我想在单击按钮时更改JDialog（其他类）上的Jlabels文本。
这段代码有点长，因为我只是java的新手。请耐心等待我
import javax.swing.*;
import javax.swing.border.CompoundBorder;
import java.awt.*;
import java.awt.event.*;
public class HotelRoomsGUI extends JPanel{
private JTabbedPane mainJTP;
private JPanel classicTab,deluxeTab,presidentialTab,classicSubPanel,deluxeSubPanel,presidentialSubPanel;
private String classicRoomNo[] = {"101","102","103","104","105","106","107","108","109","101","111","112"};
private String deluxeRoomNo[] = {"201","202","203","204","205","206","207","208","209","201","211","212"};
private String presidentialRoomNo[] = {"301","302","303","304","305","306","307","308","309","301","311","312"};
private JButton[] classicRoom, deluxeRoom, presidentialRoom;
private JLabel[] inputLabels;
ButtonHandler bh;
public HotelRoomsGUI(){
setLayout(null);
setBackground(new Color(90,90,90));
add(tabbedPane());
}
public JPanel classic()
{
classicTab = new JPanel();
classicTab.setBackground(new Color(70,70,70));
classicTab.setLayout(null);
classicSubPanel();
return classicTab;
}
public JPanel classicSubPanel()
{
classicSubPanel = new JPanel();
classicSubPanel.setBounds(10,10,605,455);
classicSubPanel.setLayout(new GridLayout(4,3,10,10));
classicSubPanel.setBackground(new Color(70,70,70));
classicTab.add(classicSubPanel);
return classicTab;
}
public JPanel deluxe()
{
deluxeTab = new JPanel();
deluxeTab.setBackground(new Color(70,70,70));
deluxeTab.setLayout(null);
deluxeSubPanel();
return deluxeTab;
}
public JPanel deluxeSubPanel()
{
deluxeSubPanel = new JPanel();
deluxeSubPanel.setBounds(10,10,605,455);
deluxeSubPanel.setLayout(new GridLayout(4,3,10,10));
deluxeSubPanel.setBackground(new Color(70,70,70));
deluxeTab.add(deluxeSubPanel);
return deluxeSubPanel;
}
public JPanel presidential()
{
presidentialTab = new JPanel();
presidentialTab.setBackground(new Color(70,70,70));
presidentialTab.setLayout(null);
presidentialSubPanel();
return presidentialTab;
}
public JPanel presidentialSubPanel()
{
presidentialSubPanel = new JPanel();
presidentialSubPanel.setBounds(10,10,605,455);
presidentialSubPanel.setLayout(new GridLayout(4,3,10,10));
presidentialSubPanel.setBackground(new Color(70,70,70));
presidentialTab.add(presidentialSubPanel);
return presidentialSubPanel;
}
//Holder of buttons
public JTabbedPane tabbedPane()
{
UIManager.put("TabbedPane.selected", Color.ORANGE);
mainJTP = new JTabbedPane();
mainJTP.setBackground(Color.WHITE);
mainJTP.setBounds(3,1,630,500);
mainJTP.addTab("Classic",classic());
mainJTP.addTab("Deluxe",deluxe());
mainJTP.addTab("Presidential",presidential());
rooms();
return mainJTP;
}
//Labels that will be display on the RoomProfile class
public JLabel[] inputLabels()
{
inputLabels = new JLabel[10];
for(int x = 0; x<inputLabels.length;x++)
{
inputLabels[x] = new JLabel();
inputLabels[x].setForeground(Color.WHITE);
}
return inputLabels;
}
public void rooms()
{
bh = new ButtonHandler();
presidentialRoom = new JButton[presidentialRoomNo.length];
deluxeRoom = new JButton[deluxeRoomNo.length];
classicRoom = new JButton[classicRoomNo.length];
for(int x = 0;x<classicRoomNo.length;x++){
//classic rooms
ImageIcon imageC = new ImageIcon("C:\\Users\\John\\workspace" +
"\\SystemTest\\src\\Images\\classicRooms.JPG"); // image
classicRoom[x] = new JButton(classicRoomNo[x],imageC);
classicRoom[x].setBackground(Color.WHITE);
classicRoom[x].setBorder(new CompoundBorder(BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY),
BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY)));
classicRoom[x].addActionListener(bh);
classicSubPanel.add(classicRoom[x]);
//deluxe rooms
