Function ganjil

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package javaapplication25;

import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Iterator;


public class JavaApplication25 {

    public static void main(String[] args) {
        // Arraylist
        ArrayList<String> al=new ArrayList<String>();
        al.add("Ravi");
        al.add("Vijay");
        al.add("Ravi");
        al.add("Ajay");
        Iterator itr=al.iterator();
        while(itr.hasNext()){
            System.out.println(itr.next());
        }

        // Hashtable
        Hashtable<String,String> urutan = new Hashtable<String,String>();
        urutan.put("A1", "Nasi Goreng");
        urutan.put("A2","Mie Ayam");
        urutan.put("A3","Es Teler");
        urutan.put("A4", "Es Teh");
        urutan.put("A5","Es Campur");
        urutan.put("A6","Lalapan");
        urutan.put("A7", "Tahu Campur");
        urutan.put("A8","Nasi Pecel");
        urutan.put("A9","Soto Ayam");
        urutan.put("A10","Soto Daging");
        String str;
        for(int i=1;i<11;i++) {
            str = "A" + i;
            if(isganjil(str)) {
                System.out.println(str + " : " + urutan.get(str));;
            }
        }
        System.out.println("Value of key 'A4': "+urutan.get("A4"));
        System.out.println("Is Hashtable empty? "+urutan.isEmpty());
        urutan.remove("A3");
        urutan.remove("A5");
        System.out.println(urutan);
        System.out.println("Size of the Hashtable:"+urutan.size());
    }
    public static boolean isganjil(String a) {
        String b = a;
        b = b.replaceAll("[^0-9]", "");
        return Integer.parseInt(b) % 2 != 0;
    }
}