多项选择题

Given:

What are four valid examples of polymorphic method calls?()

A.x.a2();
B.z.a2();
C.z.c1();
D.z.a1();
E.y.c1();
F.x.a1();

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单项选择题
Given: What is the result?()

A.peep
B.bark
C.meow
D.Compilation fails.
E.An exception is thrown at runtime.

单项选择题
Given: Which change can you make to Target without affecting Client?()

A.Line 4 of class Target can be changed to return i++;
B.Line 2 of class Target can be changed to private int i = 1;
C.Line 3 of class Target can be changed to private int addOne(){
D.Line 2 of class Target can be changed to private Integer i = 0;

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