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我有一个类LoginView这样的：如何在侦听器（java）中设置可见帧？
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.text.JTextComponent;
import java.util.Scanner;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.FileNotFoundException;
public class LoginView {
public static void main(String[] args) {
JFrame frame = new JFrame("Pagina di login");
frame.setSize(600, 300);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
placeComponents(frame);
frame.setVisible(true);
}
private static void placeComponents(JFrame frame) {
frame.setLayout(null);
JLabel userLabel = new JLabel("Username");
userLabel.setBounds(110, 10, 80, 25);
frame.add(userLabel);
JTextField userText = new JTextField(20);
userText.setBounds(200, 10, 180, 25);
frame.add(userText);
JLabel passwordLabel = new JLabel("Password");
passwordLabel.setBounds(110, 40, 80, 25);
frame.add(passwordLabel);
JPasswordField passwordText = new JPasswordField(20);
passwordText.setBounds(200, 40, 180, 25);
frame.add(passwordText);
JButton loginButton = new JButton("Login");
loginButton.setBounds(110, 80, 80, 25);
frame.add(loginButton);
JButton registerButton = new JButton("Registrati");
registerButton.setBounds(280, 80, 100, 25);
frame.add(registerButton);
ActionListener loginButtonListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String uname = userText.getText();
String pass = passwordText.getText();
boolean login_error=true;
if (pass.contains("admin") && uname.contains("admin")) {
JButton source = (JButton) e.getSource();
JOptionPane.showMessageDialog(source, "Username e password valide per admin. \n" +
"Sei entrato nel sistema come admin.");
login_error=false;
userText.setText(null);
passwordText.setText(null);
frame.dispose();
AdminView catalogo = new AdminView();
}
try {
BufferedReader br = new BufferedReader(new FileReader("cliente.txt"));
try {
String line;
while ((line = br.readLine()) != null) {
String[] snippet = line.split(",");
//System.out.println(snippet[0]+" "+snippet[1]);
if (snippet[0].equals(uname) && snippet[1].equals(pass)) {
JButton source = (JButton) e.getSource();
JOptionPane.showMessageDialog(source, "Username e password validi. \n" +
"Sei entrato nel negozio.");
login_error=false;
userText.setText(null);
passwordText.setText(null);
frame.dispose();
AdminView catalogo = new AdminView();
break;
}
}
} catch (IOException ioe){
JOptionPane.showMessageDialog(null, "cliente.txt not found", "login error", JOptionPane.ERROR_MESSAGE);
}
} catch (FileNotFoundException ex) {
JOptionPane.showMessageDialog(null, "cliente.txt not found", "login error", JOptionPane.ERROR_MESSAGE);
}
if (login_error == true) {
JOptionPane.showMessageDialog(null, "Username e password non validi.", "login error", JOptionPane.ERROR_MESSAGE);
userText.setText(null);
passwordText.setText(null);
}
}
};
ActionListener registerButtonListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
SignView registrazione = new SignView();
}
};
loginButton.addActionListener(loginButtonListener);
registerButton.addActionListener(registerButtonListener);
}
}
该类生成两个按钮，loginButton和registerButton。在登录ActionListener中，我检查这些文本字段，打开AdminView并执行它运行的代码。在注册ActionListener中，我打开SignupView，但是如果我执行代码，打开的框架不会出现。为什么？
这是SignupView类是不完整的，但它可能会出现：
import java.awt.Component;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;
import javax.swing.JPasswordField;
import javax.swing.JTextField;
import javax.swing.text.JTextComponent;
import java.util.Scanner;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.FileNotFoundException;
public class SignView {
public static void main(String[] args) {
JFrame frame = new JFrame("Pagina di Registrazione");
frame.setSize(500, 450);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
placeComponents(frame);
frame.setVisible(true);
}
private static void placeComponents(JFrame frame) {
