public static void main(String[] args) {
System.out.println(getConsecutiveOccurrenceOfChar("aaaabbbcca"));
}
}