LinkedList类是双向列表,列表中的每个节点都包含了对前一个和后一个元素的引用.
LinkedList的构造函数如下
1. public LinkedList(): ——生成空的链表
2. public LinkedList(Collection col): 复制构造函数
1、获取链表的第一个和最后一个元素
-
import java.util.LinkedList;
-
-
public class LinkedListTest{
-
public static void main(String[] args) {
-
LinkedList<String> lList = new LinkedList<String>();
-
lList.add("1");
-
lList.add("2");
-
lList.add("3");
-
lList.add("4");
-
lList.add("5");
-
-
-
System.out.println("链表的第一个元素是 : " + lList.getFirst());
-
System.out.println("链表最后一个元素是 : " + lList.getLast());
-
}
-
}
2、获取链表元素
-
for (String str: lList) {
-
System.out.println(str);
-
}
3、从链表生成子表
-
List subl = lList.subList(1, 4);
-
System.out.println(subl);
-
lst.remove(2);
-
System.out.println(lst);
-
System.out.println(lList);
4、添加元素:添加单个元素
如果不指定索引的话,元素将被添加到链表的最后.
public boolean add(Object element)
public boolean add(int index, Object element)
也可以把链表当初栈或者队列来处理:
public boolean addFirst(Object element)
public boolean addLast(Object element)
addLast()方法和不带索引的add()方法实现的效果一样.
-
import java.util.LinkedList;
-
-
public class LinkedListTest{
-
public static void main(String[] a) {
-
LinkedList list = new LinkedList();
-
list.add("A");
-
list.add("B");
-
list.add("C");
-
list.add("D");
-
list.addFirst("X");
-
list.addLast("Z");
-
System.out.println(list);
-
}
-
}
5、删除元素
-
public Object removeFirst()
-
public Object removeLast()
-
import java.util.LinkedList;
-
-
-
public class MainClass {
-
public static void main(String[] a) {
-
-
-
LinkedList list = new LinkedList();
-
list.add("A");
-
list.add("B");
-
list.add("C");
-
list.add("D");
-
list.removeFirst();
-
list.removeLast();
-
System.out.println(list);
-
}
-
}
6、使用链表实现栈效果
-
import java.util.LinkedList;
-
public class MainClass {
-
public static void main(String[] args) {
-
StackL stack = new StackL();
-
for (int i = 0; i < 10; i++)
-
stack.push(i);
-
System.out.println(stack.top());
-
System.out.println(stack.top());
-
System.out.println(stack.pop());
-
System.out.println(stack.pop());
-
System.out.println(stack.pop());
-
}
-
}
-
class StackL {
-
private LinkedList list = new LinkedList();
-
public void push(Object v) {
-
list.addFirst(v);
-
}
-
public Object top() {
-
return list.getFirst();
-
}
-
public Object pop() {
-
return list.removeFirst();
-
}
-
}
7、使用链表来实现队列效果
-
import java.util.LinkedList;
-
public class MainClass {
-
public static void main(String[] args) {
-
Queue queue = new Queue();
-
for (int i = 0; i < 10; i++)
-
queue.put(Integer.toString(i));
-
while (!queue.isEmpty())
-
System.out.println(queue.get());
-
}
-
}
-
class Queue {
-
private LinkedList list = new LinkedList();
-
public void put(Object v) {
-
list.addFirst(v);
-
}
-
public Object get() {
-
return list.removeLast();
-
}
-
public boolean isEmpty() {
-
return list.isEmpty();
-
}
-
}
8、将LinkedList转换成ArrayList
-
ArrayList<String> arrayList = new ArrayList<String>(linkedList);
-
for (String s : arrayList) {
-
System.out.println("s = " + s);
-
}
9、删掉所有元素:清空LinkedList
lList.clear();
10、删除列表的首位元素
-
import java.util.LinkedList;
-
public class Main {
-
public static void main(String[] args) {
-
LinkedList<String> lList = new LinkedList<String>();
-
lList.add("1");
-
lList.add("2");
-
lList.add("3");
-
lList.add("4");
-
lList.add("5");
-
System.out.println(lList);
-
-
Object object = lList.removeFirst();
-
System.out.println(object + " has been removed");
-
System.out.println(lList);
-
object = lList.removeLast();
-
System.out.println(object + " has been removed");
