Java版本和C++版本简朴Stack措施
副标题#e#
此刻对C++进修了一段时间,把C++的特性和Java做较量有很强烈的快感:P
本身写了两个版本的Stack:
Java版本:
源代码Stack.java
以下是引用片断: package org; public class Stack ...{ public static class Link ...{ protected Object data; protected Link next; public Link(Object data, Link next) ...{ this.data = data; this.next = next; } } private Link head = null; public void push(Object data) ...{ head = new Link(data, head); } public Object peek() ...{ return head.data; } public Object pop() ...{ if (head == null) return null; Object o = head.data; head = head.next; return o; } } 测试代码StackTest.java package org; import junit.framework.TestCase; public class StackTest extends TestCase ...{ public void test1() ...{ Stack s = new Stack(); 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()); } public void test2() ...{ Stack s = new Stack(); assertEquals(null, s.pop()); s.push(new Integer(1)); s.push(new Integer(2)); assertEquals(2, ((Integer)s.peek()).intValue()); assertEquals(2, ((Integer)s.pop()).intValue()); assertEquals(1, ((Integer)s.pop()).intValue()); assertEquals(null, s.pop()); } }
#p#副标题#e#
C++版本:
源代码:
Stack.cpp
以下是引用片断:
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
class Stack ...{
struct Link ...{
Link* next;
void* data;
Link(void* dat, Link* nxt) : data(dat) ,next(nxt) ...{}
}*head;
public :
Stack() : head(0) ...{}
void push(void* data) ...{
head = new Link(data, head);
}
void* pop() ...{
if (head == 0)
return 0;
void* object = head->data;
Link* oldHead = head;
head = oldHead->next;
delete oldHead;
return object;
}
void* peek() ...{
return head ? head->data : 0;
}
};
int main() ...{
ifstream in("Stack.cpp");
Stack text;
string line;
while(getline(in, line))
text.push(new string(line));
string* s;
while((s = (string*)text.pop()) != 0) ...{
cout << *s << endl;
delete s;
}
}