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Exam AND-401 topic 1 question 100 discussion

Actual exam question from AndroidATC's AND-401
Question #: 100
Topic #: 1
[All AND-401 Questions]

Consider the following code snippet to query SQLite database:
String[] result_columns = new String[] {KEY_ID, COL1, COL2};
Cursor allRows = myDatabase.query(true, DATABASE_TABLE, result_columns, null, null, null, null, null, null);
Which of the following prints out the values of COL1 column correctly if the result is not empty?

  • A. if (allRows.moveToFirst()) { do { System.out.println(allRows.getString(1)); } while (allRows.moveToNext()); }
  • B. do { System.out.println(allRows.getString(0)); } while (allRows.moveToNext());
  • C. if (allRows.moveToFirst()) { do { System.out.println(allRows.getString(0)); } while (allRows.moveToNext()); }
  • D. if (allRows!= null) { do { System.out.println(allRows.getString(1)); }
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Suggested Answer: A 🗳️
by Mmadi at Dec. 31, 2022, 8:37 p.m.

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Mmadi
1 year, 12 months ago
A. if (allRows.moveToFirst()) { do { System.out.println(allRows.getString(1)); } while (allRows.moveToNext()); }
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