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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.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.BorderFactory;
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JComboBox;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
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.RenderContext;
import edu.uci.ics.jung.visualization.VisualizationModel;
import edu.uci.ics.jung.visualization.VisualizationViewer;
import edu.uci.ics.jung.visualization.VisualizationServer.Paintable;
import edu.uci.ics.jung.visualization.annotations.AnnotatingGraphMousePlugin;
import edu.uci.ics.jung.visualization.annotations.AnnotatingModalGraphMouse;
import edu.uci.ics.jung.visualization.annotations.AnnotationControls;
import edu.uci.ics.jung.visualization.control.CrossoverScalingControl;
import edu.uci.ics.jung.visualization.control.ModalGraphMouse;
import edu.uci.ics.jung.visualization.control.ModalGraphMouse.Mode;
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.renderers.Renderer;

/**
 * Demonstrates annotation of graph elements.
 * 
 * @author Tom Nelson
 * 
 */
@SuppressWarnings("serial")
public class AnnotationsDemo extends JApplet {

    static final String instructions = 
        ""+
        "Instructions for Annotations"+
        "The Annotation Controls allow you to select:"+
        "
"+
        "Shape"+
        "
Color"+
        "
Fill (or outline)"+
        "
Above or below (UPPER/LOWER) the graph display"+
        ""+
        "Mouse Button one press starts a Shape,"+
        "
drag and release to complete."+
        "
Mouse Button three pops up an input dialog"+
        "
for text. This will create a text annotation."+
        "
You may use html for multi-line, etc."+
        "
You may even use an image tag and image url"+
        "
to put an image in the annotation."+
        "
"+
        "
To remove an annotation, shift-click on it"+
        "
in the Annotations mode."+
        "
If there is overlap, the Annotation with center"+
        "closest to the mouse point will be removed.";
    
    JDialog helpDialog;
    
    Paintable viewGrid;
    
    /**
     * create an instance of a simple graph in two views with controls to
     * demo the features.
     * 
     */
    public AnnotationsDemo() {
        
        // create a simple graph for the demo
        Graph graph = TestGraphs.getOneComponentGraph();
        
        // the preferred sizes for the two views
        Dimension preferredSize1 = new Dimension(600,600);
        
        // create one layout for the graph
        FRLayout layout = new FRLayout(graph);
        layout.setMaxIterations(500);
        
        VisualizationModel vm =
            new DefaultVisualizationModel(layout, preferredSize1);
        
        // create 2 views that share the same model
        final VisualizationViewer vv = 
            new VisualizationViewer(vm, preferredSize1);
        vv.setBackground(Color.white);
        vv.getRenderContext().setEdgeDrawPaintTransformer(new PickableEdgePaintTransformer(vv.getPickedEdgeState(), Color.black, Color.cyan));
        vv.getRenderContext().setVertexFillPaintTransformer(new PickableVertexPaintTransformer(vv.getPickedVertexState(), Color.red, Color.yellow));
        vv.getRenderContext().setVertexLabelTransformer(new ToStringLabeller());
        vv.getRenderer().getVertexLabelRenderer().setPosition(Renderer.VertexLabel.Position.CNTR);
        
        // add default listener for ToolTips
        vv.setVertexToolTipTransformer(new ToStringLabeller());
        
        Container content = getContentPane();
        Container panel = new JPanel(new BorderLayout());
        
        GraphZoomScrollPane gzsp = new GraphZoomScrollPane(vv);
        panel.add(gzsp);
        
        helpDialog = new JDialog();
        helpDialog.getContentPane().add(new JLabel(instructions));
        
        RenderContext rc = vv.getRenderContext();
        AnnotatingGraphMousePlugin annotatingPlugin =
        	new AnnotatingGraphMousePlugin(rc);
        // create a GraphMouse for the main view
        // 
        final AnnotatingModalGraphMouse graphMouse = 
        	new AnnotatingModalGraphMouse(rc, annotatingPlugin);
        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());
            }
        });
        
        JComboBox modeBox = graphMouse.getModeComboBox();
        modeBox.setSelectedItem(ModalGraphMouse.Mode.ANNOTATING);
        
        JButton help = new JButton("Help");
        help.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                helpDialog.pack();
                helpDialog.setVisible(true);
            }
        });

        JPanel controls = new JPanel();
        JPanel zoomControls = new JPanel();
        zoomControls.setBorder(BorderFactory.createTitledBorder("Zoom"));
        zoomControls.add(plus);
        zoomControls.add(minus);
        controls.add(zoomControls);
        
        JPanel modeControls = new JPanel();
        modeControls.setBorder(BorderFactory.createTitledBorder("Mouse Mode"));
        modeControls.add(graphMouse.getModeComboBox());
        controls.add(modeControls);
        
        JPanel annotationControlPanel = new JPanel();
        annotationControlPanel.setBorder(BorderFactory.createTitledBorder("Annotation Controls"));
        
        AnnotationControls annotationControls = 
            new AnnotationControls(annotatingPlugin);
        
        annotationControlPanel.add(annotationControls.getAnnotationsToolBar());
        controls.add(annotationControlPanel);
        
        JPanel helpControls = new JPanel();
        helpControls.setBorder(BorderFactory.createTitledBorder("Help"));
        helpControls.add(help);
        controls.add(helpControls);
        content.add(panel);
        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 AnnotationsDemo());
        f.pack();
        f.setVisible(true);
    }
}