In Post, we will write a couple of java programs to find the frequency of each character in String?
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package com.kkjavatutorials.client; import java.util.LinkedHashMap; import java.util.Map; /** * Java Program to find the frequency of each character in String ? * @author KK JavaTutorials * */ public class CountCharacterFrequencyInString_1 { public static void main(String[] args) { String inputText = "aabb abc"; findEachCharacterCounts(inputText); } private static void findEachCharacterCounts(String inputText) { if(inputText == null) { System.out.println("Enter Valid Text"); return; } Map<Character,Integer> charMapCount = new LinkedHashMap<>(); char[] charArray = inputText.toCharArray(); for (char c : charArray) { if(c == ' ') continue; if(charMapCount.containsKey(c)) { charMapCount.put(c, charMapCount.get(c)+1); }else { charMapCount.put(c, 1); } } charMapCount.forEach((k,v)->System.out.println(k+":"+v)); } } |
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package com.kkjavatutorials.client; import java.util.LinkedHashMap; import java.util.Map; /** * Java Program to find the frequency of each character in String ? * @author KK JavaTutorials * */ public class CountCharacterFrequencyInString_2 { public static void main(String[] args) { String inputText = "aabb abc"; findEachCharacterCounts(inputText); } private static void findEachCharacterCounts(String inputText) { if(inputText == null) { System.out.println("Enter Valid Text"); return; } Map<Character,Integer> charMapCount = new LinkedHashMap<>(); char[] charArray = inputText.toCharArray(); for (char c : charArray) { if(c == ' ') continue; //Below methods are only available from JDK 1.8 onwards charMapCount.computeIfPresent(c, (k,v)->v+1); charMapCount.computeIfAbsent(c, v->1); } charMapCount.forEach((k,v)->System.out.println(k+":"+v)); } } |
Output of above both programs:
a:3
b:3
c:1
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