标签:style blog color io 使用 java ar div sp
首先引用JDK API中关于LinkedList的一句说明:"These operations allow linked lists to be used as a stack, queue, or double-ended queue."由此,可以得知,使用LinkedList可以轻松的实现栈和队列的功能。通过查看LinkedList源码实现,发现其底层采用双向链表实现。
一:使用LinkedList实现Stack
public class TestStack { public static void main(String[] args) { MyStack ms = new MyStack(); ms.push("aaa"); ms.push("bbb"); ms.push(new Integer(3)); System.out.println(ms.peek()); System.out.println(ms.pop()); System.out.println(ms.isEmpty()); System.out.println(ms.pop()); System.out.println(ms.pop()); System.out.println(ms.isEmpty()); } } |
|
public class TestStack
{
public static void main(String[] args)
{
MyStack ms = new MyStack();
ms.push("aaa");
ms.push("bbb");
ms.push(new Integer(3));
System.out.println(ms.peek());
System.out.println(ms.pop());
System.out.println(ms.isEmpty());
System.out.println(ms.pop());
System.out.println(ms.pop());
System.out.println(ms.isEmpty());
}
}
import java.util.LinkedList; public class TestStack { public static void main(String[] args) { MyStack ms = new MyStack(); ms.push("aaa"); ms.push("bbb"); ms.push(new Integer(3)); System.out.println(ms.peek()); System.out.println(ms.pop()); System.out.println(ms.isEmpty()); System.out.println(ms.pop()); System.out.println(ms.pop()); System.out.println(ms.isEmpty()); } } class MyStack { //无论栈还是队列,里面都会维护一个成员变量,该成员变量用于存储栈或队列的元素,该成员变量使用LinkedList类型。 private LinkedList list = new LinkedList(); public void push(Object o) { list.add(o); } public Object pop() { return list.removeLast(); } public Object peek()//查看栈顶元素 { return list.getLast(); } public boolean isEmpty() { return list.isEmpty(); } }
在Eclipse中的输出结果是:
--------------------------------------------------------------------------------
3
3
false
bbb
aaa
true
--------------------------------------------------------------------------------
二:使用LinkedList实现Queue
import java.util.LinkedList; public class TestQueue { public static void main(String[] args) { MyQueue mq = new MyQueue(); mq.put("aaa"); mq.put("bbb"); mq.put(new Integer(3)); System.out.println(mq.get()); System.out.println(mq.isEmpty()); System.out.println(mq.get()); System.out.println(mq.get()); System.out.println(mq.isEmpty()); } } class MyQueue { //无论栈还是队列,里面都会维护一个成员变量,该成员变量用于存储栈或队列的元素,该成员变量使用LinkedList类型。 private LinkedList list = new LinkedList(); public void put(Object o) { list.add(o);//this method is equivalent list.addFirst(o); } public Object get() { return list.remove();//or return list.removeFirst(); } public boolean isEmpty() { return list.isEmpty(); } }
在Eclipse中的输出结果是:
-------------------------------------------------------------------------------
aaa
false
bbb
3
true
-------------------------------------------------------------------------------
使用LinkedList实现Stack(栈)与Queue(队列)
标签:style blog color io 使用 java ar div sp
原文地址:http://www.cnblogs.com/xpjiang/p/3970002.html