ImageIcon imageD = new ImageIcon("C:\\Users\\John\\workspace" +
"\\SystemTest\\src\\Images\\deluxeRooms.JPG"); // image
deluxeRoom[x] = new JButton(deluxeRoomNo[x],imageD);
deluxeRoom[x].setBackground(Color.WHITE);
deluxeRoom[x].setBorder(new CompoundBorder(BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY),
BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY)));
deluxeRoom[x].addActionListener(bh);
deluxeSubPanel.add(deluxeRoom[x]);
//presidential rooms
ImageIcon imageP = new ImageIcon("C:\\Users\\John\\workspace" +
"\\SystemTest\\src\\Images\\presidentialRooms.JPG"); // image
presidentialRoom[x] = new JButton(presidentialRoomNo[x],imageP);
presidentialRoom[x].setBackground(Color.WHITE);
presidentialRoom[x].setBorder(new CompoundBorder(BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY),
BorderFactory.createEtchedBorder(Color.WHITE,Color.GRAY)));
presidentialRoom[x].addActionListener(bh);
presidentialSubPanel.add(presidentialRoom[x]);
}
}
public class ButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
//to get what button is accessed
Room room = new Room(e.getActionCommand());
//get all info using the room no. got from getActionCommand();
GuestsInfo info = new GuestsInfo(room.getGuestID());
String data[] = {info.getFirstName()+" "+info.getLastName(),info.getAge(),info.getGender(),
info.getContactNo(),"Today",info.getTime(),"Tomorrow",room.getRoomNo(),room.getRoomType()};
RoomProfile prof = new RoomProfile();
if(prof.isVisible())
{
System.out.print("test");
}
else
{
//setting text on label
prof.setVisible(true);
inputLabels();
for(int i = 0; i<data.length; i++){
inputLabels[i].setText(" "+data[i]);
System.out.println(""+data[i]);
}
}
}
}
}
这是RoomProfile类的代码
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class RoomProfile extends JDialog{
private JLabel[] labels;
JLabel inputLabels[];
private String topTextLabels[] = {"Fullname","Age","Gender","Address","Contact No","Arrival", "Time in", "Departure","Room No","Room Type"};
private JButton okB;
private JPanel subFrame,topPanel, bottomLeftPanel,bottomRightPanel;
private JLabel designLabel;
private ButtonHandler bh;
private HotelRoomsGUI label = new HotelRoomsGUI();
public RoomProfile() {
setLayout(null);
setModal(true);
setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE);
setBackground(new Color(80,80,80));
setContentPane(setSubFrame());
setSize(600,500);
setLocationRelativeTo(null);
}
public JPanel setSubFrame()
{
createLabels();
buttons();
designLabel();
subFrame = new JPanel();
subFrame.setBounds(0,0,600,500);
subFrame.setBackground(new Color(90,90,90));
subFrame.setLayout(null);
subFrame.add(setTopPanel());
subFrame.add(setBottomRightPanel());
subFrame.add(setBottomLeftPanel());
subFrame.add(okB);
subFrame.add(designLabel);
return subFrame;
}
public void designLabel()
{
ImageIcon img = new ImageIcon("C:\\Documents and Settings\\Janpol\\workspace\\HotelGUI\\src\\Images\\Account.JPG");
designLabel = new JLabel(img);
designLabel.setBounds(380,27,190,190);
designLabel.setBorder(BorderFactory.createEtchedBorder(Color.GRAY,Color.BLACK));
}
// this is where i added some of the labels
public JPanel setTopPanel()
{
topPanel = new JPanel();
topPanel.setLayout(new GridLayout(5,1));
topPanel.setBounds(20,20,350,200);
topPanel.setBackground(new Color(90,90,90));
topPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(Color.GRAY,Color.BLACK)
,"Personal Information",1,2,new Font("Arial",Font.BOLD,13),Color.ORANGE));
JLabel[] top = label.inputLabels();
for(int x = 0; x<5; x++)
{
topPanel.add(labels[x]);
topPanel.add(top[x]);
}
return topPanel;
}
// also here
public JPanel setBottomLeftPanel()
{
