多项选择题

Which two， inserted at line 11， will allow the code to compile？（）

A.public class MinMax<？>{
B.public class MinMax<？ extends Number>{
C.public class MinMax<N extends Object>{
D.public class MinMax<N extends Number>{
E.public class MinMax<？ extends Object>{
F.public class MinMax<N extends Integer>{

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单项选择题

What is the result？（）

A.0
B.1
C.2
D.3
E.4
F.Compilation fails.
G.An exception is thrown at runtime.

单项选择题

What is the result？（）

A.Compilation fails due to an error in line 23.
B.Compilation fails due to an error in line 29.
C.A ClassCastException occurs in line 29.
D.A ClassCastException occurs in line 31.
E.The value of all four objects prints in natural order.

单项选择题

Which method will complete this class？（）

A.public int compareTo（Object o）{/* more code here */}
B.public int compareTo（Score other）{/* more code here */}
C.public int compare（Score s1， Score s2）{/* more code here */}
D.public int compare（Object o1， Object o2）{/* more code here */}