登錄窗口： import javax.swing.*;import java.awt.*;public class Ld extends JFrame { public Ld() { this.setSize(300,220); this.setLayout(new BorderLayout()); Container con=this.getContentPane(); JPanel titlePanel = new JPanel(); con.add(titlePanel); JLabel a=new JLabel("歡迎使用成績管理系統"); a.setFont(new Font("隸書", Font.PLAIN, 22)); titlePanel.add(a); con.add(titlePanel,"North"); JLabel b=new JLabel("用戶名:"); b.setBounds(50, 20, 50, 20); JLabel c=new JLabel("密 碼:"); c.setBounds(50, 50, 50, 20); JTextField e=new JTextField(20); e.setBounds(110, 20, 120, 20); JPasswordField txtPwd=new JPasswordField(20); txtPwd.setBounds(110, 50, 120, 20); JPanel fieldPanel = new JPanel(); fieldPanel.setLayout(null); fieldPanel.add(b); fieldPanel.add(c); fieldPanel.add(e); fieldPanel.add(txtPwd); con.add(fieldPanel, "Center"); JPanel as = new JPanel(); JButton f=new JButton("登錄"); as.add(f); JButton g=new JButton("關閉"); as.add(g); con.add(as, "South"); this.setVisible(true); } public static void main(String[] args) { new Ld(); }} 效果：