A hack to make a JTextField really 2 columns wide

    
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTextField;

public class WidthHack {

  public static void main(String[] args) {

    JTextField tf = new JTextField("mm");
    tf.setPreferredSize(tf.getPreferredSize());
    tf.setText("");

    JPanel pHacked = new JPanel();
    pHacked.setBorder(new javax.swing.border.TitledBorder("hacked 2 columns"));
    pHacked.add(tf);

    JPanel pStock = new JPanel();
    pStock.setBorder(new javax.swing.border.TitledBorder("stock 2 columns"));
    pStock.add(new JTextField(2));

    JFrame frame = new JFrame();
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().setLayout(new java.awt.GridLayout(0, 1));
    frame.getContentPane().add(pHacked);
    frame.getContentPane().add(pStock);
    frame.setSize(150, 150);
    frame.setVisible(true);
    tf.requestFocus();
  }
}

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A hack to make a JTextField really 2 columns wide : TextField « Swing JFC « Java

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