count occurrences of character in string java 8
String someString = "elephant";
long count = someString.chars().filter(ch -> ch == 'e').count();
assertEquals(2, count);
long count2 = someString.codePoints().filter(ch -> ch == 'e').count();
assertEquals(2, count2);how to find occurrence of words in string
HOW TO COUNT OCCURRENCE OF THE WORDS IN STRING
(It can also be solved by using nested for loops...)
String str = "I am happy and why not and why are you not happy you should be";
String [] arr = str.split(" ");
Map<String, Integer> map = new HashMap<>();
for (int i=0 ; i < arr.length ; i++){
if (!map.containsKey(arr[i])){
map.put(arr[i],1);
} else{
map.put(arr[i],map.get(arr[i])+1);
}
}
for(Map.Entry<String, Integer> each : map.entrySet()){
System.out.println(each.getKey()+" occures " + each.getValue() + " times");
}number of occurrences of character in string
public class CountStringOccurence {
public static void main(String[] args) {
int count= countOccurences("aaassssddadad",'s');
System.out.println(count);
}
private static int countOccurences(String word, char character){
int count = 0;
for(int i = 0; i < word.length(); i++){
if(word.chartAt(i) == character){
count++; }
}
return count;
}
}Copyright © 2021 Codeinu
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