PolymorphismEx3.java

package com.study.polymorphism;

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;

public class PolymorphismEx3 {

    static void addIntegersToList(List<Integer> list, int count) {
        for(int i=0; i < count; ++i) list.add(i);
    }

    static void removeOddNumbers(List<Integer> list) {
        Iterator<Integer> iterator = list.iterator();
        while(iterator.hasNext()) {
            int i = iterator.next();
            if(i % 2 == 1) iterator.remove();
        }
    }

    static void printList(List<Integer> list) {
        for(int i : list) System.out.printf("%d ", i);
        System.out.println();
    }

    static void doSomething(List<Integer> list) {
        addIntegersToList(list, 20);
        removeOddNumbers(list);
        printList(list);
    }

    public static void main(String[] args) {
        doSomething(new ArrayList<Integer>());
        doSomething(new LinkedList<Integer>());
    }

}