how to find occurrence of words in string code example

Example 1: 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");
    }

Example 2: check how many of a word is in a string

function countOccurences(str,word)  
{ 
    // split the string by spaces in a 
    String a[] = str.split(","); 
  
    // search for pattern in a 
    int count = 0; 
    for (int i = 0; i < a.length; i++)  
    { 
    // if match found increase count 
    if (word.equals(a[i])) 
        count++; 
    } 
  
    return count; 
}