bottomLeftPanel = new JPanel();
bottomLeftPanel.setLayout(new GridLayout(3,2));
bottomLeftPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(Color.GRAY,Color.BLACK)
,"Stay Information",1,2,new Font("Arial",Font.BOLD,13),Color.ORANGE));
bottomLeftPanel.setBackground(new Color(90,90,90));
bottomLeftPanel.setBounds(20,250,300,140);
JLabel[] bot = label.inputLabels();
for(int x = 5; x<8; x++)
{
bottomLeftPanel.add(labels[x]);
bottomLeftPanel.add(bot[x]);
}
return bottomLeftPanel;
}
// lastly here
public JPanel setBottomRightPanel()
{
bottomRightPanel = new JPanel();
bottomRightPanel.setLayout(new GridLayout(2,2));
bottomRightPanel.setBorder(BorderFactory.createTitledBorder(BorderFactory.createEtchedBorder(Color.GRAY,Color.BLACK)
,"Personal Information",1,2,new Font("Arial",Font.BOLD,13),Color.ORANGE));
bottomRightPanel.setBackground(new Color(90,90,90));
bottomRightPanel.setBounds(350,250,200,140);
JLabel[] right = label.inputLabels();
for(int x = 8; x<10; x++)
{
bottomRightPanel.add(labels[x]);
bottomRightPanel.add(right[x]);
}
return bottomRightPanel;
}
public JLabel[] createLabels()
{
labels = new JLabel[topTextLabels.length];
for(int x = 0; x<topTextLabels.length;x++)
{
labels[x] = new JLabel(topTextLabels[x]);
labels[x].setForeground(Color.WHITE);
}
return labels;
}
public void buttons()
{
bh = new ButtonHandler();
okB = new JButton("Ok");
okB.setBounds(400,400,100,50);
okB.addActionListener(bh);
}
public class ButtonHandler implements ActionListener
{
public void actionPerformed(ActionEvent e)
{
dispose();
}
}
}
这是课堂
import java.sql.*;
public class Room
{
private String roomType, availability, roomNo, Rate;
private int guestID;
private Connection con;
private PreparedStatement statement = null;
public Room(){
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/3moronsdb","root","");
}
catch (Exception e) {
e.printStackTrace();
}
}
public Room(int id)
{
this();
try{
statement = con.prepareStatement("SELECT * FROM room WHERE guestID=?");
statement.setInt(1, id);
ResultSet rs = statement.executeQuery();
while(rs.next()){
this.guestID = rs.getInt(1);
this.roomType = rs.getString(2);
this.roomNo = rs.getString(3);
this.Rate = rs.getString(4);
this.availability= rs.getString(5);
}
}catch(Exception e){
System.out.print(e);
}
}
//Constructor for setting rate
public Room(String roomTypeL, String roomNoL , String RateL, String availabilityL)
{
this();
try
{
statement = con.prepareStatement("Insert into room(roomType, roomNo, rate,availability) values(?,?,?,?)");
statement.setString(1, roomTypeL);
statement.setString(2, roomNoL);
statement.setString(3, RateL);
statement.setString(4, availabilityL);
statement.executeUpdate();
}
catch(Exception e)
{
e.printStackTrace();
return;
}
}
public Room(String roomNo){
this();
try{
statement = con.prepareStatement("SELECT * FROM room WHERE roomNo=?");
statement.setString(1, roomNo);
ResultSet rs = statement.executeQuery();
while(rs.next()){
this.guestID = rs.getInt(1);
this.roomType = rs.getString(2);
this.roomNo = rs.getString(3);
this.Rate = rs.getString(4);
this.availability= rs.getString(5);
}
}
catch(Exception e)
{
e.printStackTrace();
return;
}
}
//get guestID from the database
public int getGuestID(){
return this.guestID;
}
//getting roomType
public String getRoomType(){
return this.roomType;
}
//getting roomNo
public String getRoomNo(){
return this.roomNo;
}
//getting rate
public String getRate(){
return this.Rate;
}
//getting availability
public String getAvailability(){
return this.availability;
}
}
以下是GuestInformation的类
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
public class GuestsInfo
{
