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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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.
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.
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.
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.
Given：
What is the result？（）
A.5，6
B.5，5
C.6，5
D.6，6
Given：
Under which three circumstances will the code on line 37 be executed？（）
A.The instance gets garbage collected.
B.The code on line 33 throws an exception.
C.The code on line 35 throws an exception.
D.The code on line 31 throws an exception.
E.The code on line 33 executes successfully.
Given：
If some sort of exception is thrown at line 34， which output is possible？（）
A.a
B.b
C.c
D.ac
E.abc
Given：
What is the result？（）
A.test end
B.Compilation fails.
C.test runtime end
D.test exception end
E.A Throwable is thrown by main at runtime.
Given：
What is the result when the go（） method is invoked？（）
A.00
B.0001
C.000120
D.00012021
E.Compilation fails
F.An exception is thrown at runtime
Given：
Which code， inserted at line 16， will cause a java.lang.ClassCastException？（）
A.Alpha a = x；
B.Foo f = （Delta）x；
C.Foo f = （Alpha）x；
D.Beta b = （Beta）（Alpha）x；
最新试题
Given：What is the result？（）
Given：What is the result？（）
A programmer has an algorithm that requires a java.util.List that provides an efficient implementation of add（0， object）， but does NOT need to support quick random access.What supports these requirements？（）
Given：What is the result？（）
Given：What is the appropriate definition of the hashCode method in class Person？（）
Given a class whose instances， when found in a collection of objects， are sorted by using the compare To method， which two statements are true？（）
Given：What is the result？（）
Given：What is the result？（）
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Given：Which two code fragments， inserted independently at line 5， will compile without warnings？（）