Java版本和C++版本的简单Stack程序

现在对C++学习了一段时间，把C++的特性和Java做比较有很强烈的快感:P
自己写了两个版本的Stack:

Java版本:
源代码Stack.java

packageorg;
publicclassStack...{
publicstaticclassLink...{

protectedObjectdata;

protectedLinknext;

publicLink(Objectdata,Linknext)...{
this.data=data;
this.next=next;
}
}

privateLinkhead=null;

publicvoidpush(Objectdata)...{
head=newLink(data,head);
}

publicObjectpeek()...{
returnhead.data;
}

publicObjectpop()...{
if(head==null)
returnnull;
Objecto=head.data;
head=head.next;
returno;
}

}

测试代码StackTest.java

packageorg;
importjunit.framework.TestCase;

publicclassStackTestextendsTestCase...{

publicvoidtest1()...{
Stacks=newStack();

assertEquals(null,s.pop());

s.push("a");
s.push("b");

assertEquals("b",s.peek());
assertEquals("b",s.pop());
assertEquals("a",s.pop());

assertEquals(null,s.pop());
}

publicvoidtest2()...{
Stacks=newStack();

assertEquals(null,s.pop());

s.push(newInteger(1));
s.push(newInteger(2));

assertEquals(2,((Integer)s.peek()).intValue());
assertEquals(2,((Integer)s.pop()).intValue());
assertEquals(1,((Integer)s.pop()).intValue());

assertEquals(null,s.pop());
}

}

C++版本:
源代码:
Stack.cpp

#include<fstream>
#include<iostream>
#include<string>
usingnamespacestd;

classStack...{
structLink...{
Link*next;
void*data;
Link(void*dat,Link*nxt):data(dat),next(nxt)...{}
}*head;

public:
Stack():head(0)...{}

voidpush(void*data)...{
head=newLink(data,head);
}

void*pop()...{
if(head==0)
return0;
void*object=head->data;
Link*oldHead=head;
head=oldHead->next;
deleteoldHead;
returnobject;
}

void*peek()...{
returnhead?head->data:0;
}
};

intmain()...{
ifstreamin("Stack.cpp");
Stacktext;
stringline;
while(getline(in,line))
text.push(newstring(line));
string*s;
while((s=(string*)text.pop())!=0)...{
cout<<*s<<endl;
deletes;
}
}