Pass 2d Array to Method in Java

In this post, we will look at the way to pass a 2d array to a method in Java. We will also look at how to return it.

Program to Pass 2d Array to function:

public class Pass2dArray {
	public static void main(String[] args) {
		int[][] a = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
		acceptIt(a); // pass it to the method
	}

	public static void acceptIt(int[][] a) {
		System.out.println("Elements are :");

		for (int i = 0; i < a.length; i++) {
			for (int j = 0; j < a[i].length; j++) {
				System.out.print(a[i][j] + "\t");
			}
			System.out.println("");
		}
	}
}

Output:

Elements are :
1	2	3
4	5	6
7	8	9

We passed a 2d array to a method and printed it. Whatever changes you make to array in the method are reflected in the main().

Return a two dimensional Array from a method:

public class ReturnTwoDimensionalArray {
	public static void main(String[] args) {
		int b[][] = returnIt();
		System.out.println("Length is : " + b.length);
	}

	// returns a 2d array
	public static int[][] returnIt() {
		int[][] b = { { 1, 2, 3 }, { 4, 5, 6 }, { 7, 8, 9 } };
		return b;
	}
}

Output:

Length is : 3

In the above program, we returned a two-dimensional array from a method.

As we saw it is very simple to pass or return multidimensional array to/from the method.

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