How to disable resizing of textField in java swing?

Question

I have a GUI, which is based on Swing's JPanelthat uses BorderLayout.In the north panel i have added a new JPanel which uses FlowLayout and contains two textField and other components. When I change the text of textField and invisible some componets inside this panel, this textField keeps resizing. How can I avoid this? I would like the textField to keep the same size whatever happens. I've tried setSize, setPreferredSize, setMinimumSize with no success.

txtSource = new WebTextField(source);
    txtSource.setMaximumSize(new Dimension(30,20));
    txtSource.setMinimumSize(new Dimension(20, 20));
    txtSource.setEditable(false);
    txtDestination = new WebTextField(destination);
    txtDestination.setMaximumSize(new Dimension(30,20));
    txtDestination.setMinimumSize(new Dimension(20, 20));

before:

after:

Answer 1

When I change the text of textField and invisible some componets inside this panel, this textField keeps resizing.

This example shows text fields at a constant size. Can you add an SSCCE of code that does not?

import java.awt.*;
import javax.swing.*;

class TextFieldSize {

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                JTextField smallField = new JTextField(5);
                JTextField largeField = new JTextField(20);
                JPanel gui = new JPanel(new FlowLayout());
                gui.add( smallField );
                gui.add( largeField );
                JFrame f = new JFrame("Text Field Size");
                f.add(gui);
                f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
                f.pack();
                f.setLocationByPlatform(true);
                f.setVisible(true);
            }
        });
    }
}

Answer 2

//This works best for me:

import java.awt.Dimension;

import javax.swing.BoxLayout;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;

public class NoResizeJTextField {
    public static void main(String[] args) {
        final JFrame frame = new JFrame();  
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);  
        frame.setPreferredSize(new Dimension(500,300));  
        JPanel panel = new JPanel();  
        panel.setLayout(new BoxLayout(panel, BoxLayout.X_AXIS));
        panel.add(new JLabel("Text: "));
        JTextField tf = new JTextField(30);
        tf.setMaximumSize(tf.getPreferredSize());
        tf.setMinimumSize(tf.getPreferredSize());
        panel.add(tf);
        frame.add(panel);   
        SwingUtilities.invokeLater(new Runnable() {             
            public void run() {  
                frame.pack();  
                frame.setVisible(true);  
            }  
        });  
    }
}

Answer 3

您无法按照自己的意愿执行此操作，有些LayoutManagers会忽略setXxxSize ，但是您可以使用接受setXxxSize fe BoxLayout