How to replace elements in a 2D array in Java? Okay so for my program, I am trying to create a fish tank. My program is to generate 4 different FISH: ><))'> in a tank of tilde (~) characters. The tank is a 2D array of 8 rows and 32 columns so it would look like ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ for one of the eight rows (before I generate the random positions of the fish in the rank). Then one row could look like ~~~~~~~~~~><))'>~~~~~~~~~~~~~~~~ after I generate random positions for my fish. It should also hide characters of the fishes body if it is more to the left like such )'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ where there is only three parts of the fish, 2 body characters and the head character.The random position coordinate I have generated for each of the four fishes starts on the head of the fish (>) which means I have been able to successfully generate four > in the tank, which looks like ~~~~~~~~~~~~~~~~>~~~~~~~~~~~~~~~ when ran. But my problem is how I can get the rest of the fishes body after the head. I know I am going to be working backwards from the > character and replace the tilde characters with characters from the fishes body. Some steps that would explain it and some suggestions would be nice. I am just getting back into basic coding so a good explanation would be VERY HELPFUL since some "experts" on Chegg don't always see through the student's eyes. Here is some of the code below.

import java.util.Random;

public class Main {

public static void main(String[] args) {

char [][] tilde = new char [8][32];

fillTank(tilde, '~');

int fish [][] = generateRandomPositions(4, 8, 32);

for (int i = 0; i < fish.length; ++i) {

placeFishInTank(tilde, fish[i][0], fish[i][1]);

}

renderTank(tilde);

//int fishHook [][] = generateRandomPositions(1, 8, 32)

//int fishFood [][] = generateRandomPositions(6, 8, 32)

}

/**

* Copies the water character into every position in the tank array. The two-dimensional tank

* array can have dimensions of any size(s).

*

* @param tank will contain all water characters after this method is called.

* @param water is the character copied into the tank.

*/

public static void fillTank(char[][] tank, char water)

{

for (int row = 0; row < tank.length; ++row) {

for (int column = 0; column < tank[row].length; ++column) {

tank [row][column] = '~';

}

System.out.println();

}

}

public static void placeFishInTank(char [][] positionInTank, int x, int y)

{

positionInTank[x][y] = '>';

String fishBody = "><))\'";

char[] fishBodyArray = fishBody.toCharArray();

int j = 4;

for (int i = y - 1; i >= 0; i--) {

positionInTank[x][i] = fishBodyArray[j];

j--;

}

}

// for (int i = 0; i < positionInTank.length - 1; i++) {

// positionInTank[i] = positionInTank[i - 1];

// positionInTank[i] = '(';

// for (int j = 0; i < positionInTank[x].length-1; j++)

// if (positionInTank[][] >= 0) {

// String.charAt(i, j);

// }

// }

//if (positionInTank[row].length - 1 != 0) {

//add on next character '\''

// }

//if (!positionInTank[row] - 2 != 0) {

//add on next character ')'

// }

//if (!positionInTank[row] - 3 != 0) {

//add on next character ')'

// }

//if (!positionInTank[row] - 4 != 0) {

//add on next character '<'

// }

//if (!positionInTank[row] - 5 != 0) {

//add on next character '>'

// }

/**

* Prints the contents of the tank into the console in row major order, so that the

* smallest row indexes are on top and the smallest column indexes are on the left. For

* example:

* tank[0][0] tank[0][1] tank[0][2] ...

* tank[1][0] tank[1][1] tank[1][2] ...

* ...

* Each row is on its own line, and this method should work for two-dimensional tanks with

* dimensions of any size.

*

* @param tank contains the characters that will be printed to the console.

*/

public static void renderTank(char[][] tank)

{

for (int row = 0; row < tank.length; ++row) {

for (int column = 0; column < tank[row].length; ++column) {

System.out.print(tank[row][column]);

}

System.out.println();

}

}

public static int[][] generateRandomPositions(int number, int width, int height) //width and height different

{

int [][] fish = new int [number][2];

for (int i = 0; i < number; ++i) {

fish [i][0] = Utility.randomInt(width);

fish [i][1] = Utility.randomInt(height);

}

return fish;

}

//public static void moveAllFish(int[][]fish, int width, int height) {

//}

}