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不重寫抽象方法的actionPerformed(ActionEvent的)
我已經嘗試了所有的可能性,但依然出現:選擇不是抽象和ActionListener的
select.java:4: error: Select is not abstract and does not override abstract method actionPerformed(ActionEvent) in ActionListener
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class Select extends JFrame implements ActionListener
{
JButton admin;
JButton user;
JPanel panel;
public Select()
{
admin=new JButton("admin");
user=new JButton("user");
panel=new JPanel(new GridLayout(3,1));
panel.add(admin);
panel.add(user);
//admin.addActionListener();
admin.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent a) {
Login page=new Login();
page.setVisible(true);
}
});
user.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent b) {
Login page=new Login();
page.setVisible(true);
}
});
}
}
class selection
{
public static void main(String arg[])
{
try
{
Select frame=new Select();
frame.setSize(300,200);
frame.setVisible(true);
}
catch(Exception e)
{
JOptionPane.showMessageDialog(null, e.getMessage());
}
}
}