Write a program to count the number of repeating characters in a string.

Question

Accepted Answer

This program counts the number of repeating characters in a given string.

Iterate through each character in the string
Use a hash map to store the count of each character
If a character is already present in the hash map, increment its count
Finally, iterate through the hash map and print the characters with their counts

Accepted Answer

Try using a hashmap :

HashMap map=new HashMap();

String str="abababaccdef";

int len=str.length();

for(int i=0;i<=len-1;i++)

{

if(map.containsKey(str.charAt(i)))

{

map.put(str.charAt(i),map.get(str.charAt(i))+1);

}

else

{

map.put(str.charAt(i),1);

}

System.out.println(map);