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Java 1.6+ Library with tons of utility classes required in all projects

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/**
 * Copyright (C) 2014-2016 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * Licensed 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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.helger.commons.system;

import javax.annotation.concurrent.Immutable;

import com.helger.commons.CGlobal;
import com.helger.commons.annotation.PresentForCodeCoverage;
import com.helger.commons.string.StringParser;

/**
 * Helper class that holds the current class version. Must be a separate class
 * to maintain the correct initialization order.
 *
 * @author Philip Helger
 */
@Immutable
final class JavaVersionConstants
{
  /** The global Java class version as a double value. */
  public static final double CLASS_VERSION = StringParser.parseDouble (SystemProperties.getJavaClassVersion (),
                                                                       CGlobal.ILLEGAL_DOUBLE);

  @PresentForCodeCoverage
  private static final JavaVersionConstants s_aInstance = new JavaVersionConstants ();

  private JavaVersionConstants ()
  {}
}