import java.awt.ComponentOrientation;
import java.awt.FlowLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;

public class MainFlowLayout extends JPanel {

    public MainFlowLayout() {
        super(new FlowLayout(FlowLayout.LEADING, 10, 3));
        this.setComponentOrientation(ComponentOrientation.RIGHT_TO_LEFT);
        add(new JButton("Hunden"));
        add(new JButton("Katten"));
        add(new JButton("Hesten"));
        add(new JButton("Giraffen"));
    }

    public static void main(String[] args) {
        JFrame frame = new JFrame();
        frame.add(new MainFlowLayout());

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(150, 200);
        frame.setVisible(true);
    }
}