How To Count Occurrences Of Each Character In a String In Java? | Java Basic Examples | Java Inspires

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Hi Guys.

Welcome to JAVA INSPIRES

In this post..we will see 

How To Count Occurrences Of Each Character In a String In Java?

Give string ... "Google Apple Amazon Facebook Microsoft".

JavaBasicExample.java

package com.javainspires;

import java.util.HashMap;
/**
 * 
 * @author Java Inspires
 *
 */
public class JavaBasicExample {

	// lets start
	public static void main(String[] args) {

		// lets take a string
		String inString = "Google Apple Amazon Facebook Microsoft";
		// convert the string to char array
		char[] cArr = inString.toCharArray();

		// create a hashmap - char as Key and Count as Value
		HashMap<Character, Integer> countMap = new HashMap<Character, Integer>();
		// iterate over chararray
		for (char c : cArr) {
			// check for this char in count map
			if (countMap.containsKey(c)) {
				// get count and increment by 1
				int newCount = countMap.get(c) + 1;
				// update new count in the map
				countMap.put(c, newCount);
			} else {
				// put this char in map with count as 1
				countMap.put(c, 1);
			}
		}
		// now print the count map
		countMap.entrySet().stream().forEach(e -> {
			System.out.println(e.getKey() + "=" + e.getValue());
		});

	}
}

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Output:

 =4
A=2
a=2
b=1
c=2
e=3
F=1
f=1
G=1
g=1
i=1
k=1
l=2
m=1
M=1
n=1
o=7
p=2
r=1
s=1
t=1
z=1

THANK YOU

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