链表栈与链表队列

链表栈与链表队列

 

链表实现的栈和队列，这里只展示实现过程，有不明的地方可以参看我的前面关于栈，队列和列表的说明

 

 

//栈：先进后出
class LinkStack{
	public static void main(String[] args) {
		LinkStack l = new LinkStack();
		l.push(1);
		l.push(2);
		l.push(3);
		l.displayStack();
		l.pop();
		l.displayStack();
	}
	
	public Link first;
	
	public LinkStack(){
		first = null;
	}
	
	public void push(int i){
		Link newLink = new Link(i);
		newLink.next = first;
		first = newLink;
	}
	
	public void pop(){
		if(isEmpty()){
			System.out.println("Stack is empty");
		}
		first = first.next;
	}
	
	public void displayStack(){
		if(isEmpty()){
			System.out.println("Stack is empty");
		}else{
			Link current = first;
			while(current != null){
				current.displayLink();
				current = current.next;
			}
		}
	}
	
	public boolean isEmpty(){
		return first == null;
	}
}
//链接点对象
class Link{
	public int iData;
	
	//关系子段，用于存储下一个链接点的位置
	public Link next;
	public Link(int id){
		this.iData = id;
	}
	public void displayLink(){
		System.out.println("{" + iData + "}");
	}
}

 

//队列：先进先出
class LinkQueue {
	public static void main(String[] args) {
		LinkQueue lq = new LinkQueue();
		lq.insert(1);
		lq.insert(2);
		lq.disPlay();
		lq.remove();
		System.out.println("remove----");
		lq.disPlay();
	}
	
	public Link first;

	public Link last;

	public LinkQueue() {
		first = null;
		last = null;
	}

	public boolean isEmpty() {
		return first == null;
	}

	public void insert(int value) {
		Link newLink = new Link(value);
		if (isEmpty()) {
			first = newLink;
		} else {
			last.next = newLink;
		}
		last = newLink;
	}

	public void remove() {
		if (isEmpty()) {
			System.out.println("LinkQueue is empty");
		} else {
			if (first.next == null) {
				last = null;
			}
			first = first.next;
		}
	}
	
	public void disPlay(){
		Link current = first;
		while(current!=null){
			current.displayLink();
			current = current.next;
		}
	}
}

// 链接点对象
class Link {
	public int iData;

	// 关系子段，用于存储下一个链接点的位置
	public Link next;

	public Link(int id) {
		this.iData = id;
	}

	public void displayLink() {
		System.out.println("{" + iData + "}");
	}
}