✏️ Users

package LoginEx;

class User {
    private String id;
    private String pw;
    private String name;
    private String nickName;
    private String gender;

    public User(String id, String pw, String name, String nickName, String gender) {
        setId(id);
        setPw(pw);
        setName(name);
        setNickName(nickName);
        setGender(gender);
    }
    public User(String id) {
        setId(id);
    }

    public String getId() {
        return id;
    }
    public void setId(String id) {
        this.id = id;
    }
    public String getPw() {
        return pw;
    }
    public void setPw(String pw) {
        this.pw = pw;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getNickName() {
        return nickName;
    }
    public void setNickName(String nickName) {
        this.nickName = nickName;
    }
    public String getGender() {
        return gender;
    }
    public void setGender(String gender) {
        this.gender = gender;
    }
    @Override
    public boolean equals(Object o) {
        if(o == null || !(o instanceof User)) {
            return false;
        }
        User temp = (User)o;

        return id.equals(temp.getId());
    }

    @Override
    public String toString() {
        String info = "Id: " + id + "\n";
        info += "Pw: " + pw + "\n";
        info += "Name: " + name + "\n";
        info += "NickName: " + nickName + "\n";
        info += "gender: " + gender + "\n";
        return info;
    }
}

✏️ UserDataSet

• User들을 담은 배열 / 기능들

package LoginEx;

import java.util.ArrayList;

public class UserDataSet {
	private ArrayList<User> users;
	
	public UserDataSet() {
		users = new ArrayList<User>();
	}
	
	// 회원 추가
	public void addUsers(User user) {
	        users.add(user);
	}
	// 아이디 중복 확인
    public boolean isIdOverlap(String id) {
    	return users.contains(new User(id));
    }
    // 회원 삭제
	public void withdraw(String id) {
       users.remove(getUser(id));
    }
	// 유저 정보 가져오기
	public User getUser(String id) {
		return users.get(users.indexOf(new User(id)));
	}
	// 회원인지 아닌지 확인
	public boolean contains(User user) {
		return users.contains(user);
	}

}

✏️ LoginForm

• ID, Password 입력
  : 가입내용 기반
• 회원가입 및 로그인 기능 제공

package LoginEx;
import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.text.JTextComponent;

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;

public class LoginForm extends JFrame {
	
	private UserDataSet users;

    private JLabel lblId;
    private JLabel lblPw;
    private JTextField tfId;
    private JPasswordField tfPw;
    private JButton btnLogin;
    private JButton btnJoin;
    

    public LoginForm() {
    
    	users = new UserDataSet();

        init();
        setDisplay();
        addListeners();
        showFrame();
    }

    public void init() {
        // 사이즈 통합
        Dimension lblSize = new Dimension(80, 30);
        int tfSize = 10;
        Dimension btnSize = new Dimension(100, 25);

        lblId = new JLabel("ID");
        lblId.setPreferredSize(lblSize);
        lblPw = new JLabel("Password");
        lblPw.setPreferredSize(lblSize);

        tfId = new JTextField(tfSize);
        tfPw = new JPasswordField(tfSize);

        btnLogin = new JButton("Login");
        btnLogin.setPreferredSize(btnSize);
        btnJoin = new JButton("Join");
        btnJoin.setPreferredSize(btnSize);

    }
    public UserDataSet getUsers() {
    	return users;
    }
    
    public String getTfId() {
		return tfId.getText();
	}

    public void setDisplay() {
        // FlowLayout 왼쪽 정렬
        FlowLayout flowLeft = new FlowLayout(FlowLayout.LEFT);

        // pnlNorth(pnlId, pnlPw)
        JPanel pnlNorth = new JPanel(new GridLayout(0, 1));

        JPanel pnlId = new JPanel(flowLeft);
        pnlId.add(lblId);
        pnlId.add(tfId);

        JPanel pnlPw = new JPanel(flowLeft);
        pnlPw.add(lblPw);
        pnlPw.add(tfPw);

        pnlNorth.add(pnlId);
        pnlNorth.add(pnlPw);

        JPanel pnlSouth = new JPanel();
        pnlSouth.add(btnLogin);
        pnlSouth.add(btnJoin);

        pnlNorth.setBorder(new EmptyBorder(0, 20, 0, 20));
        pnlSouth.setBorder(new EmptyBorder(0, 0, 10, 0));

        add(pnlNorth, BorderLayout.NORTH);
        add(pnlSouth, BorderLayout.SOUTH);

