In Java, which option both declares an int array and initializes it immediately with five specific numbers?
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AArray a = new Array(5);
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Bint [] a = {23, 22, 21, 20, 19};
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Cint a [] = new int[5];
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Dint [5] array;
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ENone of these
Answer
Correct Answer: int [] a = {23, 22, 21, 20, 19};
Explanation
Introduction / Context:Arrays in Java are objects with fixed length. You can declare and initialize them in one statement using an initializer list, which is common for known small datasets.
Given Data / Assumptions:
- We need both declaration and immediate initialization with five numbers.
- Java syntax, not C/C++ custom array syntax, applies.
Concept / Approach:Use the brace form: type[] name = {v1, v2, ...}. This creates the array object and fills it with the specified values. The length is inferred from the list.
Step-by-Step Solution:
Option B uses the correct brace initializer → valid.Option A references a non-existent Array type constructor in core Java → invalid.Option C only allocates length 5 with default zeros; it does not initialize with the given numbers.Option D uses illegal Java syntax (size in brackets on the left).Verification / Alternative check:Print a[0..4] after option B; it shows the listed values, not zeros.
Why Other Options Are Wrong:They either lack initialization values or use invalid types/syntax.
Common Pitfalls:Confusing Java with C-style declarations or assuming Array is a built-in type to construct directly.
Final Answer:int [] a = {23, 22, 21, 20, 19};