private String firstName, lastName, gender, address, time, deposit, age, contactNo, stay;
private int guestID;
private Connection con;
private PreparedStatement statement;
//default constructor
public GuestsInfo()
{
try {
Class.forName("com.mysql.jdbc.Driver");
con = DriverManager.getConnection(
"jdbc:mysql://localhost:3306/3moronsdb","root","");
}
catch (Exception e) {
e.printStackTrace();
}
}
public GuestsInfo(int guestID)
{
this();
try{
statement = con.prepareStatement("SELECT * FROM guest WHERE guestID=?");
statement.setInt(1, guestID);
ResultSet rs = statement.executeQuery();
while(rs.next()){
this.guestID = rs.getInt(1);
this.firstName = rs.getString(2);
this.lastName = rs.getString(3);
this.age = rs.getString(4);
this.gender= rs.getString(5);
this.address= rs.getString(6);
this.contactNo = rs.getString(7);
this.time= rs.getString(8);
this.stay = rs.getString(9);
this.deposit = rs.getString(10);
System.out.print(firstName +""+ lastName +""+ age +""+ gender +""+ address +""+ contactNo +""+
time +""+ stay +""+ deposit);
}
}catch(Exception e){}
}
public GuestsInfo(String firstName, String lastName, String age, String gender,
String address, String contactNo, String time, String stay, String deposit)
{
this();
try
{
statement = con.prepareStatement("Insert into guest(firstName,lastName,age,gender,address,contactNo,time,stay,deposit)values(?,?,?,?,?,?,?,?,?)");
statement.setString(1, firstName);
statement.setString(2, lastName);
statement.setString(3, age);
statement.setString(4, gender);
statement.setString(5, address);
statement.setString(6, contactNo);
statement.setString(7, time);
statement.setString(8, stay);
statement.setString(9, deposit);
statement.executeUpdate();
}
catch(Exception e)
{
e.printStackTrace();
return;
}
}
//get guestID from the database
public int getGuestID(){
return guestID;
}
//get firstName from the database
public String getFirstName(){
return this.firstName;
}
//get lastName from the database
public String getLastName(){
return lastName;
}
//get age from the database
public String getAge(){
return this.age;
}
//get gender from the database
public String getGender(){
return this.gender;
}
//get address from database
public String getAddress(){
return this.address;
}
//get contactNo from the database
public String getContactNo(){
return this.contactNo;
}
//get time from database
public String getTime()
{
return this.time;
}
//get stay from database
public String getStay()
{
return this.stay;
}
//get roomType from database
public String getDeposit()
{
return this.deposit;
}
}
我不知道为什么标签不显示文字。请帮我。先感谢您 还要感谢你和我一起承担
感谢那些帮助我的人。谢谢
答案 0 :(得分：2)
我的猜测是：在actionPerformed()处理程序中，您致电inputLabels();。这似乎是实例化JLabel个新对象并将其分配给inputLabels字段。但是，不将这些对象添加到面板中。这只是在第一次创建标签时在setBottomLeftPanel()中完成的。
因此，请确保actionPerformed()中的代码在setText()中定义的标签上调用setBottomLeftPanel()（并已包含在面板中）。
编辑（发布完整代码后）：
有很多事情是错误的。现在，解决您的问题：
1）在RoomProfile中，创建一个字段JLabel[] bottomLeftPanelFields;，并将您在setBottomRightPanel()中创建的标签指定给它。
2）在该字段（getBottomLeftPanelFields()）
3）将您的actionPerformed()修改为：
...
JLabel[] bottomLeftFields = prof.getBottomLeftPanelFields();
for(int i = 0; i<data.length; i++){
bottomLeftFields[i].setText(" "+data[i]);
}
//setting text on label
prof.setVisible(true);
...
也就是说，在调用setVisible()之前设置字段（这是您以模态方式显示“房间”对话框的位置）。
从此刻开始，应该显示标签。
更进一步：
a）可能为其他标签（顶部等）做类似的事情。
b）摆脱两个inputLabels字段。每次调用inputLabels()时都会重写一次，同时实例化RoomProfile三次。其他根本不需要。另请注意，即使每次都需要不同数量的标签，inputLables()方法始终会创建10个对象。
c）或许可以获得有关Swing和Java设计模式的教程（Oracle网站上有一些）。这有助于理解如何构建事物。
答案 1 :(得分：0)
我认为问题出在这一行：
JLabel[] bot = label.inputLabels();
这是在将所有这些标签添加到面板之前重新实例化它们。尝试：
JLabel[] bot = inputLabels;
这里的困惑在于，很难从摘录中判断出首先执行的是什么，但我认为这是您意外行为发生的地方。