小编Has*_*nga的帖子

我写了这段代码，在软件启动时从数据库（MYSQL控制中心）获取数据并将它们带到表中。但是，当我编译此代码2时会发生错误。

Note: C:\Users\Commander Shepard\Documents\NetBeansProjects\Furniture Management System\src\furnituremanagementsystem\employee.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.

我的代码：

public class employee extends javax.swing.JFrame {

    // Creates new form employee
    public employee() {
        initComponents();           

        Date now = new Date();
        SimpleDateFormat formatter = new SimpleDateFormat("yyyy/MM/dd");
        datelabel.setText(formatter.format(now));

        try {
            Statement s = DB.getConnection().createStatement();
            DefaultTableModel dtm = (DefaultTableModel) jTable1.getModel();
            dtm.setRowCount(0);
            ResultSet r = s.executeQuery("SELECT * from Employee");
            while (r.next()) {
                Vector v = new Vector();
                v.add(r.getString(1));
                v.add(r.getString(2));
                v.add(r.getString(3));
                v.add(r.getString(4));
                v.add(r.getString(5));
                v.add(r.getString(6));
                v.add(r.getString(7));
                v.add(r.getString(8));
                v.add(r.getString(9)); …

如果两次提出同样的问题被认为是垃圾邮件,我真的很抱歉,因为我已经在一小时前询问过反向计时器了.

但现在新的问题是,我再也无法引起任何人对这个问题的关注.我已经成功编码了计时器,感谢你们,但后来我试着将秒转换为hh:mm:ss格式,但它没有用.而不是继续前进到00:00:00.它只显示我编码的时间,就是这样.

这是我的代码.

import java.util.Timer;
import java.util.TimerTask;
public class countdown extends javax.swing.JFrame {


public countdown() {
    initComponents();
    Timer timer;

    timer = new Timer();
    timer.schedule(new DisplayCountdown(), 0, 1000);
}

class DisplayCountdown extends TimerTask {

      int seconds = 5;
      int hr = (int)(seconds/3600);
      int rem = (int)(seconds%3600);
      int mn = rem/60;
      int sec = rem%60;
      String hrStr = (hr<10 ? "0" : "")+hr;
      String mnStr = (mn<10 ? "0" : "")+mn;
      String secStr = (sec<10 ? "0" : "")+sec; 

      public void run() …