LucenePackage 包获取当前lucene包信息

package org.apache.lucene;

/**
* 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,
* 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.
*/

/** Lucene's package information, including version. **/
public final class LucenePackage {

  private LucenePackage() {}                      // can't construct

  /** Return Lucene's package, including version information. */
  public static Package get() {
    return LucenePackage.class.getPackage();
  }
}

它属于package org.apache.lucene包
可以看出LucenePackage类构造函数为空，返回的信息包括版本号什么的
返回LucenePackage.class.getPackage();
调用get方法