链式栈的实现（java）

堆栈的链式存储称为链栈。

public class Stack<T> implements StackInterface<T> {
	
	private Node<T> top;	//链表首结点引用
	private int size;	//栈的大小
	
	public Stack() {
		top = null;
		size = 0;
	}

	//返回堆栈的大小
	public int getSize() {
		return size;
	}

	//判断堆栈是否为空
	public boolean isEmpty() {
		return size==0;
	}

	//数据元素e入栈
	public void push(T t) {
		Node<T>  q = new Node<T>(t,top);
		top = q;
		size++;
	}

	//栈顶元素出栈
	public T pop() throws StackEmptyException {
	  if (size<1)
		throw new StackEmptyException("错误，堆栈为空。");
	  T t = top.getData();
	  top = top.getNext();
	  size--;
	  return t;
	}

	//取栈顶元素
	public T peek() throws StackEmptyException {
	  if (size<1)
		throw new StackEmptyException("错误，堆栈为空。");
	   return top.getData();
	}

     //测试：将10进制数转换成8进制数
     public static void main(String args[]){
         System.out.println("请输入十进制数");
         java.util.Scanner in=new java.util.Scanner(System.in);
         int i=in.nextInt();
         int temp=i;
         Stack<Integer> s=new Stack<Integer>();
         while(i>0){
            s.push(i%8);
            i=i/8;
          }

          System.out.println("十进制数"+temp+"转换成8进制数是：");
      
   
          while(!s.isEmpty())
            System.out.print(s.pop());
          
     }
}


interface StackInterface<T> {
	//返回堆栈的大小
	public int getSize();
	
	//判断堆栈是否为空
	public boolean isEmpty();
	
	//数据元素e入栈
	public void push(T t);
	
	//栈顶元素出栈
	public T pop() throws StackEmptyException;
	
	//取栈顶元素
	public T peek() throws StackEmptyException;
}

class Node< T> {
    private T data;
    private Node< T> next;

    public Node() {
	this(null,null);
    }

    public Node(T data, Node< T> next) {
        this.data = data;
        this.next = next;
    }
   public T getData(){
       return data;
    }
    public void setData(T data){
        this.data=data;
    }

    public Node<T> getNext(){
        return this.next;
    }

    public void setNext(Node<T> next){
       this.next=next;
   }
 }


//堆栈为空时出栈或取栈顶元素抛出此异常
class StackEmptyException extends RuntimeException{
	
	public StackEmptyException(String err) {
		super(err);
	}	
}

代码下载：