单项选择题

Given:

Which statement is true?（）

A.420 is the output.
B.An exception is thrown at runtime.
C.All constructors must be declared public.
D.Constructors CANNOT use the private modifier.
E.Constructors CANNOT use the protected modifier.

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单项选择题

A team of programmers is reviewing a proposed API for a new utility class. After some discussion,they realize that they can reduce the number of methods in the API without losing any functionality.If they implement the new design, which two OO principles will they be promoting?（）

A.Looser coupling
B.Tighter coupling
C.Lower cohesion
D.Higher cohesion
E.Weaker encapsulation
F.Stronger encapsulation

多项选择题

Given: Which two code fragments, inserted independently at line 13, will compile?（）

A.super(name, baseSalary);
B.this.commission = commission;
C.super();this.commission = commission;
D.this.commission = commission;super();
E. super(name, baseSalary);this.commission = commission;
F.this.commission = commission;super(name, baseSalary);
G.super(name, baseSalary, commission);

Given: Which statement is true?（）

Given:

Which statement is true?（）