多项选择题X 纠错
A.public int hashCode()
B.public void hashCode()
C.public int compareTo(Object o)
D.public boolean equals(Object o)
E.public boolean compareTo(Key k)
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单项选择题
A.return super.hashCode();
B.return name.hashCode() + age * 7;
C.return name.hashCode() + comment.hashCode() / 2;
D.return name.hashCode() + comment.hashCode() / 2- age * 3;
单项选择题
A.The set variable contains all six elements from the coll collection, and the order is guaranteed to be preserved.
B.The set variable contains only three elements from the coll collection, and the order is guaranteed to be preserved.
C.The set variable contains all six elements from the coll collection, but the order is NOT guaranteed to be preserved.
D.The set variable contains only three elements from the coll collection, but the order is NOT guaranteed to be preserved.
单项选择题
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();
单项选择题
A.A
B.B
C.C
D.D
单项选择题
A.Tea
B.Coffee
C.Coffee Tea
D.Compilation fails.
E.The code runs with no output.
F.An exception is thrown at runtime.
单项选择题
A.Compilation fails.
B.An exception is thrown at runtime.
C.[608, 610, 612, 629] [608, 610]
D.[608, 610, 612, 629] [608, 610, 629]
E.[606, 608, 610, 612, 629] [608, 610]
F.[606, 608, 610, 612, 629] [608, 610, 629]
单项选择题
A.The time to find the value from HashMap with a Person key depends on the size of the map.
B.Deleting a Person key from a HashMap will delete all map entries for all keys of type Person.
C.Inserting a second Person object into a HashSet will cause the first Person object to be removed as a duplicate.
D.The time to determine whether a Person object is contained in a HashSet is constant and does NOT depend on the size of the map.
单项选择题
A.[1, 2, 3, 5]
B.[2, 1, 3, 5]
C.[2, 5, 3, 1]
D.[5, 3, 2, 1]
E.[1, 3, 5, 2]
F.Compilation fails.
G.An exception is thrown at runtime.
单项选择题
A.Compilation fails because the hashCode method is not overridden.
B.A HashSet could contain multiple Person objects with the same name.
C.All Person objects will have the same hash code because the hashCode method is not overridden.
D.If a HashSet contains more than one Person object with name="Fred", then removing another Person, also with name="Fred", will remove them all.
单项选择题
A.The code runs with no output.
B.An exception is thrown at runtime.
C.Compilation fails because of an error in line 20.
D.Compilation fails because of an error in line 21.
E.Compilation fails because of an error in line 23.
F.Compilation fails because of an error in line 25.