基础内容结束，存档

src/class44/LoginFarme.java

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+package class44;
+
+import javax.swing.*;
+import java.awt.event.ActionEvent;
+import java.awt.event.ActionListener;
+
+public class LoginFarme extends JFrame implements ActionListener {
+
+    public LoginFarme()
+    {
+        this.setTitle("登录界面");
+        this.setSize(400,300);
+        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        this.setVisible(true);
+
+        init();
+    }
+    private void init()
+    {
+        JPanel panel = new JPanel();
+        this.add(panel);
+        JButton btn = new JButton("登陆");
+        btn.addActionListener(this);
+        panel.add(btn);
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent e) {
+        JOptionPane.showMessageDialog(this,"点击了登陆按钮");
+    }
+}

src/class44/Test.java

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+package class44;
+
+public class Test {
+    public static void main(String[] args) {
+//        自定义窗口
+        LoginFarme lf = new LoginFarme();
+        lf.setVisible(true);
+    }
+
+}