can anyone help me to explain on how to solve this question (SortChar)

Question

Write a java class with name SortChar to do the character sorting base on the character input and also display the character numbering.
For example
Input: APPLE
Output result:
AELPP
A=1 (1)
E=5 (1) Five is the location of the char, (One is total char count).
L=12 (1)
P=16 (2)
• System should able to support up to 20 characters.
• Support small and capital letter
• Not need to support symbols and system require doing the validation.

Answer 1

import java.util.ArrayList;

class SortChar {
public static void main(String[] args) {
SortChar sc = new SortChar();
int arr[]=sc.sort("ap8p6le");
sc.print(arr);
}

public int[] sort(String str){
int[] arr = new int[26];
str = str.toUpperCase();

for(int i=0; i<str.length(); i++){
if((str.charAt(i)>='A' && str.charAt(i)<='Z') || (str.charAt(i)>='a' && str.charAt(i)<='z')){
int indx=str.charAt(i)-'A';
arr[indx]++;
}
}
return arr;
}

public void print(int[] arr){
for(int i=0;i<26;i++){
if(arr[i] > 0)
System.out.println((char)(i+'A') + "("+ (i+1) + ")"+":" +arr[i]);
}
}
}
note that every input will result in only upper case letters

Answer 2

my pleasure :)

Answer 3

Thank you very much