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BJP5 Self-Check 17.3: binaryTreeProperties

Language/Type: Java binary trees
Author: Marty Stepp (on 2019/09/19)

The following questions refer to the following tree: 

          +---+
          | 3 |
          +---+
         /     \
     +---+     +---+
     | 5 |     | 2 |
     +---+     +---+
    /         /     \
+---+     +---+     +---+
| 1 |     | 4 |     | 6 |
+---+     +---+     +---+
How many levels does it have?
How many branches (non-leaves) does it have?
Which node values are stored in the branches? (Write them separated by commas, in ascending order by value.)
How many leaves does it have?
Which node values are stored in the leaves? (Write them separated by commas, in ascending order by value.)
What value is stored at the root of the tree?
Which node(s) are the sibling(s) of the node storing the value 2? (If there is more than one, write them separated by commas, in ascending order by value.)
Which node(s) are the children of the node storing the value 2? (Write them separated by commas, in ascending order by value.)

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