Given： 10.interface Data { public void load（）； } 11.abs……

单项选择题Click the Exhibit button. What is the result？（）

A.Compilation of class A fails.
B.Line 28 prints the value 3 to System.out.
C.Line 28 prints the value 1 to System.out.
D.A runtime error occurs when line 25 executes.
E.Compilation fails because of an error on line 28.

单项选择题Given： Which statement is true about the class of an object that can reference the variable base？（）

A.It can be any class.
B.No class has access to base.
C.The class must belong to the geometry package.
D.The class must be a subclass of the class Hypotenuse.

单项选择题Given： What is the result？（）

A.Hello
B.Hello World
C.Compilation fails.
D.Hello World 5
E.The code runs with no output.

多项选择题Whichfourstatementsaretrue？（）

A.Has-a relationships should never be encapsulated.
B.Has-a relationships should be implemented using inheritance.
C.Has-a relationships can be implemented using instance variables.
D.Is-a relationships can be implemented using the extends keyword.
E.Is-a relationships can be implemented using the implements keyword.
F.An array or a collection can be used to implement a one-to-many has-a relationship.

多项选择题Given： Which four code fragments， inserted independently at line 7， will compile？（）

A.public void m1（） { }
B.protected void m1（） { }
C.private void m1（） { }
D.void m2（） { }
E.public void m2（） { }
F.protected void m2（） { }