CareerCup 1.1

UniqueChar.java

//test if a string is consist of a sequence of all unique characters
public class UniqueChar {

	public static boolean isUnique(String x) {
		
		if (x.length() > 256)
			return false;
		boolean[] b = new boolean[256];
		
		for(int i=0; i<x.length(); i++) {
			int value = x.charAt(i);
			if (b[value])
			return false;
			b[value] = true;
		}
		return true;
	}
	
	public static void main (String[] args) {
		String s = args[0];
		System.out.println(isUnique(s));
	}
	
}