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I tried to add a button to the JFrame, but it won't appear for some reason. How do I make it appear?

import javax.swing.JLabel;
import javax.swing.JTextField;
import javax.swing.JPanel;
import javax.swing.SwingConstants;
import javax.swing.border.Border;
import javax.swing.BorderFactory;
import java.awt.Color;
import java.awt.Container;
import java.awt.Rectangle;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.*;

public class GraficoconArreglo extends javax.swing.JFrame {
 JPanel pan = (JPanel) this.getContentPane();
 JLabel lab = new JLabel[6];
 JTextField text = new JTextField[6];
 Border border = BorderFactory.createLineBorder(Color.pink,1);
 JButton b = new JButton("Calculate");

public GraficoconArreglo() 
 initComponents();
 pan.setLayout(null);
 pan.setBackground(Color.GRAY);
 for(int i=0; i<lab.length ;i++)
 lab[i] = new JLabel();
 text[i] = new JTextField();

 lab[i].setBounds(new Rectangle(15,(i+1)*40, 60, 25));
 lab[i].setText("Data " + (i+1));
 lab[i].setBorder(border);
 text[i].setBounds(new Rectangle(100,(i+1)*40, 60, 25));

 pan.add(lab[i],null);
 pan.add(text[i],null);

 setSize(200,330);
 setTitle("Arrays in forums.");

 add(b);
 b.addActionListener((ActionListener) this);
 

You are creating only one button and adding it to 6 different places. Therefore, you only would see it on the last place you added.

You should add the button to the contentPane, not the JFrame. A working code for this, provided from SwingDesigner from Eclipse Marketplace would be:

public class Window extends JFrame 

private JPanel contentPane;

/**
 * Launch the application.
 */
public static void main(String args) 
 EventQueue.invokeLater(new Runnable() 
 public void run() 
 try 
 Window frame = new Window();
 frame.setVisible(true);
 catch (Exception e) 
 e.printStackTrace();
 
 
 );


/**
 * Create the frame.
 */
public Window() 
 setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 setBounds(100, 100, 450, 300);
 contentPane = new JPanel();
 contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
 contentPane.setLayout(null);
 setContentPane(contentPane);

 JButton btnNewButton = new JButton("New button");
 btnNewButton.setBounds(170, 110, 89, 23);
 contentPane.add(btnNewButton);