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Java example source code file (Euclidean2D.java)

This example Java source code file (Euclidean2D.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

euclidean1d, euclidean2d, instance, lazyholder, object, serializable, space

The Euclidean2D.java Java example source code

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.commons.math3.geometry.euclidean.twod;

import java.io.Serializable;

import org.apache.commons.math3.geometry.Space;
import org.apache.commons.math3.geometry.euclidean.oned.Euclidean1D;

 * This class implements a two-dimensional space.
 * @since 3.0
public class Euclidean2D implements Serializable, Space {

    /** Serializable version identifier. */
    private static final long serialVersionUID = 4793432849757649566L;

    /** Private constructor for the singleton.
    private Euclidean2D() {

    /** Get the unique instance.
     * @return the unique instance
    public static Euclidean2D getInstance() {
        return LazyHolder.INSTANCE;

    /** {@inheritDoc} */
    public int getDimension() {
        return 2;

    /** {@inheritDoc} */
    public Euclidean1D getSubSpace() {
        return Euclidean1D.getInstance();

    // CHECKSTYLE: stop HideUtilityClassConstructor
    /** Holder for the instance.
     * <p>We use here the Initialization On Demand Holder Idiom.

*/ private static class LazyHolder { /** Cached field instance. */ private static final Euclidean2D INSTANCE = new Euclidean2D(); } // CHECKSTYLE: resume HideUtilityClassConstructor /** Handle deserialization of the singleton. * @return the singleton instance */ private Object readResolve() { // return the singleton instance return LazyHolder.INSTANCE; } }

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