-
System.out.println(lList);
-
}
-
}
11、根据范围删除列表元素
-
import java.util.LinkedList;
-
public class Main {
-
public static void main(String[] args) {
-
LinkedList<String> lList = new LinkedList<String>();
-
lList.add("1");
-
lList.add("2");
-
lList.add("3");
-
lList.add("4");
-
lList.add("5");
-
System.out.println(lList);
-
lList.subList(2, 5).clear();
-
System.out.println(lList);
-
}
-
}
12、删除链表的特定元素
-
import java.util.LinkedList;
-
public class Main {
-
public static void main(String[] args) {
-
LinkedList<String> lList = new LinkedList<String>();
-
lList.add("1");
-
lList.add("2");
-
lList.add("3");
-
lList.add("4");
-
lList.add("5");
-
System.out.println(lList);
-
System.out.println(lList.remove("2"));
-
System.out.println(lList);
-
Object obj = lList.remove(2);
-
System.out.println(obj + " 已经从链表删除");
-
System.out.println(lList);
-
}
-
}
13、将LinkedList转换为数组,数组长度为0
-
import java.util.LinkedList;
-
import java.util.List;
-
public class Main {
-
public static void main(String[] args) {
-
List<String> theList = new LinkedList<String>();
-
theList.add("A");
-
theList.add("B");
-
theList.add("C");
-
theList.add("D");
-
String[] my = theList.toArray(new String[0]);
-
for (int i = 0; i < my.length; i++) {
-
System.out.println(my[i]);
-
}
-
}
-
}
14、将LinkedList转换为数组,数组长度为链表长度
-
import java.util.LinkedList;
-
import java.util.List;
-
public class Main {
-
public static void main(String[] args) {
-
List<String> theList = new LinkedList<String>();
-
theList.add("A");
-
theList.add("B");
-
theList.add("C");
-
theList.add("D");
-
String[] my = theList.toArray(new String[theList.size()]);
-
for (int i = 0; i < my.length; i++) {
-
System.out.println(my[i]);
-
}
-
}
-
}
15、将LinkedList转换成ArrayList
-
import java.util.ArrayList;
-
import java.util.LinkedList;
-
import java.util.List;
-
public class Main {
-
public static void main(String[] args) {
-
LinkedList<String> myQueue = new LinkedList<String>();
-
myQueue.add("A");
-
myQueue.add("B");
-
myQueue.add("C");
-
myQueue.add("D");
-
List<String> myList = new ArrayList<String>(myQueue);
-
for (Object theFruit : myList)
-
System.out.println(theFruit);
-
}
-
}
16、实现栈
-
import java.util.Collections;
-
import java.util.LinkedList;
-
public class Main {
-
public static void main(String[] argv) throws Exception {
-
LinkedList stack = new LinkedList();
-
Object object = "";
-
stack.addFirst(object);
-
Object o = stack.getFirst();
-
stack = (LinkedList) Collections.synchronizedList(stack);
-
}
-
}
17、实现队列
-
import java.util.LinkedList;
-
public class Main {
-
public static void main(String[] argv) throws Exception {
-
LinkedList queue = new LinkedList();
-
Object object = "";
-
-
queue.add(object);
-
-
Object o = queue.removeFirst();
-
}
-
}
18 、同步方法
-
import java.util.Collections;
-
import java.util.LinkedList;
-
public class Main {
-
public static void main(String[] argv) throws Exception {
-
LinkedList queue = new LinkedList();
-
Object object = "";
-
queue.add(object);
-
Object o = queue.removeFirst();
-
queue = (LinkedList) Collections.synchronizedList(queue);
-
}
-
}
19、查找元素位置
-
import java.util.LinkedList;
-
-
public class Main {
-
public static void main(String[] args) {
-
LinkedList<String> lList = new LinkedList<String>();
-
lList.add("1");
-
lList.add("2");
-
lList.add("3");
-
lList.add("4");
-
lList.add("5");
-
lList.add("2");
-
System.out.println(lList.indexOf("2"));
-
System.out.println(lList.lastIndexOf("2"));
-
}
-
}
20、替换元素
-
import java.util.LinkedList;
