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1Z0-811 Java Basics and Syntax Practice Question
Arrange the steps to declare and initialize a one-dimensional array in Java in the correct order.
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
✓
Step 1: Declare array variable (e.g., int[] arr;), Step 2: Allocate memory using new keyword (e.g., arr = new int[5];), Step 3: Assign values to elements (e.g., arr[0] = 1; arr[1] = 2; ...).
The process involves declaring the array variable, then assigning it a new array or initializer, and optionally providing initial values.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
Step 1: Declare array variable (e.g., int[] arr;), Step 2: Allocate memory using new keyword (e.g., arr = new int[5];), Step 3: Assign values to elements (e.g., arr[0] = 1; arr[1] = 2; ...).
Why this is correct
This is the correct order because you must first declare the variable to have a reference, then allocate memory for the array, and then initialize individual elements if needed. Alternatively, you can combine steps 2 and 3 using an initializer list.
- ✗
Step 1: Allocate memory using new keyword, Step 2: Declare array variable, Step 3: Assign values.
Why it's wrong here
This is incorrect because you cannot allocate memory without a declared variable to hold the reference. The declaration must come before or at the same time as allocation.
- ✗
Step 1: Assign values to elements, Step 2: Declare array variable, Step 3: Allocate memory.
Why it's wrong here
This is incorrect because you cannot assign values to an array that has not been declared or allocated. The array object must exist before you can set its elements.
- ✗
Step 1: Declare array variable, Step 2: Assign values to elements, Step 3: Allocate memory.
Why it's wrong here
This is incorrect because assigning values before allocating memory would cause a NullPointerException, as the array reference is null until memory is allocated.
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