    }

    public void addListeners() {

        btnJoin.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                setVisible(false);
                new JoinForm(LoginForm.this);
                tfId.setText("");
                tfPw.setText("");
            }
        });
        btnLogin.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // 아이디칸이 비었을 경우
                if (tfId.getText().isEmpty()) {
                    JOptionPane.showMessageDialog(LoginForm.this,
                            "아이디를 입력하세요.",
                            "로그인폼",
                            JOptionPane.WARNING_MESSAGE);

                    // 존재하는 아이디일 경우
                } else if (users.contains(new User(tfId.getText()))) {

                    // 비밀번호칸이 비었을 경우
                    if(String.valueOf(tfPw.getPassword()).isEmpty()) {
                        JOptionPane.showMessageDialog(
                                LoginForm.this,
                                "비밀번호를 입력하세요.",
                                "로그인폼",
                                JOptionPane.WARNING_MESSAGE);

                        // 비밀번호가 일치하지 않을 경우
                    } else if (!users.getUser(tfId.getText()).getPw().equals(String.valueOf(tfPw.getPassword()))) {
                        JOptionPane.showMessageDialog(
                                LoginForm.this,
                                "비밀번호가 일치하지 않습니다.");

                        // 다 완료될 경우
                    } else {
                        InformationForm infoForm = new InformationForm(LoginForm.this);
                        infoForm.setTaCheck(users.getUser(tfId.getText()).toString());
                        setVisible(false);
                        infoForm.setVisible(true);
                        tfId.setText("");
                        tfPw.setText("");
                    }
                    // 존재하지 않는 Id일 경우
                } else {
                    JOptionPane.showMessageDialog(
                            LoginForm.this,
                            "존재하지 않는 Id입니다."
                         
                    );
                
                }
            }
        });

        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent we) {
                int choice = JOptionPane.showConfirmDialog(
                        LoginForm.this,
                        "로그인 프로그램을 종료합니다.",
                        "종료",
                        JOptionPane.OK_CANCEL_OPTION,
                        JOptionPane.WARNING_MESSAGE
                );
                if (choice == JOptionPane.YES_OPTION) {
                    System.exit(0);
                }
            }
        });
    }

    public void showFrame() {
        setTitle("Login");
        pack();
        setLocationRelativeTo(null);
        setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);
        setResizable(false);
        setVisible(true);
    }

    public static void main(String[] args) {
        new LoginForm();
    }
}

✏️ JoinForm

• 각 정보입력
• 모든 입력정보가 필수
• ID는 중복해서 존재할 수 없음
• 비밀번호는 두 가지 입력이 동일한 경우만 가능
  : Password, Retry

package LoginEx;

import javax.swing.*;
import javax.swing.border.EmptyBorder;
import javax.swing.border.TitledBorder;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class JoinForm extends JDialog {
    private LoginForm owner;
    private UserDataSet users;

    
    private JLabel lblTitle;
    private JLabel lblId;
    private JLabel lblPw;
    private JLabel lblRe;
    private JLabel lblName;
    private JLabel lblNickName;
    private JRadioButton rbtnMale;
    private JRadioButton rbtnFemale;
    private JTextField tfId;
    private JPasswordField tfPw;
    private JPasswordField tfRe;
    private JTextField tfName;
    private JTextField tfNickName;
    private JButton btnJoin;
    private JButton btnCancel;

    public JoinForm(LoginForm owner) {
        super(owner, "Join", true);
        this.owner = owner;
        users = owner.getUsers();
        
        init();
        setDisplay();
        addListeners();
        showFrame();
    }
    private void init() {
        // 크기 고정
        int tfSize = 10;
        Dimension lblSize = new Dimension(80, 35);
        Dimension btnSize = new Dimension(100 ,25);


