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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.Font;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.GridLayout;
import java.awt.Shape;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.InputEvent;
import java.awt.geom.Rectangle2D;

import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;

import com.google.common.base.Functions;

import edu.uci.ics.jung.algorithms.layout.FRLayout;
import edu.uci.ics.jung.algorithms.layout.GraphElementAccessor;
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.AnimatedPickingGraphMousePlugin;
import edu.uci.ics.jung.visualization.control.DefaultModalGraphMouse;
import edu.uci.ics.jung.visualization.control.LayoutScalingControl;
import edu.uci.ics.jung.visualization.control.PickingGraphMousePlugin;
import edu.uci.ics.jung.visualization.control.RotatingGraphMousePlugin;
import edu.uci.ics.jung.visualization.control.ScalingGraphMousePlugin;
import edu.uci.ics.jung.visualization.control.ShearingGraphMousePlugin;
import edu.uci.ics.jung.visualization.control.TranslatingGraphMousePlugin;
import edu.uci.ics.jung.visualization.control.ViewScalingControl;
import edu.uci.ics.jung.visualization.decorators.EdgeShape;
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.MultiPickedState;
import edu.uci.ics.jung.visualization.picking.PickedState;
import edu.uci.ics.jung.visualization.picking.ShapePickSupport;

/**
 * Demonstrates 3 views of one graph in one model with one layout.
 * Each view uses a different scaling graph mouse.
 * 
 * @author Tom Nelson 
 * 
 */
@SuppressWarnings("serial")
public class MultiViewDemo extends JApplet {

    /**
     * the graph
     */
    Graph graph;

    /**
     * the visual components and renderers for the graph
     */
    VisualizationViewer vv1;
    VisualizationViewer vv2;
    VisualizationViewer vv3;
    
    /**
     * the normal Function
     */
//    MutableTransformer Function;
    
    Dimension preferredSize = new Dimension(300,300);
    
    final String messageOne = "The mouse wheel will scale the model's layout when activated"+
    " in View 1. Since all three views share the same layout Function, all three views will"+
    " show the same scaling of the layout.";
    
    final String messageTwo = "The mouse wheel will scale the view when activated in"+
    " View 2. Since all three views share the same view Function, all three views will be affected.";
    
    final String messageThree = "   The mouse wheel uses a 'crossover' feature in View 3."+
    " When the combined layout and view scale is greater than '1', the model's layout will be scaled."+
    " Since all three views share the same layout Function, all three views will show the same "+
    " scaling of the layout.\n   When the combined scale is less than '1', the scaling function"+
    " crosses over to the view, and then, since all three views share the same view Function,"+
    " all three views will show the same scaling.";
    
    JTextArea textArea;
    JScrollPane scrollPane;
    
    /**
     * create an instance of a simple graph in two views with controls to
     * demo the zoom features.
     * 
     */
    public MultiViewDemo() {
        
        // create a simple graph for the demo
        graph = TestGraphs.getOneComponentGraph();
        
        // create one layout for the graph
        FRLayout layout = new FRLayout(graph);
        layout.setMaxIterations(1000);
        
        // create one model that all 3 views will share
        VisualizationModel visualizationModel =
            new DefaultVisualizationModel(layout, preferredSize);
 
        // create 3 views that share the same model
        vv1 = new VisualizationViewer(visualizationModel, preferredSize);
        vv2 = new VisualizationViewer(visualizationModel, preferredSize);
        vv3 = new VisualizationViewer(visualizationModel, preferredSize);
        
        vv1.getRenderContext().setEdgeShapeTransformer(EdgeShape.line(graph));
        vv2.getRenderContext().setVertexShapeTransformer(
        		Functions.constant(new Rectangle2D.Float(-6,-6,12,12)));

        vv2.getRenderContext().setEdgeShapeTransformer(EdgeShape.quadCurve(graph));
        
        vv3.getRenderContext().setEdgeShapeTransformer(EdgeShape.cubicCurve(graph));

