Discussion :: Objects and Collections
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which statement is true?class Test1 { public int value; public int hashCode() { return 42; } } class Test2 { public int value; public int hashcode() { return (int)(value^5); } }
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A.
class Test1 will not compile.
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B.
The Test1 hashCode() method is more efficient than the Test2 hashCode() method.
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C.
The Test1 hashCode() method is less efficient than the Test2 hashCode() method.
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D.
class Test2 will not compile.
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Answer : Option C
Explanation :
The so-called "hashing algorithm" implemented by class Test1 will always return the same value, 42, which is legal but which will place all of the hash table entries into a single bucket, the most inefficient setup possible.
Option A and D are incorrect because these classes are legal.
Option B is incorrect based on the logic described above.
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