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Sample programs using JUNG. Nearly all JUNG capabilities are demonstrated here. Please study the source code for these examples prior to asking how to do something.
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/*
 * Copyright (c) 2003, The JUNG Authors
 * All rights reserved.
 * 
 * This software is open-source under the BSD license; see either "license.txt"
 * or https://github.com/jrtom/jung/blob/master/LICENSE for a description.
 * 
 */
package edu.uci.ics.jung.samples;

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;

import javax.swing.BorderFactory;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.JPanel;

import edu.uci.ics.jung.algorithms.layout.FRLayout;
import edu.uci.ics.jung.graph.Graph;
import edu.uci.ics.jung.graph.util.TestGraphs;
import edu.uci.ics.jung.visualization.DefaultVisualizationModel;
import edu.uci.ics.jung.visualization.GraphZoomScrollPane;
import edu.uci.ics.jung.visualization.VisualizationModel;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.control.CrossoverScalingControl;
import edu.uci.ics.jung.visualization.control.DefaultModalGraphMouse;
import edu.uci.ics.jung.visualization.control.ScalingControl;
import edu.uci.ics.jung.visualization.decorators.PickableEdgePaintTransformer;
import edu.uci.ics.jung.visualization.decorators.PickableVertexPaintTransformer;
import edu.uci.ics.jung.visualization.decorators.ToStringLabeller;
import edu.uci.ics.jung.visualization.picking.PickedState;
import edu.uci.ics.jung.visualization.renderers.Renderer;
import edu.uci.ics.jung.visualization.renderers.Renderer.VertexLabel.Position;

/**
 * Demonstrates vertex label positioning 
 * controlled by the user.
 * In the AUTO setting, labels are placed according to
 * which quadrant the vertex is in
 * 
 * @author Tom Nelson
 * 
 */
@SuppressWarnings("serial")
public class VertexLabelPositionDemo extends JApplet {

    /**
     * the graph
     */
    Graph graph;
    
    FRLayout graphLayout;
    
    /**
     * the visual component and renderer for the graph
     */
    VisualizationViewer vv;
    
    ScalingControl scaler;
    
    /**
     * create an instance of a simple graph with controls to
     * demo the zoomand hyperbolic features.
     * 
     */
    public VertexLabelPositionDemo() {
        
        // create a simple graph for the demo
        graph = TestGraphs.getOneComponentGraph();
        
        graphLayout = new FRLayout(graph);
        graphLayout.setMaxIterations(1000);

        Dimension preferredSize = new Dimension(600,600);
        
        final VisualizationModel visualizationModel = 
            new DefaultVisualizationModel(graphLayout, preferredSize);
        vv =  new VisualizationViewer(visualizationModel, preferredSize);

        PickedState ps = vv.getPickedVertexState();
        PickedState pes = vv.getPickedEdgeState();
        vv.getRenderContext().setVertexFillPaintTransformer(new PickableVertexPaintTransformer(ps, Color.red, Color.yellow));
        vv.getRenderContext().setEdgeDrawPaintTransformer(new PickableEdgePaintTransformer(pes, Color.black, Color.cyan));
        vv.setBackground(Color.white);
        vv.getRenderer().getVertexLabelRenderer().setPosition(Renderer.VertexLabel.Position.W);
        
        vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
        
        // add a listener for ToolTips
        vv.setVertexToolTipTransformer(new ToStringLabeller());
        
        Container content = getContentPane();
        GraphZoomScrollPane gzsp = new GraphZoomScrollPane(vv);
        content.add(gzsp);
        
        /**
         * the regular graph mouse for the normal view
         */
        final DefaultModalGraphMouse graphMouse
        	= new DefaultModalGraphMouse();

        vv.setGraphMouse(graphMouse);
        vv.addKeyListener(graphMouse.getModeKeyListener());
        
        final ScalingControl scaler = new CrossoverScalingControl();

        JButton plus = new JButton("+");
        plus.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                scaler.scale(vv, 1.1f, vv.getCenter());
            }
        });
        JButton minus = new JButton("-");
        minus.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                scaler.scale(vv, 1/1.1f, vv.getCenter());
            }
        });
        JPanel positionPanel = new JPanel();
        positionPanel.setBorder(BorderFactory.createTitledBorder("Label Position"));
        JMenuBar menubar = new JMenuBar();
        menubar.add(graphMouse.getModeMenu());
        gzsp.setCorner(menubar);
        JComboBox cb = new JComboBox();
        cb.addItem(Renderer.VertexLabel.Position.N);
        cb.addItem(Renderer.VertexLabel.Position.NE);
        cb.addItem(Renderer.VertexLabel.Position.E);
        cb.addItem(Renderer.VertexLabel.Position.SE);
        cb.addItem(Renderer.VertexLabel.Position.S);
        cb.addItem(Renderer.VertexLabel.Position.SW);
        cb.addItem(Renderer.VertexLabel.Position.W);
        cb.addItem(Renderer.VertexLabel.Position.NW);
        cb.addItem(Renderer.VertexLabel.Position.N);
        cb.addItem(Renderer.VertexLabel.Position.CNTR);
        cb.addItem(Renderer.VertexLabel.Position.AUTO);
        cb.addItemListener(new ItemListener() {
			public void itemStateChanged(ItemEvent e) {
				Renderer.VertexLabel.Position position = 
					(Renderer.VertexLabel.Position)e.getItem();
				vv.getRenderer().getVertexLabelRenderer().setPosition(position);
				vv.repaint();
			}});
        cb.setSelectedItem(Renderer.VertexLabel.Position.SE);
        positionPanel.add(cb);
        JPanel controls = new JPanel();
        JPanel zoomControls = new JPanel(new GridLayout(2,1));
        zoomControls.setBorder(BorderFactory.createTitledBorder("Zoom"));
        zoomControls.add(plus);
        zoomControls.add(minus);
        
        controls.add(zoomControls);
        controls.add(positionPanel);
        content.add(controls, BorderLayout.SOUTH);
    }

    public static void main(String[] args) {
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(new VertexLabelPositionDemo());
        f.pack();
        f.setVisible(true);
    }
}