基于链表实现Java 自定义Stack栈

接下来让我们看看，如何利用单链表结构来实现栈与队列。由于栈的操作只限于栈顶元素，而单链表只有对首元素才能在O(1)时间内完成插入和删除，故这里把单链表的首节点作为栈顶，其余元素依次排列。此外，为了保证getSize()方法也能够在O(1)时间内完成，还需借助一个实例变量来动态记录栈中元素的数目。具体的实现如 代码二.12 所示。

Node类 Java代码见（ Java 实现链表）

StackLink 类：

package com.list.stack;

import java.util.Arrays;

import com.stack.ExceptionStackEmpty;
import com.list.stack.Node;

public class StackList {

    //Declared size of stack list
    private static int size;
    //Declared element 
    private static Node top;
    public StackList() {
        this.size = 0;
        this.top = null;
    }

    // Get the size of stack
    public int getSize() {
        if(isEmpty())
            return 0;
        else
            return size;
    }

    // Get whether stack is empty
    public boolean isEmpty() {
        return size == 0;
    }

    // Get the top element of stack
    public Object top() throws ExceptionStackEmpty {
        if(isEmpty())
            throw new ExceptionStackEmpty("Stack is empty!");
        return top.getElement();
    }

    // Push element to stack
    public void push(Object element){
        Node newNode = new Node(element,top);
        top = newNode;
        size ++;
    }

    // Pop element from stack
    public Object pop() throws ExceptionStackEmpty {
        if(isEmpty())
            throw new ExceptionStackEmpty("Stack is empty!");
        Object container = top.getElement();
        top = top.getNext();
        size --;
        return container;
    }

    // Get the all elements of stack
    public void getAllElements() throws ExceptionStackEmpty {
        Node travelTop;
        travelTop = top;
        Object[] array = new Object[getSize()];

        for(int i = 0;i < array.length;i ++ ){
            array[i] = travelTop.getElement();
            travelTop = travelTop.getNext();
        }
        System.out.println("Get all elemnt: " + Arrays.toString(array));
    }
}

StackLinkTest 类：

package com.list.stack;

import com.stack.ExceptionStackEmpty;

public class StackListTest {

    public static void main(String[] args) throws ExceptionStackEmpty {

        //Test Class StackList
        StackList sl = new StackList();
        System.out.println("Size of stack list: " + sl.getSize());
        System.out.println("Is emplty? : " + sl.isEmpty());
        sl.push(12);
        sl.push(13);
        sl.push(15);
        sl.push(17);
        sl.push(2);
        sl.push(6);
        sl.getAllElements();
        System.out.println("Size of stack list: " + sl.getSize());
        System.out.println("Is emplty? : " + sl.isEmpty());
        //sl.getAllElements();
        System.out.println(sl.pop());
        System.out.println(sl.pop());
        System.out.println(sl.pop());
        System.out.println(sl.pop());
        System.out.println(sl.pop());
        System.out.println(sl.pop());
        System.out.println("Size of stack list: " + sl.getSize());
        System.out.println("Is emplty? : " + sl.isEmpty());

    }

}

测试结果:

Size of stack list: 0
Is emplty? : true
Get all elemnt: [6, 2, 17, 15, 13, 12]
Size of stack list: 6
Is emplty? : false
6
2
17
15
13
12
Size of stack list: 0
Is emplty? : true

转载请注明出处，谢谢！
http://blog.youkuaiyun.com/github_27609763/article/details/46476917