001 package collections; 002 003 import java.util.List; 004 import java.util.LinkedList; 005 import java.util.Iterator; 006 import java.util.ListIterator; 007 008 public class UseLinkedList { 009 public void forEachLoop(List<Gerbil> list) { 010 for (Gerbil g : list) 011 g.jump(); 012 } 013 014 public void get(List<Gerbil> list) { 015 for (int i = 0; i < list.size(); i++) { 016 Gerbil g = list.get(i); 017 g.jump(); 018 } 019 } 020 021 public void useIterator(List<Gerbil> list) { 022 Iterator<Gerbil> it = list.iterator(); 023 while (it.hasNext()) { 024 Gerbil g = it.next(); 025 g.jump(); 026 } 027 } 028 029 public void useListIterator(List<Gerbil> list) { 030 ListIterator<Gerbil> it = list.listIterator(); 031 while (it.hasNext()) { 032 Gerbil g = it.next(); 033 g.jump(); 034 } 035 } 036 037 /** 038 * Main method that uses ArrayList and Gerbil objects 039 */ 040 public static void main(String[] args) { 041 LinkedList<Gerbil> gerbils = new LinkedList<Gerbil>(); 042 for (int i = 0; i < 42; i++) { 043 gerbils.add(new Gerbil(i)); 044 } 045 046 UseLinkedList cls = new UseLinkedList(); 047 cls.forEachLoop(gerbils); 048 cls.get(gerbils); 049 cls.useIterator(gerbils); 050 cls.useListIterator(gerbils); 051 } 052 }