Java – width of jcombobox

I've created one jCombo@R_231_2419 @, but it requires the full width of the frame How to set a fixed width

For the frame and box layout of the panel, it is borderlayout I add code here:

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

public class Window8  {

    JFrame frame;
    JPanel panel;
    JCombo@R_231_2419@ combo;
    public void go(){

    String[] option = { "STUDENT","TEACHER" };

    combo.setPreferredSize(new Dimension(1,25));
    combo = new JCombo@R_231_2419@(option);
    menu.setSelectedIndex(0);

    frame = new JFrame("DELETION"); 
    frame.setLocationRelativeTo(null);
    frame.setSize(400,300);
    frame.setDefaultCloSEOperation(JFrame.EXIT_ON_CLOSE);
    frame.setVisible(true);

    panel = new JPanel();
    panel.setLayout(new @R_231_2419@Layout(panel,@R_231_2419@Layout.Y_AXIS));

    frame.getContentPane().add(BorderLayout.NORTH,panel);
    panel.add(combo);   
}

Solution

The width is automatically determined by the width of the largest item added to the combo box You can control the display in the following ways:

combo@R_231_2419@.setPrototypeDisplayValue("text here");

You can also consider using combo box popup to control the pop-up window size

Edit:

Because you have added a display that you are using @ R_ 231_ 2419@Layout Code, you can try the following:

combo@R_231_2419@.setMaximumSize( combo@R_231_2419@.getPreferredSize() );

Or you can do this:

JPanel wrapper = new JPanel();
wrapper.add( combo@R_231_2419@ );
panel.add( wrapper );

Read the swing tutorial section of using layout managers to learn how these suggestions work