//        Function = vv1.getLayoutTransformer();
//        vv2.setLayoutTransformer(Function);
//        vv3.setLayoutTransformer(Function);
//        
//        vv2.setViewTransformer(vv1.getViewTransformer());
//        vv3.setViewTransformer(vv1.getViewTransformer());
        
        vv2.getRenderContext().setMultiLayerTransformer(vv1.getRenderContext().getMultiLayerTransformer());
        vv3.getRenderContext().setMultiLayerTransformer(vv1.getRenderContext().getMultiLayerTransformer());

        vv1.getRenderContext().getMultiLayerTransformer().addChangeListener(vv1);
        vv2.getRenderContext().getMultiLayerTransformer().addChangeListener(vv2);
        vv3.getRenderContext().getMultiLayerTransformer().addChangeListener(vv3);

        
        vv1.setBackground(Color.white);
        vv2.setBackground(Color.white);
        vv3.setBackground(Color.white);
        
        // create one pick support for all 3 views to share
        GraphElementAccessor pickSupport = new ShapePickSupport(vv1);
        vv1.setPickSupport(pickSupport);
        vv2.setPickSupport(pickSupport);
        vv3.setPickSupport(pickSupport);

        // create one picked state for all 3 views to share
        PickedState pes = new MultiPickedState();
        PickedState pvs = new MultiPickedState();
        vv1.setPickedVertexState(pvs);
        vv2.setPickedVertexState(pvs);
        vv3.setPickedVertexState(pvs);
        vv1.setPickedEdgeState(pes);
        vv2.setPickedEdgeState(pes);
        vv3.setPickedEdgeState(pes);
        
        // set an edge paint function that shows picked edges
        vv1.getRenderContext().setEdgeDrawPaintTransformer(new PickableEdgePaintTransformer(pes, Color.black, Color.red));
        vv2.getRenderContext().setEdgeDrawPaintTransformer(new PickableEdgePaintTransformer(pes, Color.black, Color.red));
        vv3.getRenderContext().setEdgeDrawPaintTransformer(new PickableEdgePaintTransformer(pes, Color.black, Color.red));
        vv1.getRenderContext().setVertexFillPaintTransformer(new PickableVertexPaintTransformer(pvs, Color.red, Color.yellow));
        vv2.getRenderContext().setVertexFillPaintTransformer(new PickableVertexPaintTransformer(pvs, Color.blue, Color.cyan));
        vv3.getRenderContext().setVertexFillPaintTransformer(new PickableVertexPaintTransformer(pvs, Color.red, Color.yellow));
        
        // add default listener for ToolTips
        vv1.setVertexToolTipTransformer(new ToStringLabeller());
        vv2.setVertexToolTipTransformer(new ToStringLabeller());
        vv3.setVertexToolTipTransformer(new ToStringLabeller());
        
        Container content = getContentPane();
        JPanel panel = new JPanel(new GridLayout(1,0));
        
        final JPanel p1 = new JPanel(new BorderLayout());
        final JPanel p2 = new JPanel(new BorderLayout());
        final JPanel p3 = new JPanel(new BorderLayout());
        
        p1.add(new GraphZoomScrollPane(vv1));
        p2.add(new GraphZoomScrollPane(vv2));
        p3.add(new GraphZoomScrollPane(vv3));
        
        JButton h1 = new JButton("?");
        h1.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                textArea.setText(messageOne);
                JOptionPane.showMessageDialog(p1, scrollPane, 
                        "View 1", JOptionPane.PLAIN_MESSAGE);
            }});
        JButton h2 = new JButton("?");
        h2.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                textArea.setText(messageTwo);
                JOptionPane.showMessageDialog(p2, scrollPane, 
                        "View 2", JOptionPane.PLAIN_MESSAGE);
            }});
        JButton h3 = new JButton("?");
        h3.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent e) {
                textArea.setText(messageThree);
                textArea.setCaretPosition(0);
                JOptionPane.showMessageDialog(p3, scrollPane, 
                        "View 3", JOptionPane.PLAIN_MESSAGE);
           }});
        
