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单项选择题

Given：

Which statement is true？（）

A.The equals method does NOT properly override the Object.equals method.
B.Compilation fails because the private attribute p.name cannot be accessed in line 5.
C.To work correctly with hash-based data structures,this class must also implement the hashCode method.
D.When adding Person objects to a java.util.Set collection,the equals method in line 4 will prevent duplicates.


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热门试题

单项选择题Given： What is the result？（）

A.The value "4" is printed at the command line.
B.Compilation fails because of an error in line 5.
C.Compilation fails because of an error in line 9.
D.A NullPointerException occurs at runtime.
E.A NumberFormatException occurs at runtime.
F.An IllegalStateException occurs at runtime.

单项选择题Given： What is the result？（）

A.Compilation fails.
B.pi is bigger than 3.
C.An exception occurs at runtime.
D.pi is bigger than 3. Have a nice day.
E.pi is not bigger than 3. Have a nice day.

单项选择题Click the Exhibit button. Given： Which statement is true if a TestException is thrown on line 3 of class B？（）

A.Line 33 must be called within a try block.
B.The exception thrown by method 1 in class A is not required to be caught.
C.The method declared on line 31 must be declared to throw a runtime exception.
D.On line 5 of class A,the call to method 2 of class B does not need to be placed in a try catch block.

单项选择题Given： If class Donkey is invoked twice， the first time without assertions enabled，and the second time with assertions enabled， what are the results？（）

A.no output
B.no outputassert is on
C.assert is on
D.no outputAn AssertionError is thrown.
E.assert is onAn AssertionError is thrown.

单项选择题Given： What is the result？（）

A.5，6
B.5，5
C.6，5
D.6，6