Java – Array as parameter

Passing array as a parameter to a method:

• We can address of array as a parameter to method.
• Using the address, we can process elements of that array.

class Main
{
	public static void main(String[] args) 
	{
		int arr[ ] = {10,20,30,40,50};
		Main.display(arr);
	}
	static void display(int list[])
	{
		System.out.println("Array elements are : ");
		for (int i=0 ; i<list.length ; i++)
		{
			System.out.println(list[i]);
		}
	}
}

• Passing array is nothing but passing memory address of block.
• Using the address, we can process elements are array.
• Duplicate array will not be created. Just address will be shared.

class Main
{
	public static void main(String[] args) 
	{
		int arr[ ] = {10,20,30,40,50};
		Main.modify(arr);
		System.out.println("Array elements are : ");
		for (int i=0 ; i<arr.length ; i++)
		{
			System.out.println(arr[i]);
		}
	}
	static void modify(int list[])
	{
		for (int i=0 ; i<list.length ; i++)
		{
			list[i] = list[i] + 5;
		}
	}
}

Method returns array:

• A method can take array as an input and can return the array as output.
• Return type should be an array in the prototype of function

class Main
{
	public static void main(String[] args) 
	{
		int x[ ] = Main.test();
		System.out.println("Array elements are : ");
		for (int i=0 ; i<x.length ; i++)
		{
			System.out.println(x[i]);
		}
	}
	static int[] test()
	{
		int arr[ ] = {10,20,30,40,50};
		return arr;
	}
}