Java Array
Java Array
Java Array:
In Java, an array is a collection of elements of the same data type, stored in a contiguous memory location. Arrays in Java are of fixed size, which means that once an array is created, its size cannot be changed.
To declare an array in Java, you need to specify the data type of the elements in the array, followed by square brackets [] and the name of the array variable. Here’s an example:
int[] numbers;
To create an array, you need to use the new keyword followed by the data type and the size of the array in square brackets. Here’s an example:
numbers = new int[5];
In the example above, we create an integer array of size 5. The array elements are initialized to their default value, which is 0 for integer.
You can also declare and initialize an array in a single statement, like this:
int[] numbers = {1, 2, 3, 4, 5};
In the example above, we create an integer array and initialize it with the values {1, 2, 3, 4, 5}.
You can access the elements of an array using their index, which starts at 0. Here’s an example:
int thirdNumber = numbers[2]; // get the third element (index 2)
You can also assign values to array elements using their index. Here’s an example:
numbers[0] = 10; // assign 10 to the first element (index 0)
Arrays in Java have a length property that returns the size of the array. Here’s an example:
Arrays in Java have a length property that returns the size of the array. Here's an example:
Arrays can also be passed as arguments to methods, and can be used to return multiple values from a method.
public static int[] getNumbers() {
int[] numbers = {1, 2, 3, 4, 5};
return numbers;
}
int[] numbers = getNumbers(); // get an array of numbers
Overall, arrays are a fundamental data structure in Java, and are used extensively in Java programming.