Counter java code example

Example 1: counter in java

HashMap<String, MutableInteger> efficientCounter = new HashMap<String, MutableInteger>();
 
for (String a : sArr) {
	MutableInteger initValue = new MutableInteger(1);
	MutableInteger oldValue = efficientCounter.put(a, initValue);
 
	if(oldValue != null){
		initValue.set(oldValue.get() + 1);
	}
}

Example 2: java count

public static void main(String[] args) 
    { 
  
        // creating a list of Integers 
        List<Integer> list = Arrays.asList(0, 2, 4, 6, 
                                           8, 10, 12); 
  
        // Using count() to count the number 
        // of elements in the stream and 
        // storing the result in a variable. 
        long total = list.stream().count(); 
  
        // Displaying the number of elements 
        System.out.println(total); 
    }