Java设计模式

王朝java/jsp·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

1:单实例类

public class ConnectionPool {

//only one instance is needed

private static ConnectionPool instance;

private ConnectionPool() {

System.out.println("Createing the single instance of connection pool");

}

public static ConnectionPool getInstance() {

if(instance != null) {

System.out.println("Getting existing instance of connection pool ");

return instance;

} else {

instance = new ConnectionPool();

return instance;

}

}

public static void main(String args[]) {

System.out.println("Get connection pool first time");

ConnectionPool cPool = ConnectionPool.getInstance();

System.out.println("Get Connection pool second time ");

ConnectionPool annotherPool = ConnectionPool.getInstance();

}

}

适合于数据库连接池的使用,但是单实例很难扩展,,应该呗设计为并行执行。因为多线程将访问同一个单实例对象。

 
 
 
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