How do I set up a sequential search

  public class Assignment implements ActionListener{

        private JPanel panel;
        private JLabel label, label2;
        private JTextField text, text2;
        private JButton button, clear;
        private String[] numbers = { "5658845, 4520125, 7895122, 8777541, 8451277, 1302850, 8080152, 4562555, 5552012, 5050552, 7825877, 1250255, 1005231, 6545231, 3852085, 7576651, 7881200, 4581002" };
    
    public Assignment(){
        JFrame gui = new JFrame();
        gui.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        gui.setTitle("College Expenses");
        gui.setSize(325, 150);
        panel = new JPanel(new GridLayout(3, 2));
        gui.add(panel);
        gui.setVisible(true);
        label = new JLabel("Charge Card Number");
        label2 = new JLabel("Results");
        text = new JTextField("" , 10);
        text2 = new JTextField("" , 10);
        text2.setEditable(false);
        button = new JButton("Enter");
        clear = new JButton("Clear");
        
        panel.add(label);
        panel.add(text);
        panel.add(label2);
        panel.add(text2);
        panel.add(clear);
        clear.addActionListener(this);
        panel.add(button);
        button.addActionListener(this);
        
        }


           
    public static void main(String[] args) {
        new Assignment();
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        String action = e.getActionCommand();
        if (action.equals("Clear")) {
	            text.setText("");
                    text2.setText("");
	        }
        else if (action.equals("Enter")) {
            
            
        }
            
    }
}