单项选择题

A.Set set = new TreeSet();B.Set set = new HashSet();C.S……

Given:

Which code, inserted at line 4, guarantees that this program will output [1, 2]（）?

A.Set set = new TreeSet();
B.Set set = new HashSet();
C.Set set = new SortedSet();
D.List set = new SortedList();
E.Set set = new LinkedHashSet();

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多项选择题Given a class whose instances, when found in a collection of objects, are sorted by using the compareTo()method, which two statements are true?（）

A.The class implements java.lang.Comparable.
B.The class implements java.util.Comparator.
C.The interface used to implement sorting allows this class to define only one sort sequence.
D.The interface used to implement sorting allows this class to define many different sort sequences.

单项选择题Given: 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Given: What is the result?（）

A.7
B.49
C.343
D.Compilation fails.
E.An exception is thrown at runtime.

单项选择题Given: What is the result when the programmer attempts to compile the code and run it with the command java Converter 12?（）

A. It is true that j==i.
B. It is false that j==i.
C. An exception is thrown at runtime.
D. Compilation fails because of an error in line 13.

单项选择题Given: What is the result?（）

A.abc
B.123
C.a1b2c3
D.a1
E.Compilation fails.
F.The code runs with no output.
G.An exception is thrown at runtime