java - Vertical alignment of checkboxes -

could me understand how set left vertical alignment checkboxes. mean each checkbox on own row.

tried imagine , have come end of wit.

public class displayframe extends jframe {     public displayframe(arraylist<string> contents){         displaypanel panel = new displaypanel(contents, whitelist);         add(panel);     }  private void displayall(){         displayframe frame = new displayframe(contents, whitelist);         gridbaglayout gbl = new gridbaglayout();         frame.setlayout(gbl);         frame.setvisible(true); ...     }  public class displaypanel extends jpanel {     arraylist<jcheckbox> cbarraylist = new arraylist<jcheckbox>();     arraylist<string> contents;  ...     public displaypanel(arraylist<string> contents){ ...         createlistofcheckboxes();     }       private void createlistofcheckboxes() {         gridbagconstraints gbc = new gridbagconstraints();         gbc.gridwidth = contents.size() + 1;         gbc.gridheight = contents.size() + 1;         (int = 0; < contents.size(); i++){             gbc.gridx = 0;             gbc.gridy = i;             string configuration = contents.get(i);             jcheckbox currentcheckbox = new jcheckbox(configuration);             if (whitelist.contains(configuration)){                 currentcheckbox.setselected(true);             }             currentcheckbox.setvisible(true);             add(currentcheckbox, gbc);         }     } 

"if able proceed without gridbaglayout, suit me"

you can use boxlayout. box convenience class boxlayout. can do

box box = box.createverticalbox(); (int = 0; < contents.size(); i++){     string configuration = contents.get(i);     jcheckbox currentcheckbox = new jcheckbox(configuration);     if (whitelist.contains(configuration)){         currentcheckbox.setselected(true);     }     box.add(currentcheckbox); } 

since box jcomponent, can add box container.

you can see more @ how use boxlayout

simple example

import javax.swing.*;  public class boxdemo {      public static void main(string[] args) {         box box = box.createverticalbox();         jcheckbox cbox1 = new jcheckbox("check me once");         jcheckbox cbox2 = new jcheckbox("check me twice");         jcheckbox cbox3 = new jcheckbox("check me thrice");         box.add(cbox1);         box.add(cbox2);         box.add(cbox3);         joptionpane.showmessagedialog(null, box);     } }