[Solved] How tho check in Java if there is same characters in a String? [closed]

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You can do it using a Set. You need unique elements and Set gurantees you containing the unique elements. HashSet is implementation of Set, you can use it to implement this idea. 

public boolean ifAllCharsUnique(String input){
    char[] arr = input.toCharArray();
    int length = arr.length;
    Set<Character> checker = new HashSet<>();
    for(int i =0 ; i < length; i++){
         if(checker.contains(arr[i]){
               return false;
         }
         checker.add(arr[i]);
    }
    return true;
}

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solved How tho check in Java if there is same characters in a String? [closed]