StringLib.java

import java.util.Hashtable;


public class StringLib {

    public static Character firstNonRepeated(String str){

        int[] strA=new int[128];
        for (int i=0; i<strA.length;i++){
            strA[i]=0;
        }

        for (char c: str.toCharArray()){
            strA[c]++;
        }

        for (char c: str.toCharArray()){
            if (strA[c]==1)
                return new Character(c);
        }

        return null;

    }

    public static Character firstNonRepeated2(String str){

        Hashtable<Character,Integer> hash=new Hashtable<Character,Integer>();
        Character ch;
        Integer intgr;

        for (char c: str.toCharArray()){
            ch=new Character(c);
            intgr=(Integer)hash.get(ch);
            if (intgr==null)
                hash.put(ch, new Integer(1));
            else
                hash.put(ch, new Integer(intgr.intValue()+1));
        }

        for (char c: str.toCharArray()){
            ch=new Character(c);
            intgr=(Integer)hash.get(ch);
            if (intgr==1)
                return ch;
        }

        return null;

    }

    public static void main(String[] args){
        String str="long string with all sorts of punctuation! hello there ; ?";

        System.out.println("Fcn1: The first nonrepeated character of "+ str+" is: "+ StringLib.firstNonRepeated(str));
        System.out.println("Fcn2: The first nonrepeated character of "+ str+" is: "+ StringLib.firstNonRepeated2(str));

    }
}