testjdbc.java

来自「java的源代码」· Java 代码 · 共 47 行

public class TestJDBC{
	public static void main(String[] args){
		//OracleDriver d=new OracleDriver();
		Driver d=new DB2Driver();
		ConnectDB c=new ConnectDB();
		c.setDriver(d);
		c.service();
	}
}
class ConnectDB{
	/*
	//OracleDriver driver;
	DB2Driver driver;
	//public void setDriver(OracleDriver driver){
	public void setDriver(DB2Driver driver){
		this.driver=driver;
	}
	public void service(){
		//driver.connectOracle();
		driver.db2Connect();
	}
	*/
	Driver driver;
	public void setDriver(Driver driver){
		this.driver=driver;
	}
	public void service(){
		driver.connect();
	}
}
// Sun  Oracle IBM Microsoft
interface Driver{
	void connect();
}

// Oracle
class OracleDriver implements Driver{
	public void connect(){
		System.out.println("Connect Oracle");
	}
}
//IBM
class DB2Driver implements Driver{
	public void connect(){
		System.out.println("Connect DB2");
	}
}