Java: Print a unique character in a string

Question

I\'m writing a program that will print the unique character in a string (entered through a scanner). I\'ve created a method that tries to accomplish this but I keep getting

Answer 1

Here str will be your string to find the unique characters.

function getUniqueChars(str){
let uniqueChars = '';
for(let i = 0; i< str.length; i++){
  for(let j= 0; j< str.length; j++) {
    if(str.indexOf(str[i]) === str.lastIndexOf(str[j])) {
       uniqueChars += str[i];
     }
   }
 }
 return uniqueChars;    

}