        lblTitle = new JLabel("- Input your information");
        lblTitle.setFont(new Font(Font.SANS_SERIF, Font.BOLD, 14));
        lblId = new JLabel("ID", JLabel.LEFT);
        lblId.setPreferredSize(lblSize);
        lblPw = new JLabel("Password", JLabel.LEFT);
        lblPw.setPreferredSize(lblSize);
        lblRe = new JLabel("Retry", JLabel.LEFT);
        lblRe.setPreferredSize(lblSize);
        lblName = new JLabel("Name", JLabel.LEFT);
        lblName.setPreferredSize(lblSize);
        lblNickName = new JLabel("NickName", JLabel.LEFT);
        lblNickName.setPreferredSize(lblSize);

        tfId = new JTextField(tfSize);
        tfPw = new JPasswordField(tfSize);
        tfRe = new JPasswordField(tfSize);
        tfName = new JTextField(tfSize);
        tfNickName = new JTextField(tfSize);

        rbtnMale = new JRadioButton("Male", true);
        rbtnFemale = new JRadioButton("Female");
        ButtonGroup group = new ButtonGroup();
        group.add(rbtnMale);
        group.add(rbtnFemale);

        btnJoin = new JButton("Join");
        btnJoin.setPreferredSize(btnSize);
        btnCancel = new JButton("Cancel");
        btnCancel.setPreferredSize(btnSize);

    }
    private void setDisplay() {
        // FlowLayout 왼쪽 정렬
        FlowLayout flowLeft = new FlowLayout(FlowLayout.LEFT);

        // pnlMain(pnlMNorth / pnlMCenter / pnlMSouth)
        JPanel pnlMain = new JPanel(new BorderLayout());

        // pnlMNorth(lblTitle)
        JPanel pnlMNorth = new JPanel(flowLeft);
        pnlMNorth.add(lblTitle);

        // pnlMCenter(pnlId / pnlPw / pnlRe / pnlName / pnlNickName)
        JPanel pnlMCenter = new JPanel(new GridLayout(0, 1));
        JPanel pnlId = new JPanel(flowLeft);
        pnlId.add(lblId);
        pnlId.add(tfId);

        JPanel pnlPw = new JPanel(flowLeft);
        pnlPw.add(lblPw);
        pnlPw.add(tfPw);

        JPanel pnlRe = new JPanel(flowLeft);
        pnlRe.add(lblRe);
        pnlRe.add(tfRe);

        JPanel pnlName = new JPanel(flowLeft);
        pnlName.add(lblName);
        pnlName.add(tfName);

        JPanel pnlNickName = new JPanel(flowLeft);
        pnlNickName.add(lblNickName);
        pnlNickName.add(tfNickName);

        pnlMCenter.add(pnlId);
        pnlMCenter.add(pnlPw);
        pnlMCenter.add(pnlRe);
        pnlMCenter.add(pnlName);
        pnlMCenter.add(pnlNickName);

        // pnlMSouth(rbtnMale / rbtnFemale)
        JPanel pnlMSouth = new JPanel(new FlowLayout(FlowLayout.CENTER));
        pnlMSouth.add(rbtnMale);
        pnlMSouth.add(rbtnFemale);
        pnlMSouth.setBorder(new TitledBorder("Gender"));

        // pnlMain
        pnlMain.add(pnlMNorth, BorderLayout.NORTH);
        pnlMain.add(pnlMCenter, BorderLayout.CENTER);
        pnlMain.add(pnlMSouth, BorderLayout.SOUTH);

        // pnlSouth(btnJoin / btnCancel)
        JPanel pnlSouth = new JPanel();
        pnlSouth.add(btnJoin);
        pnlSouth.add(btnCancel);

        // 화면 테두리의 간격을 주기 위해 설정 (insets 사용 가능)
        pnlMain.setBorder(new EmptyBorder(0, 20, 0, 20));
        pnlSouth.setBorder(new EmptyBorder(0, 0, 10, 0));

        add(pnlMain, BorderLayout.NORTH);
        add(pnlSouth, BorderLayout.SOUTH);
    }
    private void addListeners() {
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent we) {
                dispose();
                owner.setVisible(true);
            }
        });
        btnCancel.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                dispose();
                owner.setVisible(true);
            }
        });
        btnJoin.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                // 정보 하나라도 비어있으면
                if(isBlank()) {
                    JOptionPane.showMessageDialog(
                            JoinForm.this,
                            "모든 정보를 입력해주세요."
                    );
                    // 모두 입력했을 때
                } else {
                    // Id 중복일 때
                    if(users.isIdOverlap(tfId.getText())) {
                        JOptionPane.showMessageDialog(
                                JoinForm.this,
                                "이미 존재하는 Id입니다."
                        );
                        tfId.requestFocus();

