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²Î¼û³ÌÐòSubject.java
²Î¼û³ÌÐòRealSubject.java
²Î¼û³ÌÐòProxySubject.java
²Î¼û³ÌÐòClient.java
// ³éÏó½ÇÉ«
abstract public class Subject
{
abstract public void request();
}
//Õæʵ½ÇÉ«£ºÊµÏÖÁËSubjectµÄrequest()·½·¨
public class RealSubject extends Subject
{
public RealSubject()
{
}
public void request()
{
System.out.println("from real subject.");
}
}
//´úÀí½ÇÉ«
public class ProxySubject extends Subject
{
private RealSubject realSubject; // ÒÔÕæʵ½ÇÉ«×÷Ϊ´úÀí½ÇÉ«µÄÊôÐÔ
public ProxySubject()
{
}
public void request() // ¸Ã·½·¨·â×°ÁËÕæʵ¶ÔÏóµÄrequest·½·¨
{
preRequest();
if (realSubject == null)
{
realSubject = new RealSubject();
}
realSubject.request(); // ´Ë´¦Ö´ÐÐÕæʵ¶ÔÏóµÄrequest·½·¨
postRequest();
}
private void preRequest()
{
// something you want to do before requesting
}
private void postRequest()
{
// something you want to do after requesting
}
}
//¿Í»§¶Ëµ÷ÓÃ
public class Client
{
public static void main(String[] args)
{
//ÕâÀïÓõ½Á˶à̬»úÖÆ ÒòΪProxySubject¼Ì³ÐÁËSubject ËùÒÔ
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