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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.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Image;
import java.awt.Paint;
import java.awt.geom.Point2D;

import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JLabel;

import com.google.common.base.Functions;

import edu.uci.ics.jung.algorithms.layout.KKLayout;
import edu.uci.ics.jung.graph.DirectedSparseMultigraph;
import edu.uci.ics.jung.graph.util.EdgeType;
import edu.uci.ics.jung.visualization.VisualizationImageServer;
import edu.uci.ics.jung.visualization.decorators.ToStringLabeller;
import edu.uci.ics.jung.visualization.renderers.GradientVertexRenderer;
import edu.uci.ics.jung.visualization.renderers.Renderer;
import edu.uci.ics.jung.visualization.renderers.BasicVertexLabelRenderer.InsidePositioner;


/**
 * Demonstrates VisualizationImageServer.
 * @author Tom Nelson
 * 
 */
public class VisualizationImageServerDemo {

    /**
     * the graph
     */
    DirectedSparseMultigraph graph;

    /**
     * the visual component and renderer for the graph
     */
    VisualizationImageServer vv;
    
    /**
     * 
     */
    public VisualizationImageServerDemo() {
        
        // create a simple graph for the demo
        graph = new DirectedSparseMultigraph();
        String[] v = createVertices(10);
        createEdges(v);

        vv =  new VisualizationImageServer(new KKLayout(graph), new Dimension(600,600));

        vv.getRenderer().setVertexRenderer(
        		new GradientVertexRenderer(
        				Color.white, Color.red, 
        				Color.white, Color.blue,
        				vv.getPickedVertexState(),
        				false));
        vv.getRenderContext().setEdgeDrawPaintTransformer(Functions.constant(Color.lightGray));
        vv.getRenderContext().setArrowFillPaintTransformer(Functions.constant(Color.lightGray));
        vv.getRenderContext().setArrowDrawPaintTransformer(Functions.constant(Color.lightGray));
        
        vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
        vv.getRenderer().getVertexLabelRenderer().setPositioner(new InsidePositioner());
        vv.getRenderer().getVertexLabelRenderer().setPosition(Renderer.VertexLabel.Position.AUTO);

        // create a frome to hold the graph
        final JFrame frame = new JFrame();
        Container content = frame.getContentPane();

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        Image im = vv.getImage(new Point2D.Double(300,300), new Dimension(600,600));
        Icon icon = new ImageIcon(im);
        JLabel label = new JLabel(icon);
        content.add(label);
        frame.pack();
        frame.setVisible(true);
    }
    
    /**
     * create some vertices
     * @param count how many to create
     * @return the Vertices in an array
     */
    private String[] createVertices(int count) {
        String[] v = new String[count];
        for (int i = 0; i < count; i++) {
        	v[i] = "V"+i;
            graph.addVertex(v[i]);
        }
        return v;
    }

    /**
     * create edges for this demo graph
     * @param v an array of Vertices to connect
     */
    void createEdges(String[] v) {
        graph.addEdge(new Double(Math.random()), v[0], v[1], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[0], v[3], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[0], v[4], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[4], v[5], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[3], v[5], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[1], v[2], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[1], v[4], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[8], v[2], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[3], v[8], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[6], v[7], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[7], v[5], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[0], v[9], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[9], v[8], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[7], v[6], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[6], v[5], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[4], v[2], EdgeType.DIRECTED);
        graph.addEdge(new Double(Math.random()), v[5], v[4], EdgeType.DIRECTED);
    }

    public static void main(String[] args) 
    {
        new VisualizationImageServerDemo();
        
    }
}