Here is a Java program to count the occurrence of each character if a string. In this java program, we have to count the frequency of occurrence of each character of a string and then print it on screen.
For Example,Input String : Apple A : 1 times e : 1 times l : 1 times p : 2 times
To count the frequency of each alphabet, we will first take a string as input from user. We will use an integer array of length 256 to count the frequency of characters.
Initialize frequency array element with zero, which means initially the count of all characters are zero.
Using a for loop, traverse input string and increment the count of every character of input string. Finally, traverse the frequency array and print the frequency of every character.
Java program to count each character of a string
package com.tcc.java.programs;
import java.util.Scanner;
public class CharacterCount {
public static void main(String args[]) {
String str;
int i, length, counter[] = new int[256];
Scanner scanner = new Scanner(System.in);
System.out.println("Enter a String");
str = scanner.nextLine();
length = str.length();
for (i = 0; i < length; i++) {
counter[(int) str.charAt(i)]++;
}
for (i = 0; i < 256; i++) {
if (counter[i] != 0) {
System.out.println((char) i + "
--> " + counter[i]);
}
}
}
}
Output
Enter a String APPLE A --> 1 E --> 1 L --> 1 P --> 2
Enter a String TECHCRASHCOURSE A --> 1 C --> 3 E --> 2 H --> 2 O --> 1 R --> 2 S --> 2 T --> 1 U --> 1
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