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The JTS Topology Suite is an API for modelling and manipulating 2-dimensional linear geometry. It provides numerous geometric predicates and functions. JTS conforms to the Simple Features Specification for SQL published by the Open GIS Consortium.

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/*
 * The JTS Topology Suite is a collection of Java classes that
 * implement the fundamental operations required to validate a given
 * geo-spatial data set to a known topological specification.
 *
 * Copyright (C) 2001 Vivid Solutions
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 * For more information, contact:
 *
 *     Vivid Solutions
 *     Suite #1A
 *     2328 Government Street
 *     Victoria BC  V8T 5G5
 *     Canada
 *
 *     (250)385-6040
 *     www.vividsolutions.com
 */
package com.vividsolutions.jtsexample.operation.linemerge;

import com.vividsolutions.jts.geom.Geometry;
import com.vividsolutions.jts.io.WKTReader;
import com.vividsolutions.jts.operation.linemerge.LineMerger;

import java.util.ArrayList;
import java.util.Collection;


/**
 * Example of using the LineMerger class to sew together a set of fully noded 
 * linestrings.
 *
 * @version 1.7
 */
public class LineMergeExample {
  private WKTReader reader = new WKTReader();

  public LineMergeExample() {
  }

  public static void main(String[] args) throws Exception {
    LineMergeExample test = new LineMergeExample();
    try {
      test.run();
    } catch (Exception ex) {
      ex.printStackTrace();
    }
  }

  void run() throws Exception {
    Collection lineStrings = getData();
    
    LineMerger lineMerger = new LineMerger();
    lineMerger.add(lineStrings);
    Collection mergedLineStrings = lineMerger.getMergedLineStrings();
    
    System.out.println("Lines formed (" + mergedLineStrings.size() + "):");
    System.out.println(mergedLineStrings);
  }

  Collection getData() {
    Collection lines = new ArrayList();
    lines.add(read("LINESTRING (220 160, 240 150, 270 150, 290 170)"));
    lines.add(read("LINESTRING (60 210, 30 190, 30 160)"));
    lines.add(read("LINESTRING (70 430, 100 430, 120 420, 140 400)"));
    lines.add(read("LINESTRING (160 310, 160 280, 160 250, 170 230)"));
    lines.add(read("LINESTRING (170 230, 180 210, 200 180, 220 160)"));
    lines.add(read("LINESTRING (30 160, 40 150, 70 150)"));
    lines.add(read("LINESTRING (160 310, 200 330, 220 340, 240 360)"));
    lines.add(read("LINESTRING (140 400, 150 370, 160 340, 160 310)"));
    lines.add(read("LINESTRING (160 310, 130 300, 100 290, 70 270)"));
    lines.add(read("LINESTRING (240 360, 260 390, 260 410, 250 430)"));
    lines.add(read("LINESTRING (70 150, 100 180, 100 200)"));
    lines.add(read("LINESTRING (70 270, 60 260, 50 240, 50 220, 60 210)"));
    lines.add(read("LINESTRING (100 200, 90 210, 60 210)"));

    return lines;
  }

  Geometry read(String lineWKT) {
    try {
      Geometry geom = reader.read(lineWKT);

      return geom;
    } catch (Exception ex) {
      ex.printStackTrace();
    }

    return null;
  }
}