graphstreamHierarchicalLayoutTesting.java

import org.graphstream.graph.Graph;
import org.graphstream.graph.Node;
import org.graphstream.graph.implementations.SingleGraph;
import org.graphstream.ui.layout.HierarchicalLayout;
import org.graphstream.ui.view.Viewer;

public class graphstreamHierarchicalLayoutTesting {
	
	public static void main(String[] args) {
		Graph graph = new SingleGraph("Test");
		
		Viewer viewer = graph.display(false);
		HierarchicalLayout hl = new HierarchicalLayout();
		viewer.enableAutoLayout(hl);
		
		graph.addNode("A");
		graph.getNode("A").addAttribute("ui.label", "A");
		graph.addNode("B");
		graph.getNode("B").addAttribute("ui.label", "B");
		graph.addNode("C");
		graph.getNode("C").addAttribute("ui.label", "C");
		graph.addNode("D");
		graph.getNode("D").addAttribute("ui.label", "D");
		graph.addNode("E");
		graph.getNode("E").addAttribute("ui.label", "E");
		graph.addNode("F");
		graph.getNode("F").addAttribute("ui.label", "F");
		graph.addNode("G");
		graph.getNode("G").addAttribute("ui.label", "G");
		graph.addNode("H");
		graph.getNode("H").addAttribute("ui.label", "H");
		graph.addNode("I");
		graph.getNode("I").addAttribute("ui.label", "I");	
		
		graph.addEdge("AB", "A", "B");
		graph.addEdge("AC", "A", "C");
		graph.addEdge("AD", "A", "D");
		graph.addEdge("CE", "C", "E");
		graph.addEdge("CF", "C", "F");
		graph.addEdge("FG", "F", "G");
		graph.addEdge("FI", "F", "I");
		graph.addEdge("GH", "G", "H");

		//hl.compute();
	}
}

Result of the above:

Hierarchical Layout algorithm in yEd: