我是Java的新手，我遇到了一个问题。一旦我点击按钮，它就不会向我显示另一种形式，只是消失了。你可以看到，我设置了按钮ActionListener，但它只运行第二行（关闭当前表单）。
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.*;
public class login implements ActionListener {
public login(){
JFrame frame = new JFrame("Login");
frame.setLayout(new GridLayout(5,1));
JLabel label1 = new JLabel("User Name:");
JPanel panel1 = new JPanel();
frame.add(new JPanel());
frame.add(panel1);
panel1.add(label1);
JLabel label2 = new JLabel("Password:");
JPanel panel2 = new JPanel();
frame.add(panel2);
panel2.add(label2);
JPanel panel3 = new JPanel();
JButton button1 = new JButton("Register");
//button1.addActionListener(this);
JButton button2 = new JButton("Login");
//button2.addActionListener(this);
JButton button3 = new JButton("Cancel");
//button3.addActionListener(this);
panel3.add(button1);
panel3.add(button2);
panel3.add(button3);
frame.add(panel3);
JTextField JTF = new JTextField(12);
JPasswordField JPF = new JPasswordField(12);
panel1.add(JTF);
panel2.add(JPF);
frame.setResizable(false);
frame.setVisible(true);
frame.setSize(300, 200);
frame.setLocation(300,200);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
button1.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
new register();
frame.dispose();
}
});
}
public static void main(String[] args){
new login();
}
public void actionPerformed(ActionEvent e ){
}
}