How can I add a normal-sized button to my frame???

Question

hi,
my GUI has two JScrollPane-s together in a JSplitPane and below I'd like to add a single small button.
I put this button into a new JPanel, but it is displayed veeery BIG !
I tried to use .setPreferredSize(new Dimension(int, int)), but it didn't help a lot.
this is a piece of my code:
public class MyTree extends JPanel implements TreeSelectionListener, ActionListener {
          this.setLayout(new GridLayout(2,0));
         buttonUpdateM_File = new JButton("Update the .m file");
         buttonUpdateM_File.addActionListener(this);
         JPanel actionPane = new JPanel(new GridLayout(0,1));
         actionPane.setMaximumSize(new Dimension(1,2));
         actionPane.setPreferredSize(new Dimension(5,10));
         actionPane.add(buttonUpdateM_File);
          //create the scroll pane and put the tree into it
          JScrollPane treeView = new JScrollPane(tree);
          //create the viewing scroll pane
          JScrollPane maskViewPane = new JScrollPane();
          //add the two scroll panes to a split pane
          JSplitPane splitPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
          splitPane.setLeftComponent(treeView);
          splitPane.setRightComponent(maskViewPane);
          Dimension minimumSize = new Dimension(420, 360);
          treeView.setMinimumSize(minimumSize);
          maskViewPane.setMinimumSize(minimumSize);
          splitPane.setDividerLocation(210);
        splitPane.setPreferredSize(new Dimension(600, 510));
        //Add the split pane to this panel
        add(splitPane);
        add(actionPane);
     }Thank you!

Answer 1

thanks,
as far as I understood there is no way to shrink the
new JPanel with this GridLayout.Yes, Grid just makes a set of fixed sized boxes. If you want the JPanel to be the same size as the JButton, what do you want the panel for?