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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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package com.vividsolutions.jtsexample.geom;

import com.vividsolutions.jts.geom.*;

/**
 * Examples of constructing Geometries programmatically.
 * 
 * The Best Practice moral here is:
 * 
 * Use the GeometryFactory to construct Geometries whenever possible.
 * 
 * This has several advantages:
 * 

 * Simplifies your code
 * 
allows you to take advantage of convenience methods provided by GeometryFactory
 * 
Insulates your code from changes in the signature of JTS constructors
 * 
 *
 * @version 1.7
 */
public class ConstructionExample
{

  public static void main(String[] args)
      throws Exception
  {
    // create a factory using default values (e.g. floating precision)
    GeometryFactory fact = new GeometryFactory();

    Point p1 = fact.createPoint(new Coordinate(0,0));
    System.out.println(p1);

    Point p2 = fact.createPoint(new Coordinate(1,1));
    System.out.println(p2);

    MultiPoint mpt = fact.createMultiPoint(new Coordinate[] { new Coordinate(0,0), new Coordinate(1,1) } );
    System.out.println(mpt);

  }
}