我的JPanels中有多个cardLayout。当我切换到另一个JPanel时，它不会关闭之前的JPanels，并且在使用该程序后我会在同一时间打开许多JPanels：
import javax.swing.*;
import java.awt.*;
import java.awt.CardLayout;
import java.awt.Component;
import java.awt.event.*;
public class guiFrames extends JFrame implements ActionListener{
public String name = "login";
public boolean isDev = false;
public boolean isMan = false;
public JButton loginSubmit, loginCancel,
newIssue, newUser, list,
detailsCancel, detailsSubmit, detailsAssign, detailsClose, detailsValidate, detailsFail,
addUserCancel, addUserSubmit;
public JPanel cardGUI;
public JTextField loginTxt, pwTxt, userTxt, userPWTxt, issueDetailsTxt;
public JComboBox userCmb;
public CardLayout cards;
public guiFrames(){
}
public Component inputFrame(){
JPanel inputPnl = new JPanel();
inputPnl.setLayout(new GridLayout(3,2));
JLabel loginLbl = new JLabel("Login");
inputPnl.add(loginLbl);
loginTxt = new JTextField();
inputPnl.add(loginTxt);
JLabel pwLbl = new JLabel("Password");
inputPnl.add(pwLbl);
pwTxt = new JTextField();
inputPnl.add(pwTxt);
JPanel buttonPnl = new JPanel();
buttonPnl.setLayout(new FlowLayout(FlowLayout.LEFT, 1,5));
loginSubmit = new JButton("Submit");
loginSubmit.addActionListener(this);
buttonPnl.add(loginSubmit);
loginCancel = new JButton("Cancel");
loginCancel.addActionListener(this);
buttonPnl.add(loginCancel);
JPanel container = new JPanel();
container.setLayout(new BorderLayout());
container.add(inputPnl, BorderLayout.CENTER);
container.add(buttonPnl, BorderLayout.SOUTH);
container.setVisible(true);
return container;
}
public Component issueList(){
JPanel listPnl = new JPanel();
JPanel listFlow = new JPanel();
listFlow.setLayout(new FlowLayout(FlowLayout.LEFT, 1,5));
newIssue = new JButton("New");
newIssue.addActionListener(this);
listFlow.add(newIssue);
list = new JButton("Issues");
list.addActionListener(this);
listFlow.add(list);
newUser = new JButton("Add User");
newUser.setVisible(isMan);
//newUser.setEnabled(false);
newUser.addActionListener(this);
listFlow.add(newUser);
JPanel container = new JPanel();
container.setLayout(new BorderLayout());
container.add(listFlow, BorderLayout.CENTER);
listPnl.add(container);
// listPnl.pack();
listPnl.setVisible(true);
// listPnl.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
return listPnl;
}
public Component issueDetails(){
JList list = new JList();
issueDetailsTxt = new JTextField();
issueDetailsTxt.addActionListener(this);
JPanel detailsFlow = new JPanel();
detailsFlow.setLayout(new FlowLayout(FlowLayout.LEFT, 1,5));
detailsCancel = new JButton("Cancel");
detailsCancel.addActionListener(this);
detailsFlow.add(detailsCancel);
detailsFlow.add(issueDetailsTxt);
detailsSubmit = new JButton("Submit");
detailsSubmit.addActionListener(this);
detailsFlow.add(detailsSubmit);
detailsAssign = new JButton("Assign");
detailsAssign.setVisible(isMan);
detailsAssign.addActionListener(this);
detailsFlow.add(detailsAssign);
detailsClose = new JButton("Close");
detailsClose.setVisible(isMan);
detailsClose.addActionListener(this);
detailsFlow.add(detailsClose);
detailsValidate = new JButton("Validate");
detailsValidate.setVisible(isDev);
detailsValidate.addActionListener(this);
detailsFlow.add(detailsValidate);
detailsFail = new JButton("Fail");
detailsFail.addActionListener(this);
detailsFlow.add(detailsFail);
detailsFail.setVisible(isDev);
JPanel container = new JPanel();
