public interface CountDao
{
// 查看賬戶方法
public void queryCount();
}
public class CountDaoImpl implements CountDao
{
public void queryCount()
{
System.out.println("查看賬戶方法...");
}
}
public class CountTrancProxy implements CountDao
{
private CountDao countDao;
public CountProxy(CountDao countDao)
{
this.countDao = countDao;
}
@Override
public void queryCount()
{
System.out.println("tranc start");
countDao.queryCount();
System.out.println("tranc end");
}
}
public class TestCount
{
public static void main(String[] args)
{
CountTrancProxy countProxy = new CountTrancProxy(new CountDaoImpl());
countProxy.updateCount();
}
}

public class CountLogProxy implements CountDao
{
private CountDao countDao;
public CountLogProxy(CountDao countDao)
{
this.countDao = countDao;
}
@Override
public void queryCount()
{
System.out.println("Log start");
countDao.queryCount();
System.out.println("Log end");
}
}

// 體現了聚合的思想，代理之間的組合
public static void main(String[] args)
{
CountTrancProxy trancProxy = new CountTrancProxy(new CountDaoImpl());
CountLogProxy logPro = new CountLogProxy(trancProxy);
logPro.queryCount();
}