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Exam 1z0-808 topic 1 question 52 discussion

Actual exam question from Oracle's 1z0-808
Question #: 52
Topic #: 1
[All 1z0-808 Questions]

Given the code fragment:

What is the result?

  • A. Element 0 Element 1
  • B. Null element 0 Null element 1
  • C. Null Null
  • D. A NullPointerException is thrown at runtime.
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Suggested Answer: D 🗳️
by letmein2 at June 16, 2019, 11:49 p.m.

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Saftschnitzel
Highly Voted 4 years, 8 months ago
To add to the explanation: The JVM throws a null pointer exception because a method (concat()) is called on an object containing null. Note that the print() method does not cause JVM to throw an exception and prints null.
upvoted 23 times
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letmein2
Highly Voted 5 years, 5 months ago
correct. null pointer is thrown at the line strs[idx].concat("element" + idx); because strs[0] is null.
upvoted 6 times
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vic88
Most Recent 5 days, 16 hours ago
Selected Answer: D
D is right. During each iteration: First iteration (idx = 0): strs[0] is null. strs[idx].concat(" element " + idx) attempts to call concat on null, which leads to a NullPointerException.
upvoted 1 times
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Vicky_65
1 year, 8 months ago
Selected Answer: D
D is correct
upvoted 1 times
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odzio33
1 year, 11 months ago
Selected Answer: D
String[] strings = new String[2]; int idx = 0; for(String s : strings){ strings[idx].concat(" element " + idx); idx++; } for (idx = 0; idx < strings.length; idx++){ System.out.println(strings[idx]); } Exception in thread "main" java.lang.NullPointerException
upvoted 1 times
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akbiyik
2 years ago
NullPointerException is thrown at runtime.
upvoted 1 times
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tawa_z58
2 years ago
D is correct .NullPointerException is thrown at runtime .
upvoted 1 times
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v323rs
4 years, 11 months ago
Correct D. A NullPointerException is thrown at runtime.
upvoted 3 times
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