How to find a given String have all Unique character.

How to find a given String have all Unique character.

SOURCE : StringUniqueChar.java

public class StringUniqueChar {

	public static boolean isbool(String s) {

		boolean[] char_set = new boolean[256];

		for (int i = 0; i < s.length(); i++) {

			int val = s.charAt(i);

			if (char_set[val]) {

				return false;
			}
			char_set[val] = true;
		}

		return true;

	}

	public static void main(String[] args) {

		String s = "this";

		isbool(s);
		System.out.println(isbool(s));
	}

}

INPUT

	String s = "this"

OUTPUT

true

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