Dive into the 'Java Toughest Exam: Trivia Quiz!' to challenge your understanding of Java programming. This quiz tests key concepts such as method overriding, exception handling, and object-oriented programming principles, essential for advanced Java programmers.
5,6
5,5
6,5
6,6
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A NullPointerException occurs at runtime.
Compilation fails because of an error in line 9.
Compilation fails because of an error in line 5.
The value "4" is printed at the command line.
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81
82
91
92
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DoStuff x = 5 main x = 5
DoStuff x = 6 main x = 6
Compilation fails
An exception is thrown at runtime
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18. d = df.parse(ds);
18. d = df.getDate(ds);
18. try { 19. d = df.parse(ds); 20. } catch(ParseException e) { };
18. try { 19. d = df.getDate(ds); 20. } catch(ParseException e) { };
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A
B
C
Ac
Abc
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The equals method does NOT properly override the Object.equals method.
Compilation fails because the private attribute p.name cannot be accessed in line 5.
To work correctly with hash-based data structures, this class must also implement the hashCode method.
When adding Person objects to a java.util.Set collection, the equals method in line 4 will prevent duplicates.
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Pi is not bigger than 3. Have a nice day.
Pi is bigger than 3. Have a nice day.
An exception occurs at runtime.
Pi is bigger than 3.
Compilation fails.
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Test end
Compilation fails
Test runtime end
Test exception end
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The equals method does NOT properly override the Object.equals method.
Compilation fails because the private attribute p.name cannot be accessed in line 5.
To work correctly with hash-based data structures, this class must also implement the hashCode method.
When adding Person objects to a java.util.Set collection, the equals method in line 4 will prevent duplicates.
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3
1 2
2 3
1 2 3
Compilation fails.
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Alpha a = x;
Foo f = (Delta)x;
Foo f = (Alpha)x;
Beta b = (Beta)(Alpha)x;
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The value "4" is printed at the command line.
Compilation fails because of an error in line 5.
Compilation fails because of an error in line 9.
A NullPointerException occurs at runtime.
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The instance gets garbage collected.
The code on line 33 throws an exception.
The code on line 35 throws an exception.
The code on line 31 throws an exception.
The code on line 33 executes successfully.
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The hashCode method for a given class can be used to test for object equality and object inequality for that class.
The hashCode method for a given class can be used to test for object inequality, but NOT object equality, for that class.
The hashCode method is used by the java.util.SortedSet collection class to order the elements within that set.
The hashCode method is used by the java.util.HashSet collection class to group the elements within that set into hash buckets for swift retrieval.
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00
0001
000120
00012021
Compilation fails.
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P0 = p1;
P1 = p2;
P2 = p4;
P2 = (ClassC)p1;
P1 = (ClassB)p3;
P2 = (ClassC)p4;
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B 3
B 8
B 13
F 3
F 8
F 13
Compilation fails
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0
1
2
3
4
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