LinkedList基本用法

LinkedList類是雙向列表,列表中的每個節點都包含了對前一個和後一個元素的引用.
LinkedList的構造函數如下
1. public LinkedList():  ——生成空的鏈表
2. public LinkedList(Collection col):  復制構造函數

1、獲取鏈表的第一個和最後一個元素
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("鏈表的第一個元素是 : " + lList.getFirst());
    System.out.println("鏈表最後一個元素是 : " + lList.getLast());
  }
}

2、獲取鏈表元素

for (String str: lList) {
      System.out.println(str);
    }

3、從鏈表生成子表

List subl = lList.subList(1, 4);
    System.out.println(subl);
    lst.remove(2);
    System.out.println(lst);
    System.out.println(lList);

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：添加單個元素
 如果不指定索引的話，元素將被添加到鏈表的最後.
public boolean add(Object element)
public boolean add(int index, Object element)
也可以把鏈表當初棧或者隊列來處理:
public boolean addFirst(Object element)
public boolean addLast(Object element)
addLast()方法和不帶索引的add()方法實現的效果一樣.

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、刪除元素

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);
  }
}

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、使用鏈表實現棧效果

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、使用鏈表來實現隊列效果

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、將LinkedList轉換成ArrayList

ArrayList<String> arrayList = new ArrayList<String>(linkedList);
    for (String s : arrayList) {
      System.out.println("s = " + s);
    }

ArrayList<String> arrayList = new ArrayList<String>(linkedList);
    for (String s : arrayList) {
      System.out.println("s = " + s);
    }

9、刪掉所有元素：清空LinkedList
    lList.clear();
10、刪除列表的首位元素

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);
        //元素在刪除的時候，仍然可以獲取到元素
    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);
  }
}

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