我已经构建了以下 JDateChooser:
availFromDate = new JDateChooser();
availFromDate.setDateFormatString("dd/MM/yyyy");
JTextFieldDateEditor dateEditor = (JTextFieldDateEditor)availFromDate.getComponent(1);
dateEditor.setHorizontalAlignment(JTextField.RIGHT);
availFromDate.setSize(new Dimension(50, 0));
availFromDate.add(availablefromT);
calendarP.add(availFromDate);
contentPane.add(calendarP);
frame1.add(contentPane);
frame1.setVisible(true);
但是,我需要从 JDateChooser 中选择的日期出现在它所在的 JTextField 中。我意识到必须涉及一个 getDate() 方法,但我不确定如何实现它。
如何获取日期并在文本字段中以 dd/MM/yyyy 格式显示?
编辑:
看到建议后,我尝试了以下方法:
SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
String date = sdf.format(availFromDate.getDate());
availablefromT.setText(date);
不过,现在我得到了 NullPointerException。有谁知道为什么?似乎与此有关:String date = sdf.format(availFromDate.getDate());
错误:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.util.Calendar.setTime(Calendar.java:1770)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:943)
at java.text.SimpleDateFormat.format(SimpleDateFormat.java:936)
at java.text.DateFormat.format(DateFormat.java:345)
at Controller.makeCustEnquiryGUI(Controller.java:2061)
例子:
import com.toedter.calendar.JDateChooser;
import com.toedter.calendar.JTextFieldDateEditor;
import java.awt.*;
import java.awt.event.*;
import java.text.SimpleDateFormat;
import javax.swing.*;
import java.util.*;
public class CalendarTest {
private JFrame chooseCruiseFrame;
private JDateChooser availFromDate;
private JTextField availablefromT;
private JPanel contentPane;
private JPanel centerP;
public static void main(String[] args) {
new CalendarTest();
}
public CalendarTest() {
//////////// Creating Frame
chooseCruiseFrame = new JFrame("");
chooseCruiseFrame.setSize(300, 200);
chooseCruiseFrame.setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
chooseCruiseFrame.setVisible(true);
//////////// Creating contentPane
contentPane = new JPanel(new GridLayout(0, 1));
contentPane.setBackground(new java.awt.Color(255, 255, 255));
chooseCruiseFrame.add(contentPane);
chooseCruiseFrame.setVisible(true);
//////////// Creating CenterP
centerP = new JPanel();
centerP.setBackground(new java.awt.Color(255, 255, 255));
contentPane.add(centerP);
chooseCruiseFrame.add(contentPane);
chooseCruiseFrame.setVisible(true);
// Available From Calendar
JLabel availF = new JLabel("Available From:");
centerP.add(availF);
contentPane.add(centerP);
availablefromT = new JTextField(11);
centerP.add(availablefromT);
contentPane.add(centerP);
chooseCruiseFrame.add(contentPane);
chooseCruiseFrame.setVisible(true);
availFromDate = new JDateChooser();
JTextFieldDateEditor dateEditor = (JTextFieldDateEditor) availFromDate.getComponent(1);
dateEditor.setHorizontalAlignment(JTextField.RIGHT);
availFromDate.add(availablefromT);
centerP.add(availFromDate);
contentPane.add(centerP);
chooseCruiseFrame.add(contentPane);
chooseCruiseFrame.setVisible(true);
// Converting Date to String
SimpleDateFormat sdf = new SimpleDateFormat("dd-MM-yyyy");
String date = sdf.format(availFromDate.getDate());
availablefromT.setText(date);
}
}