Correct way to declare an array in Java

In Java, an array is a data structure that allows us to store multiple values of the same type in a single variable. To declare an array in Java, we need to specify the type of elements the array will hold, followed by the array name. There are several ways to declare an array in Java, but the correct way is option 'A': int[] arr.

Explanation:
Let's understand why option 'A' is the correct way to declare an array in Java.

1. int[] arr;
This syntax specifies that we are declaring an integer array named 'arr'. The square brackets '[]' after the 'int' keyword indicate that 'arr' is an array. This is the most common and recommended way to declare an array in Java.

2. int arr[];
This syntax is also valid in Java, but it is less preferred. It declares 'arr' as an integer array, but the brackets after the array name are considered part of the array name, rather than the type. It may lead to confusion and is not consistent with the rest of the Java syntax.

3. int arr = new int[];
This syntax is incorrect because it is trying to assign an array object to a single integer variable. In Java, arrays are objects, so we need to use the 'new' keyword to create an instance of the array. Additionally, we need to specify the size of the array or initialize it with values.

4. int arr = {1, 2, 3};
This syntax is also incorrect because it is trying to assign an array initializer to a single integer variable. Although this syntax is valid for initializing an array at the time of declaration, it cannot be used for array declaration alone.

In conclusion, the correct way to declare an array in Java is by using the syntax 'int[] arr;'. This syntax clearly indicates that 'arr' is an integer array and is consistent with the Java language conventions.