JComboBox change drop-down popup

Question

basically is popup for a JComboBox displayed below its derived JTextField, how can change direction from bellowed orientations for JComboBox\'s popup and display JComboBox\'

Answer 1

package com.example.swing;

import javax.swing.JList;
import javax.swing.ListCellRenderer;
import java.awt.Component;
import java.awt.Dimension;

public class PaddingListCellRenderer implements ListCellRenderer {
    private final ListCellRenderer original;
    private final int hpadding;
    private final int vpadding;

    public PaddingListCellRenderer(ListCellRenderer original, int hpadding, int vpadding) {
        this.original = original;
        this.hpadding = hpadding;
        this.vpadding = vpadding;
    }

    @Override
    @SuppressWarnings("unchecked")
    public Component getListCellRendererComponent(JList list, Type value, int index, boolean isSelected, boolean cellHasFocus) {
        final Component component = original.getListCellRendererComponent(list, value, index, isSelected, cellHasFocus);
        component.setPreferredSize(null);
        final Dimension pref = component.getPreferredSize();
        component.setPreferredSize(new Dimension(pref.width + 2 * hpadding, pref.height + 2 * vpadding));
        return component;
    }
}