cc150 - 1.1 UniqueCharChecker

_01_01.java

package cc150;

import java.util.*;

public class _01_01 {
	
	public static void main(String[] args) {
		System.out.println(_01_01.allCharUnique("abcdefghijklmnopqrstuvwxyz!@#$%^&*()"));
		System.out.println(_01_01.allCharUnique("abcdefghii"));
		System.out.println(_01_01.allCharUnique("!@"));
	}
	
	public static boolean allCharUnique(String str){
		Hashtable<Integer, Character> charMap = new Hashtable<Integer, Character>(str.length());

		charMap.put(0, str.charAt(0));
		
		for(int i = 1; i < str.length(); i++){
			if (charMap.containsValue(str.charAt(i)  )  ) {
				return false;
			}
			charMap.put(i, str.charAt(i));//add(i, str.charAt(i));
		}
		return true;
	}
}