Swap 2 dimensional Array

[whit3ang3l]

Hi, i have got a problem with 2 dimensional array

int[][] box = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};

|1 2 3|
|4 5 6|
|7 8 9|
then i want to swap number 8 with 7 with method
but, i want that swap happen only in method.
My friend told me Array in java is object, so if i use method, the variable box on method parameter and int box on the main will have same memory adress
If I swap 7 8 on the method, it change the box in the main too.

so how to swap it without change the original array in main ?
he told me to use
copyArray[][] = box.clone();
then put copyArray into method parameter
but it doesn't work.
box contents was still changing.

Please help me thanks

[Eranga]

Your requirement is not that much clear to me. Do you want to swap number 7 and 8 in that array? Only that, not others?

[whit3ang3l]

Your requirement is not that much clear to me. Do you want to swap number 7 and 8 in that array? Only that, not others?

I want to swap number 7, 8 in that array without changing the array in the main
example :

public class Test {
	public static void main(String[] args) {
		int array[][] = {{1, 2, 3}, {4, 5, 6}, {7, 8, 9}};
		int copyArray[][] = array.clone();
		printArray(array);
		swap(copyArray);
		printArray(array);
		
	}
	public static void swap(int[][] arr) {
		int temp = arr[2][1];
		arr[2][1] = arr[2][0];
		arr[2][0] = temp;
	}
	public static void printArray(int[][] arr) {
		for(int a = 0; a < 3; a++) {
			for(int b = 0; b < 3; b++)
				System.out.print(arr[a][b] + " ");
			System.out.println();
		}
		System.out.println();
	}

}

the original array on main also changed
I want swap only arr[][] in the parameter function, not the array in the main.

[JosAH]

Cloning an array doesn't make a deep copy of the array; also make copies of each row for a 'deep' copy.

kind regards,

Jos

[Eranga]

A shallow copy, isn't it...