expressstack.java

Java编写的仿windows计算器

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class ExpressStack 
{
	private double data;
	
	/*****************************空构造函数***********************************/
	private ExpressStack nextNode;
	
	public ExpressStack ( double data )
	{
		this( data, null );
	}
	
	/****************************带参数构造函数********************************/
	public ExpressStack ( double getData, ExpressStack next )
	{
		data = getData;
		nextNode = next;
	}
	
	/*****************************入栈*****************************************/
	public synchronized void push( double newDate )
	{
		  nextNode = new ExpressStack( newDate, nextNode );
    }//end method  push
	
	/*****************************出栈*****************************************/
	public synchronized double pop( )
	{
		double number = nextNode.data;
		nextNode = nextNode.nextNode;
		return number;
	}//end method  pop
	
	/*****************************获取栈顶元素栈*******************************/
	public synchronized double getTop()
	{
		return nextNode.data; 
	}//end method  getTop
	
	/****************************判断是否空栈**********************************/
	public synchronized boolean isEmpty()
	{
		return nextNode == null;
	}//end method  isEmpty
}//end class ExpressStack