Question: Implement an algorithm with Java to determine if a string has all unique characters. You can assume that the string only contains ASCII characters, and

Implement an algorithm with Java to determine if a string has all unique characters. You can assume that the string only contains ASCII characters, and there are 128 ASCII characters in total. What is the time complexity of your solution? Can you do better?

boolean isUniqueChars (String str) { .... }

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