frame.setLayout(null);
JLabel userLabel = new JLabel("Username");
userLabel.setBounds(10, 10, 80, 25);
frame.add(userLabel);
JTextField userText = new JTextField(20);
userText.setBounds(150, 10, 240, 25);
frame.add(userText);
JLabel passwordLabel = new JLabel("Password");
passwordLabel.setBounds(10, 40, 80, 25);
frame.add(passwordLabel);
JPasswordField passwordText = new JPasswordField(20);
passwordText.setBounds(150, 40, 240, 25);
frame.add(passwordText);
JLabel pwdLabel = new JLabel("Conferma password");
pwdLabel.setBounds(10, 70, 130, 25);
frame.add(pwdLabel);
JTextField pwdText = new JTextField(20);
pwdText.setBounds(150, 70, 240, 25);
frame.add(pwdText);
JLabel nameLabel = new JLabel("Nome");
nameLabel.setBounds(10, 100, 80, 25);
frame.add(nameLabel);
JTextField nameText = new JTextField(20);
nameText.setBounds(150, 100, 240, 25);
frame.add(nameText);
JLabel surnameLabel = new JLabel("Cognome");
surnameLabel.setBounds(10, 130, 80, 25);
frame.add(surnameLabel);
JTextField surnameText = new JTextField(20);
surnameText.setBounds(150, 130, 240, 25);
frame.add(surnameText);
JLabel cityLabel = new JLabel("Citta' di residenza");
cityLabel.setBounds(10, 160, 130, 25);
frame.add(cityLabel);
JTextField cityText = new JTextField(20);
cityText.setBounds(150, 160, 240, 25);
frame.add(cityText);
JLabel codeLabel = new JLabel("Codice fiscale");
codeLabel.setBounds(10, 190, 80, 25);
frame.add(codeLabel);
JTextField codeText = new JTextField(20);
codeText.setBounds(150, 190, 240, 25);
frame.add(codeText);
JLabel telLabel = new JLabel("Numero di telefono");
telLabel.setBounds(10, 220, 130, 25);
frame.add(telLabel);
JTextField telText = new JTextField(20);
telText.setBounds(150, 220, 240, 25);
frame.add(telText);
JLabel smartLabel = new JLabel("Numero di cellulare");
smartLabel.setBounds(10, 250, 130, 25);
frame.add(smartLabel);
JTextField smartText = new JTextField(20);
smartText.setBounds(150, 250, 240, 25);
frame.add(smartText);
JButton creationAccButton = new JButton("Crea account");
creationAccButton.setBounds(150, 280, 110, 25);
frame.add(creationAccButton);
JButton backLoginButton = new JButton("Ritorna al login");
backLoginButton.setBounds(270, 280, 120, 25);
frame.add(backLoginButton);
ActionListener creationAccButtonListener = new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
String user = userText.getText();
String passwd = passwordText.getText();
String passwdConfirm = pwdText.getText();
String uname = nameText.getText();
String cityRes = cityText.getText();
String taxCode = codeText.getText();
String telNumber = telText.getText();
String telSmartphone = smartText.getText();
boolean login_error=true;
try {
BufferedReader br = new BufferedReader(new FileReader("cliente.txt"));
try {
String line;
while ((line = br.readLine()) != null) {
String[] snippet = line.split(",");
//System.out.println(snippet[0]+" "+snippet[1]);
if (snippet[0].equals(user)) {
JButton source = (JButton) e.getSource();
JOptionPane.showMessageDialog(source, "Username gia' registrato.");
login_error=false;
userText.setText(null);
passwordText.setText(null);
break;
}
}
} catch (IOException ioe){
JOptionPane.showMessageDialog(null, "cliente.txt not found", "login error", JOptionPane.ERROR_MESSAGE);
}
} catch (FileNotFoundException ex) {
JOptionPane.showMessageDialog(null, "cliente.txt not found", "login error", JOptionPane.ERROR_MESSAGE);
}
if (login_error == true) {
JOptionPane.showMessageDialog(null, "Username e password non validi.", "login error", JOptionPane.ERROR_MESSAGE);
userText.setText(null);
passwordText.setText(null);
frame.dispose();
AdminView catalogo = new AdminView();
}
}
};
creationAccButton.addActionListener(creationAccButtonListener);
backLoginButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
JOptionPane.showMessageDialog((Component) e.getSource(),
"button has been pressed");
}
});
}
}