Question

我正在用Java开发飞机预订系统，当我运行代码时，它会导致错误。

我收到的错误是：

"Incompatible types: Date cannot be converted into calendar."

它出现在dateChooserCombo1.setSelectedDate(Calendar.getInstance().getTime());和dt=dateChooserCombo1.getSelectedDate();上我该怎么做才能消除此错误

 try
    {
        Class .forName("com.mysql.jdbc.Driver");
        con = DriverManager.getConnection("jdbc:mysql://localhost:3306/a_r_s","root","");
        dateChooserCombo1.setSelectedDate(Calendar.getInstance().getTime());
        sdf= new SimpleDateFormat("dd-MM-yyyy");
    }
    catch(Exception e)
    {
     System.out.println(e.getMessage());
    }
}

private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
    final Object[] columnNames=new String[] {"Date","Flight Name","Departure Time","BC Seats Available","XC Seats Available","EC Seats Available"};
    DefaultTableModel dtm=new DefaultTableModel(columnNames,0);        
    origin=jComboBox3.getSelectedItem().toString();
    target=jComboBox4.getSelectedItem().toString();
    fclass=jComboBox1.getSelectedItem().toString();

    dt=dateChooserCombo1.getSelectedDate();      
    SimpleDateFormat sdf1= new SimpleDateFormat("yyyy-MM-dd");
    strdtver2=(String) sdf1.format(dateChooserCombo1.getSelectedDate());
    /**************************************
    //Seven days flight calendar processing
    **************************************/
    dt7=dateChooserCombo1.getSelectedDate();
    Calendar cal = Calendar.getInstance();
    cal.setTime(dt7);
    cal.add(Calendar.DATE, 7);
    dt7 = cal.getTime();
    strdtver3=(String) sdf1.format(dt7);

Answer 1

日期和日历不是兼容类型。您必须在它们之间进行转换：

Date date= new Date();
Calendar cal = Calendar.getInstance(); 
cal.setTime(date);

还要确保使用正确的Java日期类型：java.util.Date而不是java.sql.Date。

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