In this example I will show you how to count the occurrences of each character in a given string.
For this we use HashMap. key for HashMap is the character and value is the number of occurrences.
How to write an immutable Class in Java
For this we use HashMap. key for HashMap is the character and value is the number of occurrences.
public static void main(String[] args) { char[] ch = name.toLowerCase().toCharArray(); HashMap<Character, Integer> map = new HashMap<>(); for (int i = 0; i < ch.length; i++) { if (map.containsKey(ch[i])) { map.put(ch[i], map.get(ch[i]) + 1); } else { map.put(ch[i], 1); } } System.out.println(map); }Output of the program
{v=1, =1, t=1, r=1, a=2, n=1, o=2, m=1, j=1, i=1}
How to write an immutable Class in Java
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