1Z0-811 Arrays and Methods Practice Question
Given 'int[] source = {1,2,3,4,5};' and 'int[] dest = new int[3];' which code correctly copies the first three elements from source to dest using System.arraycopy?
⚠ Common exam trap
Oracle often tests the misconception that the `length` parameter refers to the total size of the destination array rather than the number of elements to copy, leading candidates to choose option B.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
System.arraycopy(source, 0, dest, 0, 3);
`System.arraycopy(source, 0, dest, 0, 3)` copies exactly three elements starting from index 0 of the source array to index 0 of the destination array, matching the requirement. The `length` argument (3) specifies the number of array elements to copy, and the destination array has a capacity of 3, so no `ArrayIndexOutOfBoundsException` occurs.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
System.arraycopy(source, 0, dest, 0, 3);
Why this is correct
Correct parameters.
- ✗
System.arraycopy(source, 0, dest, 0, 5);
Why it's wrong here
Length 5 exceeds dest length.
- ✗
System.arraycopy(source, 1, dest, 0, 3);
Why it's wrong here
sourcePos should be 0, not 1.
- ✗
System.arraycopy(source, 0, dest, 1, 3);
Why it's wrong here
destPos should be 0, not 1.
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