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public abstract class AbstractTree>
    implements Tree {
  @Override /** Inorder traversal from the root*/
  public void inorder（） {
  }

  @Override /** Postorder traversal from the root */
  public void postorder（） {
  }

  @Override /** Preorder traversal from the root */
  public void preorder（） {
  }

  @Override /** Return true if the tree is empty */
  public boolean isEmpty（） {
    return getSize（） == 0;
  }
//
//  @Override /** Return an iterator for the tree */
//  public java.util.Iterator iterator（） {
//    return null;
//  }
}

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----

     文件        379  2016-11-15 07:16  exercise.classpath

     文件        384  2016-04-17 09:25  exercise.project

     文件         53  2014-11-03 18:12  exercise.SearchTree

     文件        598  2016-04-17 09:25  exercise.settingsorg.eclipse.jdt.core.prefs

     文件        832  2017-03-12 12:44  exerciseAbstractTree.class

     文件        601  2012-03-05 15:13  exerciseAbstractTree.java

     文件       1511  2017-03-12 12:44  exerciseAccount.class

     文件       2131  2017-03-12 12:44  exerciseAccount1.class

     文件        366  2015-10-08 14:56  exerciseaddress.dat

     文件     192965  2014-03-20 16:03  exerciseak.txt

     文件       2050  2011-10-11 22:01  exercisealarmSound.au

     文件     140761  2012-05-15 12:54  exerciseAllBabyNamesSortedAllowDuplicates.txt

     文件      17865  2012-05-15 12:53  exerciseAllBabyNamesSortedDuplicatesNotAllowed.txt

     文件       1136  2017-03-12 12:44  exerciseAnimal.class

     文件        364  2017-03-12 12:44  exerciseApple.class

     文件      12254  1999-02-26 15:03  exerciseaudioam.au

     文件       5598  1999-05-08 14:23  exerciseaudioanthem0.mid

     文件       7913  1999-05-08 14:21  exerciseaudioanthem1.mid

     文件       8342  1999-05-08 14:21  exerciseaudioanthem2.mid

     文件       3737  1999-05-08 14:31  exerciseaudioanthem3.mid

     文件       8332  1999-05-08 14:24  exerciseaudioanthem4.mid

     文件       5232  1999-05-08 14:22  exerciseaudioanthem5.mid

     文件      11000  1999-05-08 14:15  exerciseaudioanthem6.mid

     文件       8342  1999-05-08 14:21  exerciseaudiochina.mid

     文件     482975  2013-03-25 21:54  exerciseaudiochina.mp3

     文件       5598  1999-05-08 14:23  exerciseaudiodenmark.mid

     文件     482975  2013-03-25 21:53  exerciseaudiodenmark.mp3

     文件       7913  1999-05-08 14:21  exerciseaudiogermany.mid

     文件     482975  2013-03-25 21:53  exerciseaudiogermany.mp3

     文件      12254  1999-02-26 15:10  exerciseaudiohour0.au

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