MapRunner.java - Number of occurrences in a given string

MapRunner.java

package collections;

import java.util.LinkedHashMap;

public class StringRunner {

	public static void main(String[] args) {
		String str = "This is a great thing";
		String[] arr = str.toLowerCase().replaceAll("\\s", "").split("");
		LinkedHashMap<String, Integer> arrayMap = new LinkedHashMap<>();

		for (String a : arr) {
			int value = 1;
			if (!arrayMap.containsKey(a)) {
				arrayMap.put(a, value);
			} else {
				int index = arrayMap.get(a);
				index++;
				arrayMap.put(a, index);
			}
		}
		System.out.println(arrayMap);
	}

}