        // create a GraphMouse for each view
        // each one has a different scaling plugin
        DefaultModalGraphMouse gm1 = new DefaultModalGraphMouse() {
            protected void loadPlugins() {
                pickingPlugin = new PickingGraphMousePlugin();
                animatedPickingPlugin = new AnimatedPickingGraphMousePlugin();
                translatingPlugin = new TranslatingGraphMousePlugin(InputEvent.BUTTON1_MASK);
                scalingPlugin = new ScalingGraphMousePlugin(new LayoutScalingControl(), 0);
                rotatingPlugin = new RotatingGraphMousePlugin();
                shearingPlugin = new ShearingGraphMousePlugin();

                add(scalingPlugin);
                setMode(Mode.TRANSFORMING);
            }
        };

        DefaultModalGraphMouse gm2 = new DefaultModalGraphMouse() {
            protected void loadPlugins() {
                pickingPlugin = new PickingGraphMousePlugin();
                animatedPickingPlugin = new AnimatedPickingGraphMousePlugin();
                translatingPlugin = new TranslatingGraphMousePlugin(InputEvent.BUTTON1_MASK);
                scalingPlugin = new ScalingGraphMousePlugin(new ViewScalingControl(), 0);
                rotatingPlugin = new RotatingGraphMousePlugin();
                shearingPlugin = new ShearingGraphMousePlugin();

                add(scalingPlugin);
                setMode(Mode.TRANSFORMING);
            }
       	
        };

        DefaultModalGraphMouse gm3 = new DefaultModalGraphMouse() {};
        
        vv1.setGraphMouse(gm1);
        vv2.setGraphMouse(gm2);
        vv3.setGraphMouse(gm3);

        vv1.setToolTipText("MouseWheel Scales Layout");
        vv2.setToolTipText("MouseWheel Scales View");
        vv3.setToolTipText("MouseWheel Scales Layout andcrosses over to view
ctrl+MouseWheel scales view");
 
        vv1.addPostRenderPaintable(new BannerLabel(vv1, "View 1"));
        vv2.addPostRenderPaintable(new BannerLabel(vv2, "View 2"));
        vv3.addPostRenderPaintable(new BannerLabel(vv3, "View 3"));
        
        textArea = new JTextArea(6,30);
        scrollPane = new JScrollPane(textArea, 
                JScrollPane.VERTICAL_SCROLLBAR_AS_NEEDED, JScrollPane.HORIZONTAL_SCROLLBAR_NEVER);
        textArea.setLineWrap(true);
        textArea.setWrapStyleWord(true);
        textArea.setEditable(false);
        
        JPanel flow = new JPanel();
        flow.add(h1);
        flow.add(gm1.getModeComboBox());
        p1.add(flow, BorderLayout.SOUTH);
        flow = new JPanel();
        flow.add(h2);
        flow.add(gm2.getModeComboBox());
        p2.add(flow, BorderLayout.SOUTH);
        flow = new JPanel();
        flow.add(h3);
        flow.add(gm3.getModeComboBox());
        p3.add(flow, BorderLayout.SOUTH);
        
        panel.add(p1);
        panel.add(p2);
        panel.add(p3);
        content.add(panel);
        

    }
    
    class BannerLabel implements VisualizationViewer.Paintable {
        int x;
        int y;
        Font font;
        FontMetrics metrics;
        int swidth;
        int sheight;
        String str;
        VisualizationViewer vv;
        
        public BannerLabel(VisualizationViewer vv, String label) {
            this.vv = vv;
            this.str = label;
        }
        
        public void paint(Graphics g) {
            Dimension d = vv.getSize();
            if(font == null) {
                font = new Font(g.getFont().getName(), Font.BOLD, 30);
                metrics = g.getFontMetrics(font);
                swidth = metrics.stringWidth(str);
                sheight = metrics.getMaxAscent()+metrics.getMaxDescent();
                x = (3*d.width/2-swidth)/2;
                y = d.height-sheight;
            }
            g.setFont(font);
            Color oldColor = g.getColor();
            g.setColor(Color.gray);
            g.drawString(str, x, y);
            g.setColor(oldColor);
        }
        public boolean useTransform() {
            return false;
        }
    }

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