container.setLayout(new BorderLayout());
container.add(detailsFlow, BorderLayout.SOUTH);
container.add(list, BorderLayout.CENTER);
container.add(issueDetailsTxt, BorderLayout.NORTH);
container.setVisible(true);
return container;
}
public Component addUser(){
JPanel addUserGrid = new JPanel();
addUserGrid.setLayout(new GridLayout(3,2));
JLabel loginLbl = new JLabel("Login");
addUserGrid.add(loginLbl);
userTxt = new JTextField();
addUserGrid.add(userTxt);
JLabel pwLbl = new JLabel("Password");
addUserGrid.add(pwLbl);
userPWTxt = new JTextField();
addUserGrid.add(userPWTxt);
JLabel userLbl = new JLabel("User Type");
addUserGrid.add(userLbl);
userCmb = new JComboBox();
userCmb.addItem("User");
userCmb.addItem("Manager");
userCmb.addItem("Developer");
userCmb.addActionListener(this);
addUserGrid.add(userCmb);
JPanel addUserFlow = new JPanel();
addUserFlow.setLayout(new FlowLayout(FlowLayout.LEFT, 1,5));
addUserCancel = new JButton("Cancel");
addUserCancel.addActionListener(this);
addUserFlow.add(addUserCancel);
addUserSubmit = new JButton("Submit");
addUserSubmit.addActionListener(this);
addUserFlow.add(addUserSubmit);
JPanel container = new JPanel();
container.setLayout(new BorderLayout());
container.add(addUserFlow, BorderLayout.SOUTH);
container.add(addUserGrid, BorderLayout.CENTER);
container.setVisible(true);
return container;
}
public void cardView(){
JFrame cardFrame = new JFrame(name);
cardGUI = new JPanel();
cards = new CardLayout();
cardGUI.setLayout(cards);
cardGUI.add(inputFrame(), "login");
cardGUI.add(issueList(), "issueList");
cardGUI.add(issueDetails(), "issueDetails");
cardGUI.add(addUser(), "addUser");
cardFrame.add(cardGUI, BorderLayout.CENTER);
cardFrame.pack();
cardFrame.setVisible(true);
cardFrame.setDefaultCloseOperation(cardFrame.EXIT_ON_CLOSE);
cards.show(cardGUI, name);
}
public void actionPerformed(ActionEvent e){
if(e.getSource() == loginSubmit){
manager newUsr = new manager();
if(newUsr.loginValidation(loginTxt.getText(), pwTxt.getText())){
name = "issueList";
isMan = newUsr.isManager();
isDev = newUsr.isDeveloper();
System.out.println("User Type: "+isMan);
cardView();
}else{
loginTxt.setText("");
pwTxt.setText("");
}
}else if(e.getSource() == loginCancel){
loginTxt.setText(name);
pwTxt.setText("");
cardView();
//cards.show(cardGUI, "login");
}else if (e.getSource() == newIssue){//Goto New Issue Screen
name = "issueDetails";
cardView();
}else if(e.getSource() == newUser){
name = "addUser";
cardView();//Goto Add User Screen
}else if(e.getSource() == addUserCancel){//Go back to Issue List Screen
name = "issueList";
cardView();
}else if(e.getSource() == addUserSubmit){//Add user
manager newUsr = new manager();
newUsr.createUser(userTxt.getText(), userPWTxt.getText(), userCmb.getSelectedItem());
userTxt.setText("");
userPWTxt.setText("");
}else if(e.getSource() == list){//Goto Issue Details Screen
name = "issueDetails";
cardView();
}else if(e.getSource() == detailsCancel){//Go Back to Issue List Screen
name = "issueList";
cardView();
}else if(e.getSource() == detailsSubmit){
}else if(e.getSource() == detailsAssign){
}else if (e.getSource() == detailsClose){
}else if (e.getSource() == detailsValidate){
}else if (e.getSource() == detailsFail){
}
}
}
这是主文件：
public class testSerializable{
public static void main(String[] args){
manager newUsr = new manager();
newUsr.loadUserInfo();
guiFrames gui = new guiFrames();
gui.cardView();
}
}