-
-
public class Main {
-
public static void main(String[] args) {
-
LinkedList<String> lList = new LinkedList<String>();
-
lList.add("1");
-
lList.add("2");
-
lList.add("3");
-
lList.add("4");
-
lList.add("5");
-
System.out.println(lList);
-
lList.set(3, "Replaced");
-
System.out.println(lList);
-
}
-
}
21、链表添加对象
-
import java.util.LinkedList;
-
class Address {
-
private String name;
-
private String street;
-
private String city;
-
private String state;
-
private String code;
-
Address(String n, String s, String c, String st, String cd) {
-
name = n;
-
street = s;
-
city = c;
-
state = st;
-
code = cd;
-
}
-
public String toString() {
-
return name + " " + street + " " + city + " " + state + " " + code;
-
}
-
}
-
-
-
class MailList {
-
public static void main(String args[]) {
-
LinkedList<Address> ml = new LinkedList<Address>();
-
ml.add(new Address("A", "11 Ave", "U", "IL", "11111"));
-
ml.add(new Address("R", "11 Lane", "M", "IL", "22222"));
-
ml.add(new Address("T", "8 St", "C", "IL", "33333"));
-
for (Address element : ml)
-
System.out.println(element + "\n");
-
}
-
}
22、确认链表是否存在特定元素
-
import java.util.LinkedList;
-
-
-
public class Main {
-
public static void main(String[] args) {
-
LinkedList<String> lList = new LinkedList<String>();
-
lList.add("1");
-
lList.add("2");
-
lList.add("3");
-
lList.add("4");
-
lList.add("5");
-
if (lList.contains("4")) {
-
System.out.println("LinkedList contains 4");
-
} else {
-
System.out.println("LinkedList does not contain 4");
-
}
-
}
-
}
23、根据链表元素生成对象数组
-
Object[] objArray = lList.toArray();
-
for (Object obj: objArray) {
-
System.out.println(obj);
-
}
24、链表多线程
-
import java.util.Collections;
-
import java.util.LinkedList;
-
import java.util.List;
-
class PrepareProduction implements Runnable {
-
private final List<String> queue;
-
PrepareProduction(List<String> q) {
-
queue = q;
-
}
-
public void run() {
-
queue.add("1");
-
queue.add("done");
-
}
-
}
-
class DoProduction implements Runnable {
-
private final List<String> queue;
-
DoProduction(List<String> q) {
-
queue = q;
-
}
-
public void run() {
-
String value = queue.remove(0);
-
while (!value.equals("*")) {
-
System.out.println(value);
-
value = queue.remove(0);
-
}
-
}
-
}
-
public class Main {
-
public static void main(String[] args) throws Exception {
-
List q = Collections.synchronizedList(new LinkedList<String>());
-
Thread p1 = new Thread(new PrepareProduction(q));
-
Thread c1 = new Thread(new DoProduction(q));
-
p1.start();
-
c1.start();
-
p1.join();
-
c1.join();
-
}
-
}
25、优先级链表(来自JBOSS)
26、生成list的帮助类(来自google)
-
import java.util.ArrayList;
-
import java.util.Collections;
-
import java.util.LinkedList;
-
import java.util.List;
-
public class Lists {
-
private Lists() { }
-
public static <E> ArrayList<E> newArrayList() {
-
return new ArrayList<E>();
-
}
-
public static <E> ArrayList<E> newArrayListWithCapacity(int initialCapacity) {
-
return new ArrayList<E>(initialCapacity);
-
}
-
public static <E> ArrayList<E> newArrayList(E... elements) {
-
ArrayList<E> set = newArrayList();
-
Collections.addAll(set, elements);
-
return set;
-
}
-
public static <E> ArrayList<E> newArrayList(Iterable<? extends E> elements) {
-
ArrayList<E> list = newArrayList();
-
for(E e : elements) {
-
list.add(e);
-
}
-
return list;
-
}
-
public static <E> LinkedList<E> newLinkedList() {
-
return new LinkedList<E>();
-
}
-
}
-
java LinkedList的使用方法介绍
原文:http://blog.csdn.net/love_xsq/article/details/43698749