import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
public class Myclass extends JFrame {
JFrame frm,frm2;
public void myclass(){
frm=new JFrame("登录界面");
frm.setSize(200,200);
frm.setLocation(20,20);
JPanel contentPane=new JPanel( );
setContentPane(contentPane);
JPanel secP1=new JPanel ();
JPanel secP2=new JPanel ();
contentPane.add(secP1,BorderLayout.CENTER);
contentPane.add(secP1,BorderLayout.SOUTH);
JTextField jt = new JTextField(10);
secP1.add(jt);
JLabel lab1 = new JLabel("账 号:");
JTextField tf = new JTextField(15);
JLabel lab2 = new JLabel("密 码:");
JPasswordField pwf = new JPasswordField(15);
contentPane.add(lab1);
contentPane.add(tf);
contentPane.add(lab2);
contentPane.add(pwf);
JButton btn = new JButton ("登录");
btn.addActionListener((ActionListener)this);
secP1.add(btn);
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setVisible(true);
frm2=new JFrame("计算界面");
frm2.setSize(200,200);
frm2.setLocationRelativeTo(null);
frm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frm.setVisible(false);
}
public static void main (String [] args){
new Myclass();
}
public void actionPerformed(ActionEvent args0){
if (args0.getActionCommand().equals("登录"));
frm. setVisible(false);
frm. setVisible(true);
}
}
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contentPane.add(secP1,BorderLayout.SOUTH);
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contentPane.add(secP1);
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