我發了一個包名mybundle。在這裏面,我有一個名爲的DBA連接管理器.java的java文件。我試圖編譯這個文件,但它給出了一個錯誤信息。在編譯Java連接池類時收到錯誤消息
DBConnectionManager.java
package mybundle;
import java.sql.*;
import java.util.*;
public class DBConnectionManager{
private String qry, driver, db, msg;
private Vector connectionPool;
public DBConnectionManager(){
this.connectionPool = new Vector();
driver = "sun.jdbc.odbc.JdbcOdbcDriver";
db = "jdbc:odbc:db";
initialize();
}
private void initialize(){
initializeConnectionPool();
}
private String initializeConnectionPool(){
while(!checkIfConnectionPoolIsFull()){
connectionPool.addElement(createNewConnectionForPool());
}
msg = "Connection Pool is full..";
return msg;
}
private boolean checkIfConnectionPoolIsFull(){
final int MAX_POOL_SIZE = 5;
if(connectionPool.size() < 5){
return false;
}
return true;
}
private Connection createNewConnectionForPool(){
Connection connection = null;
try{
Class.forName(driver);
connection = DriverManager.getConnection(db);
}catch(Exception ex){}
return connection;
}
public Connection getConnectionFromPool(){
Connection connection = null;
if(connectionPool.size() > 0){
connection = (Connection)connectionPool.firstElement();
connectionPool.removeElementAt(0);
}
return connection;
}
public void returnConnectionToPool(Connection connection){
connectionPool.addElement(connection);
}}
這是我已經把Tomcat的,JDK1.5和我的包mybndle
我的jdk1.5和Tomcat是:
D:\ java \ jdk1.0
D:\ java \ tomcat
d:\ java的\ mybundle
這就是我如何編譯DBConnectionManager.java文件
d:\ java的\ mybundle>設定路徑= d:\ java的\ JDK1.5 \倉
d:\ java的\ mybundle> javac的DBConnectionManager.java
我收到此錯誤信息
D:\>cd java
D:\Java>cd mybundle
D:\Java\mybundle>set path=d:\java\jdk1.5\bin
D:\Java\mybundle>javac DBConnectionManager.java
Note: DBConnectionManager.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
D:\Java\mybundle>
我在努力弄清楚什麼是錯的,但徒勞的。請幫助我。謝謝
這是警告沒有錯誤。但更好使用'ArrayList'而不是'Vector' – vels4j
謝謝** @ vels4j **。讓我試試ArrayList。 –
你用-Xlint重新編譯:未檢查細節? – Suranga