In this tutorial, we will be learning the writing a java program to count the duplicate characters in the string. Basically, for a given string we have to print all duplicate characters with their occurrence.
For example:
Suppose the String input given by the user are : TutorialWorldTutorial
So the output should be
T = 2
u = 2
t = 2
o = 3
r = 3
i = 2
a = 2
l = 3
Program 1: Java Program to count the occurrence of duplicate characters in String
[java]
import java.util.*;
public class Main
{
public static void main(String[] args) {
Scanner sc= new Scanner(System.in);
System.out.print(“Please enter a string: “);
String str= sc.nextLine();
int count, douplicateCount = 0;
char strArr[] = str.toCharArray();
System.out.println(“Occurrence of the Duplicate characters in string: “);
for(int i = 0; i < strArr.length; i++) {
count = 1;
for(int j = i+1; j <strArr.length; j++) {
if(strArr[i] == strArr[j] && strArr[i] != ‘ ‘) {
count++;
douplicateCount++;
strArr[j] = ‘0’;
}
}
if(count > 1 && strArr[i] != ‘0’)
System.out.println(strArr[i]+” = “+count);
count = 1;
}
}
}
[/java]
Output
