c++ STL标准容器之Iterator使用

package java.util;  
  
  
public interface Iterator<E> {  
  
    boolean hasNext();  
  
    E next();  
  
  
    void remove();  
}

map<int,int> amap;  
amap.insert(pair<int,int>(1,1));  
amap.insert(pair<int.int>(2,2));  
map<int,int>::iterator it;  
for(it = amap.begin();it != ampa.end();it++)//从前向后  
{  
    cout<<"key:"<<it->first<<" value:"<<it->second<<endl;

}

map<int,int>::reverse_iterator rit;  
for(rit = amap.rbegin();rit != amap.rend();rit++)//从后向前  
{  
     cout<<"key:"<<rit->first<<" value:"<<rit->second<<endl;  
}