                        // Pw와 Re가 일치하지 않았을 때
                    } else if(!String.valueOf(tfPw.getPassword()).equals(String.valueOf(tfRe.getPassword()))) {
                        JOptionPane.showMessageDialog(
                                JoinForm.this,
                                "Password와 Retry가 일치하지 않습니다."
                        );
                        tfPw.requestFocus();
                    } else {
                        users.addUsers(new User(
                                tfId.getText(),
                                String.valueOf(tfPw.getPassword()),
                                tfName.getText(),
                                tfNickName.getText(),
                                getGender())
                        );
                        JOptionPane.showMessageDialog(
                                JoinForm.this,
                                "회원가입을 완료했습니다!"
                        );
                        dispose();
                        owner.setVisible(true);
                    }
                }
            }
        });
    }
    public boolean isBlank() {
        boolean result = false;
        if(tfId.getText().isEmpty()) {
            tfId.requestFocus();
            return true;
        }
        if(String.valueOf(tfPw.getPassword()).isEmpty()) {
            tfPw.requestFocus();
            return true;
        }
        if(String.valueOf(tfRe.getPassword()).isEmpty()) {
            tfRe.requestFocus();
            return true;
        }
        if(tfName.getText().isEmpty()) {
            tfName.requestFocus();
            return true;
        }
        if(tfNickName.getText().isEmpty()) {
            tfNickName.requestFocus();
            return true;
        }
        return result;
    }
    
    public String getGender() {
        if(rbtnMale.isSelected()) {
            return rbtnMale.getText();
        }
        return rbtnFemale.getText();
    }

    private void showFrame() {
        pack();
        setLocationRelativeTo(owner);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setResizable(false);
        setVisible(true);
    }
}

✏️ InformationForm

package LoginEx;

import javax.swing.*;
import javax.swing.border.LineBorder;
import javax.swing.border.TitledBorder;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

public class InformationForm extends JDialog {
    private LoginForm owner;
    private UserDataSet users;
    
    private JTextArea taCheck;
    private JButton btnLogout;
    private JButton btnWithdraw;
    private JoinForm joinForm;

    public InformationForm(LoginForm owner) {
        super(owner, "Information", true);
        this.owner = owner;
        users = owner.getUsers();

        init();
        setDisplay();
        addListeners();
        showFrame();

    }
    private void init() {
        Dimension btnsize = new Dimension(100, 25);

        taCheck = new JTextArea(10, 30);
        taCheck.setEditable(false);

        btnLogout = new JButton("Logout");
        btnLogout.setPreferredSize(btnsize);

        btnWithdraw = new JButton("withdraw");
        btnWithdraw.setPreferredSize(btnsize);
    }
    private void setDisplay() {

        LineBorder lBorder = new LineBorder(Color.GRAY, 1);
        TitledBorder border = new TitledBorder(lBorder, "check your Information");
        taCheck.setBorder(border);

        JPanel pnlSouth = new JPanel();
        pnlSouth.add(btnLogout);
        pnlSouth.add(btnWithdraw);

        JPanel pnlMain = new JPanel(new BorderLayout());
        pnlMain.add(new JScrollPane(taCheck), BorderLayout.NORTH);
        pnlMain.add(pnlSouth, BorderLayout.CENTER);

        add(pnlMain,BorderLayout.CENTER);
    }
    private void addListeners() {
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent we) {
                dispose();
            }
        });

        btnWithdraw.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                users.withdraw(owner.getTfId());
                JOptionPane.showMessageDialog(
                        InformationForm.this,
                        "회원 정보가 삭제되었습니다. 안녕히가세요."
                );
                dispose();
                owner.setVisible(true);
            }
        });
        btnLogout.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent ae) {
                JOptionPane.showMessageDialog(
                        InformationForm.this,
                        "로그아웃 되었습니다."
                );
                dispose();
                owner.setVisible(true);
            }
        });
    }
    public void setTaCheck(String userInfo) {
        taCheck.setText(userInfo);
    }

    private void showFrame() {
        pack();
        setLocationRelativeTo(owner);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setResizable(false);
    }
}