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abstract public class Subject
{
abstract public void request();
}
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public class RealSubject extends Subject
{
public RealSubject()
{
}
public void request()
{
System.out.println("from real subject.");
}
}
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public class ProxySubject extends Subject
{
private RealSubject realSubject; //ÒÔÕæÊµ½ÇÉ«×÷Ϊ´úÀí½ÇÉ«µÄÊôÐÔ
public ProxySubject()
{
}
public void request() //¸Ã·½·¨·â×°ÁËÕæÊµ¶ÔÏóµÄrequest·½·¨
{
preRequest();
if( realSubject == null )
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