public void start(int delay,int internal )
{
timer.schedule(task,delay*1000,internal*1000);
}
改为:
public void start(int delay,int internal )
{
try {
timer.schedule(task,delay*1000,internal*1000);
}
catch(SQLException e) {
System.out.println("sqlerror");
}
}
{
timer.schedule(task,delay*1000,internal*1000);
}
改为:
public void start(int delay,int internal )
{
try {
timer.schedule(task,delay*1000,internal*1000);
}
catch(SQLException e) {
System.out.println("sqlerror");
}
}
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declared to be thrown
是典型的没有做异常处理的保错
{
public void run ()
{ ConnectionManager task = new ConnectionManager();
try {
task.Results();
} catch (SQLException e) {
......
}
}
};
redex(cc) 的思路是对的。不过加上以后还是报错。
按照 nwsl(阿甘) 的加上以后就成功了。非常感谢 redex(cc) 、nwsl(阿甘) 、wangqm0629(风景)、charlie0895(命—love alice crazy) !!
真的好感动,^_^。不过看了大家的回帖 ,有两点不是很明白的地方:
1、为什么没有做异常处理就报错呢?
2、我在定义 class PickTask 的时候,没有throws SQLException,ClassNotFoundException 的啊,
为什么可以做异常处理呢?(程序中的这里: catch (SQLException e) )。现在修改后可以正常执行的代码如下:import java.util.*;
import java.io.*;
import java.sql.*;public class TimerUse
{
public static void main(String[] args)
throws SQLException,ClassNotFoundException{
PickTask pt = new PickTask();
pt.start(1,3);
}
}// class PickTask start
class PickTask
{
private Timer timer;
PickTask()
{
timer = new Timer();
}
public TimerTask task = new TimerTask()
{
public void run ()
{
ConnectionManager task = new ConnectionManager();
try{
task.Results();
}
catch (SQLException e) {
System.out.println("sqlerroraa");
}
}
};
public void start(int delay,int internal )
{
try {
timer.schedule(task,delay*1000,internal*1000);
}
catch(SQLException e) {
System.out.println("sqlerrorbb");
}
}
}
// class PickTask endclass ConnectionManager
{
private Connection connection;
private Statement statement;
private String driver="sun.jdbc.odbc.JdbcOdbcDriver";
private String dbURL="jdbc:odbc:db";
private String login="test";
private String password="pwd";
private PreparedStatement stm;
ConnectionManager()
{
}
public void Results()
throws SQLException,ClassNotFoundException{
String sSQL="SELECT USER_NAME,USER_BH FROM T_USER_INFO WHERE USER_BH LIKE '00%'";
try{
Class.forName(driver);
connection=DriverManager.getConnection(dbURL,login,password);
Statement stm = connection.createStatement(); ResultSet res = stm.executeQuery(sSQL);
System.out.print("\n"+"Name"+"\t"+"User_BH");
while(res.next()){
System.out.print("\n"+res.getString("USER_NAME") +"\t"+ res.getString("USER_BH"));
}
stm.close();
}catch(SQLException e){
System.out.println("sqlerror");
connection=null;
}
}
}
TimerUse.java:34: unreported exception java.lang.ClassNotFoundException; must be
caught or declared to be thrown
task.Results();
^
TimerUse.java:48: exception java.sql.SQLException is never thrown in body of cor
responding try statement
catch (SQLException e) {
^
2 errors