import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JTextField; public class Main { public static void main(String[] args) { JTextField tf = new JTextField("mm"); tf.setPreferredSize(tf.getPreferredSize()); tf.setText(""); JPanel pHacked = new JPanel(); pHacked.add(tf); JPanel pStock = new JPanel(); pStock.add(new JTextField(2)); JFrame frame = new JFrame(); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setLayout(new java.awt.GridLayout(0, 1)); frame.add(pHacked); frame.add(pStock); frame.setSize(150, 150); frame.setVisible(true); tf.requestFocus(); } }