java - How to prevent enlarging JFormattedTextField for BoxLayout? -

i have jformattedtextfield components in 1 column. don´t understand why code causes enlarge maximum size.

    // create text fields , set them up.     priemerkolesa = new jformattedtextfield(numberformat);     priemerosi = new jformattedtextfield(numberformat);     hrubkaplasta = new jformattedtextfield(numberformat);     hrubkakolesa = new jformattedtextfield(numberformat);     hrubkanavinu = new jformattedtextfield(numberformat);     hrubkanavinu.setcolumns(6);     // layout text fields in panel.     jpanel fieldpane = new jpanel();     fieldpane.setlayout(new boxlayout(fieldpane, boxlayout.y_axis));     fieldpane.add(priemerkolesa);     fieldpane.add(priemerosi);     fieldpane.add(hrubkaplasta);     fieldpane.add(hrubkakolesa);     fieldpane.add(hrubkanavinu); 

i want have in nice stack, not expanded this.

it seems boxlayout stretches components fit available space. 1 way around first put each component jpanel flowlayout (which not stretch components within) add panel container using boxlayout. e.g. in form of mcve mentioned above:

import java.awt.*; import java.text.*; import javax.swing.*; import javax.swing.border.emptyborder;  public class boxlayoutquandary {      private jcomponent ui = null;      boxlayoutquandary() {         initui();     }      public void initui() {         if (ui != null) {             return;         }          ui = new jpanel(new borderlayout(4, 4));         ui.setborder(new emptyborder(4, 4, 4, 4));          numberformat numberformat = new decimalformat("##.#");         // create text fields , set them up.         jformattedtextfield priemerkolesa = new jformattedtextfield(numberformat);         priemerkolesa.setcolumns(8);         jformattedtextfield hrubkanavinu = new jformattedtextfield(numberformat);         hrubkanavinu.setcolumns(6);         // layout text fields in panel.         jpanel fieldpane = new jpanel();         fieldpane.setlayout(new boxlayout(fieldpane, boxlayout.y_axis));         ui.add(fieldpane);         jpanel priemerkolesapanel = new jpanel();         priemerkolesapanel.add(priemerkolesa);         fieldpane.add(priemerkolesapanel);         jpanel hrubkanavinupanel = new jpanel();         hrubkanavinupanel.add(hrubkanavinu);         fieldpane.add(hrubkanavinupanel);     }      public jcomponent getui() {         return ui;     }      public static void main(string[] args) {         runnable r = new runnable() {             @override             public void run() {                 try {                     uimanager.setlookandfeel(uimanager.getsystemlookandfeelclassname());                 } catch (exception usedefault) {                 }                 boxlayoutquandary o = new boxlayoutquandary();                  jframe f = new jframe(o.getclass().getsimplename());                 f.setdefaultcloseoperation(jframe.dispose_on_close);                 f.setlocationbyplatform(true);                  f.setcontentpane(o.getui());                 f.pack();                 f.setminimumsize(f.getsize());                  f.setvisible(true);             }         };         swingutilities.invokelater(r);     } }