单项选择题

Given:

Which code, inserted at line 14, allows the Sprite class to compile?（）

A.Direction d = NORTH;
B.Nav.Direction d = NORTH;
C.Direction d = Direction.NORTH;
D.Nav.Direction d = Nav.Direction.NORTH;

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单项选择题
Given: Which code, inserted at line 15, creates an instance of the Point class defined in Line?（）

A.Point p = new Point();
B.Line.Point p = new Line.Point();
C.The Point class cannot be instatiated at line 15.
D.Line l = new Line() ; l.Point p = new l.Point();
单项选择题
Given: Which statement is true?（）

A.The code will compile without changes.
B.The code will compile if public Tree() { Plant(); } is added to the Tree class.
C.The code will compile if public Plant() { Tree(); } is added to the Plant class.
D.The code will compile if public Plant() { this("fern"); } is added to the Plant class.
E.The code will compile if public Plant() { Plant("fern"); } is added to the Plant class.
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