feat: Menambahkan program baru

learn/advanced/Java-GUI/Swing/JPanel-with-JButton/JButtonJPanel.java

@@ -0,0 +1,23 @@
+import javax.swing.*;
+
+public class JButtonJPanel {
+    public static void main(String[] args) { 
+        SwingUtilities.invokeLater(new Runnable() { 
+            @Override 
+            public void run() { 
+                createAndShowGUI(); 
+            }
+        });
+    }
+    private static void createAndShowGUI() { 
+        JFrame frame = new JFrame("Ini adalah JFrame"); 
+        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
+        frame.setBounds(20, 30, 300, 100); 
+        frame.setLayout(null);
+
+        JButton button = new JButton("Click Me");
+        frame.getContentPane().add(button);
+        button.setBounds(20,20,200,20); 
+        frame.setVisible(true);
+    }
+}