The default value for data field of a boolean type, numeric type, object type is ___________, respectively.
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true, 1, Null
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false, 0, null
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true, 0, null
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true, 1, null
In Java, boolean fields default to false, numeric types (int, double, etc.) default to 0, and object types default to null. This is consistent across all primitive and reference types. Options A, C, and D incorrectly use 'true' or '1' for boolean or numeric defaults.
To answer this question, let's go through each option to understand why it is correct or incorrect:
Option A) true, 1, Null - This option is incorrect because the default value for a boolean type is false, not true. Also, the default value for a numeric type is 0, not 1. Lastly, the default value for an object type is null, not Null.
Option B) false, 0, null - This option is correct. The default value for a boolean type is false, the default value for a numeric type is 0, and the default value for an object type is null.
Option C) true, 0, null - This option is incorrect because the default value for a boolean type is false, not true. Also, the default value for a numeric type is 0, not 1. Lastly, the default value for an object type is null, not Null.
Option D) true, 1, null - This option is incorrect because the default value for a boolean type is false, not true. Also, the default value for a numeric type is 0, not 1. Lastly, the default value for an object type is null, not null.
The correct answer is B. This option is correct because the default value for a boolean type is false, the default value for a numeric type is 0, and the default value for an object type is null.