How to center items in a Java combobox

问题

Is there a method for a combobox in Java that will center the items in the combobox? I tried this but it didn't work:

myCombobox.setAlignmentY(CENTER_ALIGNMENT);

Thanks!

回答1:

Try this link: How to Use Combo Boxes (The Java™ Tutorials > Creating a GUI With JFC/Swing > Using Swing Components)

class ComboBoxRenderer extends JLabel
                   implements ListCellRenderer {
  public ComboBoxRenderer() {
    setOpaque(true);
    setHorizontalAlignment(CENTER);
    setVerticalAlignment(CENTER);
  }
  //. . .

or

((JLabel)comboBox.getRenderer()).setHorizontalAlignment(SwingConstants.CENTER);

回答2:

You have look at Renderers concept, described about in the JTable tutorial on Oracles pages, thic concept is similair for JComboBox, JList, JTable and JTree, in the Renderer you can centering desired text

来源：https://stackoverflow.com/questions/11008431/how-to-center-items-in-a-java-combobox