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Added isUnique Method #6

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Added isUnique Method #6

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18 changes: 18 additions & 0 deletions src/Main.java
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Original file line number Diff line number Diff line change
@@ -1,3 +1,5 @@
import java.util.HashMap;

//TIP To <b>Run</b> code, press <shortcut actionId="Run"/> or
// click the <icon src="AllIcons.Actions.Execute"/> icon in the gutter.
public class Main {
Expand All @@ -12,4 +14,20 @@ public static void main(String[] args) {
System.out.println("i = " + i);
}
}

public static Boolean isUnique(String input) {
if (!input.isEmpty()) {
input = input.toLowerCase();
HashMap<Character, Integer> uniqueCharacters = new HashMap<>();
for (int i = 0; i < input.length(); i++) {
if (uniqueCharacters.containsKey(input.charAt(i))) {
System.out.println(input.charAt(i));
return false;
} else {
uniqueCharacters.put(input.charAt(i), 1);
}
}
}
return true;
}
}