import javax.swing.*;
import java.awt.BorderLayout;
import java.awt.Container;

public class JTreeLineExample{

	public static void main(String args[]) {
		JFrame fm = new JFrame("JTree Line frame");
		fm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		Container ca = fm.getContentPane();
		Box box = Box.createHorizontalBox();
		JTree tree1 = new JTree();
		JScrollPane scroll1 = new JScrollPane(tree1);
		JTree tree2 = new JTree();
		JScrollPane scroll2 = new JScrollPane(tree2);
		box.add(scroll1, BorderLayout.WEST);
		box.add(scroll2, BorderLayout.EAST);
		fm.getContentPane().add(box, BorderLayout.CENTER);
		fm.setSize(300, 250);
		fm.setVisible(true);
	}
}