如何调整JTextField的大小？

Question

我有JTextField的问题，我无法设置其大小。当我运行程序时，它在整个屏幕上显示我的文本字段。我想让JTextField变小。你知道问题在哪里吗？ （抱歉我的英语不好）

我的问题是我设置了JTextField的大小，但它不起作用。

public class MyJFrame extends JFrame {
    JLabel label;
    String Time = "00:34:12.123";
    JPanel MainPanel = new JPanel();
    JPanel PINPanel = new JPanel();
    JPanel MenuPanel = new JPanel();
    JPanel CashPanel = new JPanel();
    JPanel WaitPanel = new JPanel();
    JPanel TimePanel = new JPanel();

    JButton Cash = new JButton();
    JButton Time1 = new JButton();
    JButton ConfirmPIN = new JButton();
    JButton ConfirmCash = new JButton();
    JButton ConfirmWait = new JButton();
    JLabel PIN = new JLabel();

    JTextField EnterPIN = new JTextField(1);
    CardLayout CL = new CardLayout();

    public MyJFrame(){
        super();
        initUI();
        placeComponents();
        bindListeners();
    }

    private void initUI() {
        this.setSize(385, 400);
        this.setTitle("ITS class");
        this.setLocationRelativeTo(null);
        this.setDefaultCloseOperation(EXIT_ON_CLOSE);
        this.setResizable(false);
    }
    private void placeComponents(){

        PINPanel.setLayout(new BorderLayout());

        MainPanel.setLayout(CL);
        MainPanel.add(PINPanel, "1");
        CL.show(MainPanel, "1");

        ConfirmPIN.setText("Ok");
        ConfirmPIN.setSize(1,1);
        ConfirmPIN.setLocation(150,200);

        PIN.setText("Please enter your PIN: ");
        PIN.setLocation(20,100);

        EnterPIN.setLocation(50,100);
        EnterPIN.setSize (10, 10);

        this.getContentPane().add(MainPanel);
        PINPanel.add(ConfirmPIN);
        PINPanel.add(PIN);
        PINPanel.add(EnterPIN);