Hi Friend,

Try the following code:

import java.io.*;
import java.awt.*;
import java.util.*;
import javax.swing.*;

class CountCharacters {
public static void main(String[] args) throws Exception{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Please enter string ");
System.out.println();
String str=br.readLine();
String st=str.replaceAll(" ", "");

char[]third =st.toCharArray();
for(int counter =0;counter<third.length;counter++){
char ch= third[counter];
int count=0;
for ( int i=0; i<third.length; i++){
if (ch==third[i])
count++;
}
boolean flag=false;
for(int j=counter-1;j>=0;j--){
if(ch==third[j])
flag=true;
}
if(!flag){
System.out.println("Character :"+ch+" occurs "+count+" times ");
}
}
}
}

Hope that it will be helpful for you.
Thanks