CHALLENGE

ACTIVITY

$4\mathrm{.}6\mathrm{.}1$: For loops and strings.

$528040\mathrm{.}3489528\mathrm{.}9$x$3$zqy$7$

Jump to level $1$

String inputString is read from input. Append each unique character found in inputString to uniqueCharacters in the order that the character first appears.

Ex: If the input is Catalina, then the output is:

Unique characters found: $c,a,t,l,i,n$

Note: inputString.indexOf$($inputString$.$charAt$($i$))==$i returns true if inputString.charAt$($i$)$ occurs the first time at index i of inputString.

import java.util.Scan$$er;

public class ExtractUniqueCharacters $\{$

public static void main$($String$[]$ args$)\{$

Scanner scnr $=$ new Scanner$($

System.in$)$;

String inputString;

int i; I

String uniqueCharacters $=""$;

inputString $=$ scnr$.$nextLine$($