자바 스윙 공부 중 Panel 전환에 대한 질문

Question

수강신청 프로그램을 자바 스윙으로 만들어보던 중 해결할 수 없는 문제점에 봉착하여 질문드립니다. 밑에 짜 놓은 코드는 PLogin이 먼저 나온 뒤 로그인 버튼을 누르면 PLogin의 setVisible값이 false로 변하여 PLogin 이 꺼지고 PSugangsincheong Panel이 나오도록 설계하였습니다. 근데 실행해서 로그인 버튼을 눌러보면 PLogin Panel이 꺼지기는 하지만 PSugangsincheong Panel이 나오지는 않고 하얀 화면이 나옵니다. 어떻게 해야 패널 전환을 시킬 수 있을까요??? 현재 PLogin은 카드레이아웃이고 PSugangsincheong은 Panel에 스크롤패널을 추가한 상태입니다.package Main; import javax.swing.JFrame; import Presentation.PLogin; import Presentation.PSugangsincheong; public class PMainFrame extends JFrame{ PLogin pLogin; PSugangsincheong pSugangsincheong; public PMainFrame() { pLogin = new PLogin(); pSugangsincheong = new PSugangsincheong(); this.setTitle("수강 신청 프로그램"); this.setDefaultCloseOperation(EXIT_ON_CLOSE); this.setSize(1200, 600); this.setLocationRelativeTo(null); this.add(pLogin); this.add(pSugangsincheong); pSugangsincheong.setVisible(false); } public static void main(String[] args) { PMainFrame PMF = new PMainFrame(); PMF.setVisible(true); } }package Presentation; import java.awt.CardLayout; import java.awt.FlowLayout; import java.awt.Font; import java.awt.GridBagConstraints; import java.awt.GridBagLayout; import java.awt.GridLayout; import java.awt.Insets; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.io.IOException; import javax.swing.JButton; import javax.swing.JLabel; import javax.swing.JOptionPane; import javax.swing.JPanel; import javax.swing.JPasswordField; import javax.swing.JTextField; import Control.CFind; import Control.CLogin; import Main.PMainFrame; import valueObject.VFind; import valueObject.VLogin; import valueObject.VResult; import valueObject.VUserInfo; public class PLogin extends JPanel{ VLogin vLogin; CLogin cLogin; VFind vFind; CFind cFind; //공통 private JButton change = new JButton("뒤로가기"); private JButton change1 = new JButton("뒤로가기"); //로그인페이지 컴포넌트 private JLabel name = new JLabel("Sign In"); private JLabel idLabel = new JLabel("ID:"); private JLabel pwLabel = new JLabel("PW:"); private JTextField idText = new JTextField(); private JPasswordField pwText = new JPasswordField(); private JButton loginBtn = new JButton("로그인"); private JButton idBtn = new JButton("아이디 찾기"); private JButton pwBtn = new JButton("비밀번호 찾기"); //아이디 찾기 컴포넌트 private JButton PreviousBtn = new JButton("아이디 찾기"); private JLabel name2 = new JLabel("아이디 찾기 | Find ID"); private JLabel userName = new JLabel("성명
(full name)"); private JLabel birthday = new JLabel("생년월일 6자리
(6 digits of date of birth)"); private JTextField FindIdName = new JTextField(); private JTextField FindIdBirth = new JTextField(); //비밀번호 찾기 페이지 컴포넌트 private JButton GoToFirst = new JButton("비밀번호 찾기"); private JLabel name3 = new JLabel("비밀번호 찾기 | Find Password"); private JLabel FindPwIdLabel = new JLabel("아이디
(ID)"); private JTextField FindPwIdText = new JTextField(); private JLabel FindPwBirthLabel = new JLabel("생년월일 6자리
(6 digits of date of birth)"); private JTextField FindPwBirthText = new JTextField(); public PLogin() { vLogin = new VLogin(); cLogin = new CLogin(); vFind = new VFind(); cFind = new CFind(); this.setVisible(true); //카드집 생성 JPanel cards = new JPanel(new CardLayout()); //로그인 페이지 JPanel card1 = new JPanel(); card1.setLayout(new GridBagLayout()); GridBagConstraints gbc = new GridBagConstraints(); Font NameFont = new Font("Sign In", Font.BOLD, 30); name.setFont(NameFont); //폰트 삽입 name.setHorizontalAlignment(JLabel.CENTER); //가운데 정렬 gbc.fill = GridBagConstraints.BOTH; gbc.weightx = 1; gbc.weighty = 1.0; gbc.insets = new Insets(1, 1, 1, 1); gbc.gridx = 0; gbc.gridy = 0; gbc.gridheight = 1; gbc.gridwidth = 3; card1.add(name, gbc); gbc.weightx = 0.3; gbc.weighty = 0.5; gbc.gridx = 0; gbc.gridy = 1; gbc.gridheight = 1; gbc.gridwidth = 1; card1.add(idLabel, gbc); gbc.gridx = 1; gbc.gridy = 1; gbc.gridheight = 1; gbc.gridwidth = 1; card1.add(idText, gbc); gbc.gridx = 2; gbc.gridy = 1; gbc.gridheight = 2; gbc.gridwidth = 1; card1.add(loginBtn, gbc); gbc.gridx = 0; gbc.gridy = 2; gbc.gridheight = 1; gbc.gridwidth = 1; card1.add(pwLabel, gbc); gbc.gridx = 1; gbc.gridy = 2; gbc.gridheight = 1; gbc.gridwidth = 1; card1.add(pwText, gbc); gbc.gridx = 0; gbc.gridy = 3; gbc.gridheight = 1; gbc.gridwidth = 1; card1.add(idBtn, gbc); gbc.gridx = 1; gbc.gridy = 3; gbc.gridheight = 1; gbc.gridwidth = 1; card1.add(pwBtn, gbc); //아이디 찾기 페이지 JPanel card2 = new JPanel(); card2.setLayout(new GridBagLayout()); GridBagConstraints gbc2 = new GridBagConstraints(); gbc2.fill = GridBagConstraints.BOTH; gbc2.insets = new Insets(2, 2, 2, 2); //격자 사이의 거리 gbc2.weightx = 0.3; gbc2.gridx = 0; gbc2.gridy = 0; card2.add(name2, gbc2); gbc2.gridheight = 1; gbc2.weightx = 0.1; gbc2.gridx = 0; gbc2.gridy = 1; card2.add(userName, gbc2); gbc2.gridx = 1; gbc2.gridy = 1; gbc2.gridwidth = 2; card2.add(FindIdName, gbc2); gbc2.gridwidth = 1; gbc2.gridx = 0; gbc2.gridy = 3; card2.add(birthday, gbc2); gbc2.gridwidth = 2; gbc2.gridx = 1; gbc2.gridy = 3; card2.add(FindIdBirth, gbc2); gbc2.gridwidth = 1; gbc2.gridheight = 1; gbc2.gridx = 2; gbc2.gridy = 4; card2.add(PreviousBtn, gbc2); gbc2.gridx = 1; gbc2.gridy = 4; card2.add(change, gbc2); //비밀번호 찾기 페이지 JPanel card3 = new JPanel(); card3.setLayout(new GridBagLayout()); GridBagConstraints gbc3 = new GridBagConstraints(); gbc3.fill = GridBagConstraints.BOTH; gbc3.insets = new Insets(2, 2, 2, 2); //격자 사이의 거리 gbc3.weightx = 0.3; gbc3.gridx = 0; gbc3.gridy = 0; card3.add(name3, gbc3); gbc3.gridheight = 1; gbc3.weightx = 0.1; gbc3.gridx = 0; gbc3.gridy = 1; card3.add(FindPwIdLabel, gbc3); gbc3.gridx = 1; gbc3.gridy = 1; gbc3.gridwidth = 2; card3.add(FindPwIdText, gbc3); gbc3.gridwidth = 1; gbc3.gridx = 0; gbc3.gridy = 3; card3.add(FindPwBirthLabel, gbc3); gbc3.gridwidth = 2; gbc3.gridx = 1; gbc3.gridy = 3; card3.add(FindPwBirthText, gbc3); gbc3.gridwidth = 1; gbc3.gridheight = 1; gbc3.gridx = 2; gbc3.gridy = 4; card3.add(GoToFirst, gbc3); gbc3.gridx = 1; gbc3.gridy = 4; card3.add(change1, gbc3); //카드집에 카드 추가 cards.add(card1, "Panel1"); cards.add(card2, "Panel2"); cards.add(card3, "Panel3"); this.add(cards); CardLayout cl = (CardLayout) cards.getLayout(); //------------------------- 버튼 기능 추가 ----------------------------------------------- loginBtn.addActionListener(new ActionListener() { //로그인 버튼 public void actionPerformed(ActionEvent e) { vLogin.setID(idText.getText()); //그릇에 정보 저장 vLogin.setPW(pwText.getText()); try { VUserInfo vUserInfo = cLogin.login(vLogin); //그릇 전달 if(vUserInfo.getName() != null) { JOptionPane.showMessageDialog(null, vUserInfo.getName()+"님 로그인되셨습니다."); setVisible(false); } else { JOptionPane.showMessageDialog(null, "회원 정보가 등록되어 있지 않습니다."); } } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); idBtn.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { cl.next(cards); } }); PreviousBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { vFind.setName(FindIdName.getText()); vFind.setBirtDay(FindIdBirth.getText()); try { VResult vResult = cFind.FindId(vFind); if (vResult.getId() != null) { JOptionPane.showMessageDialog(null, "회원님의 아이디는 " + vResult.getId() + "입니다." ); cl.first(cards); } else { JOptionPane.showMessageDialog(null, "회원 정보가 등록되어 있지 않습니다."); } } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); pwBtn.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { cl.last(cards); } }); GoToFirst.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { vFind.setId(FindPwIdText.getText()); vFind.setBirtDay(FindPwBirthText.getText()); try { VResult vResult = cFind.FindPw(vFind); if (vResult.getPw() != null) { JOptionPane.showMessageDialog(null, "회원님의 비밀번호는 " + vResult.getPw() + "입니다." ); cl.first(cards); } else { JOptionPane.showMessageDialog(null, "회원 정보가 등록되어 있지 않습니다."); } } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } } }); change.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { cl.first(cards); } }); change1.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { cl.first(cards); } }); } } package Presentation; import javax.swing.JPanel; import javax.swing.JScrollPane; import javax.swing.JTable; public class PSugangsincheong extends JPanel{ JTable table; JScrollPane scrollPane; String columnNames[] = { "상품번호", "상품이름", "상품가격", "상품설명" }; Object rowData[][] = { { 1, "맛동산", 100, "오리온" }, { 2, "아폴로", 200, "불량식품" }, { 3, "칸쵸코", 300, "과자계의 레전드" } }; public PSugangsincheong(){ table = new JTable(rowData, columnNames); scrollPane = new JScrollPane(table); this.add(scrollPane); } }

자바 스윙 공부 중 Panel 전환에 대한 질문

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