1.栈操作

package Source;   
  
import java.util.LinkedList;   
  
//用List定义一个栈   
public class Stack   
{   
    //构造方法   
    public Stack()   
    {   
        list = new LinkedList();   
        isEmpty = true;   
    }   
    //入栈   
    public void push(Object node)   
    {   
        list.add(node);   
        if(isEmpty) isEmpty = false;   
    }   
    //出栈   
    public Object pop()   
    {   
        if(!isEmpty)   
        {   
            Object node = list.getLast();   
            list.removeLast();   
            if(list.size() == 0) isEmpty = true;   
            return node;   
        }    
        else return null;   
    }   
    //获取栈顶元素   
    public Object getTop()   
    {   
        if(!isEmpty) return list.getLast();   
        else return null;   
    }   
    //获取栈的元素个数   
    public int getSize()   
    {   
        return list.size();   
    }   
       
    //获取指定元素   
    public Object getElement(int index)   
    {   
        int size = getSize();   
        if(index < 0 || index > size) return null;   
        else return list.get(index);   
    }   
    //删除元素   
    public void remove(int index)   
    {   
        list.remove(index);   
    }   
    //置栈空   
    public boolean empty()   
    {   
        return isEmpty;   
    }   
    //打印栈内元素   
    public void print()   
    {   
        int size = list.size();   
        for(int i = size - 1; i >= 0; i--)   
            System.out.print((new StringBuilder(String.valueOf(list.get(i).toString()))).append(" ").toString());   
  
    }   
  
    private LinkedList list;   
    private boolean isEmpty;   
}   

 2.符号集合

package Source;   
  
  
//定义一些需特殊处理的html标识   
public class Symbol   
{   
    public static String jump[] =    
    {   
        "span", "select", "script", "h", "ul", "li", "TEXTAREA", "style"  
    };   
    public static String ignore[] =    
    {   
        "/p", "br", "form", "/form", "param", "/img", "p", "img", "hr", "!",    
        "input"  
    };   
    public static String remove[] =    
    {   
        " ", ">"  
    };   
}