Rencently, I'm checking the sources of JAVA SDK, the LinkedList got me. Here is it. ```package TCollection; import java.util.ArrayList; import java.util.Comparator; import java.util.LinkedList; import java.util.function.Consumer; /** * PrjName:JavaTest * Descrip: *

* Modification History: * Date Author Version * ========================================== * 17-3-6 下午8:36 * info: * _________________________________________ */ public class TList { public static void main(String[] args){ // TArrayList(); TLinkedList(); } static void TArrayList() { ArrayList arrayList = new ArrayList<>(10); for (int i = 0; i < 9;i++) { arrayList.add("a" + (9 - i)); } //print for (int i = 0; i < arrayList.size(); i++) { System.out.print(String.format("%s ", arrayList.get(i))); } System.out.println(""); //排序比较器 Comparator cmp = new Comparator() { @Override public int compare(String o1, String o2) { return o1.compareTo(o2); } }; arrayList.sort(cmp); //print for (int i = 0; i < arrayList.size(); i++) { System.out.print(String.format("%s ", arrayList.get(i))); } System.out.println(""); //操作器 Consumer consumer1 = new Consumer() { @Override public void accept(String s) { System.out.println(s+1); } }; Consumer consumer2 = new Consumer() { @Override public void accept(String s) { System.out.println("--"+s); } }; //操作器链接 arrayList.forEach(consumer1.andThen(consumer2).andThen(consumer1)); //print for (int i = 0; i < arrayList.size(); i++) { System.out.print(String.format("%s ", arrayList.get(i))); } System.out.println(""); //================================linkedList LinkedList linkedList = new LinkedList(); for (int i = 0; i < 10; i++) { linkedList.add("b"+i); } } static void TLinkedList() { //双向链表　　也实现了Stack Queue的接口 LinkedList list = new LinkedList<>(); list.add("1"); list.add("2"); list.add("3"); for (String s : list) { System.out.println(s); } list.remove(); list.forEach(p->System.out.println(p)); System.out.println("---------"); //Queue list.addFirst("4"); list.addFirst("5"); list.forEach(p->System.out.println(p)); System.out.println("---------"); System.out.println(list.removeLast()); System.out.println(list.removeLast()); System.out.println("---------"); //Stack list.clear(); list.push("1"); list.push("2"); list.push("3"); while (!list.isEmpty()) { System.out.println(list.pop()); } } }```