How to change one array's values from another array?

Question

String [] board = new String [9];
String [] sequence = new String [8];

sequence[0] = board[0]+board[1]+board[2];
sequence[1] = board[0]+board[3]+board[6];
sequence[2] = board[0]+board[4]+board[8];
sequence[3] = board[1]+board[4]+board[7];
sequence[4] = board[2]+board[5]+board[8];
sequence[5] = board[2]+board[4]+board[6];
sequence[6] = board[3]+board[4]+board[5];
sequence[7] = board[6]+board[7]+board[8];

Say I was to make sequence[0]="XXO";

How could I take sequence[0] and change the the board points so that:

board[0]="X";
board[1]="X";
board[2]="O";

I am trying to run this for loop and I have to initialize the board array before the sequences part as I am printing it out to the screen and can't have the values be null.

for(int i = 0; i < 8; i++
{
    if(sequence[i].equals("X"+"X"+" "))
    {
        sequence[i] = "XXO";
    }
}

now it is more complicated, what did you mean by choice+choice i really don't get you — Youcef LAIDANI
– Youcef LAIDANI, Commented Jun 3, 2017 at 18:48
I am making a TicTacToe game where the person can choose what they want to be and the computer chooses the opposite of that, but I edited to make more sense to you now. I also do not want to hard code all of the ways that one could win so I thought this would be much easier, but I need to make it so that the sequence changes the board slots. — Nathan Matteson
– Nathan Matteson, Commented Jun 3, 2017 at 18:50
why you don't use List instead maybe you need something like this List<String> board = new ArrayList<>(); String[] sequence = new String[8]; for (int i = 0; i < 8; i++) { if (sequence[i].equals("X" + "X" + " ")) { sequence[i] = "XXO"; board.addAll(Arrays.asList(sequence)); } } ? — Youcef LAIDANI
– Youcef LAIDANI, Commented Jun 3, 2017 at 18:54

Youcef LAIDANI · Accepted Answer · 2017-06-03 17:52:01Z

1

You can use String::split which return an array of String for example :

String[] board;//you could also to not initialize the array here 
               //because you will do that in split
String[] sequence = new String[8];
sequence[0] = "XXO";
board = sequence[0].split("");//split and initialize the board array

//print the values
System.out.println(board[0]);
System.out.println(board[1]);
System.out.println(board[2]);

Output

X
X
O

edited Jun 3, 2017 at 17:52

answered Jun 3, 2017 at 17:25

Youcef LAIDANI

60.2k21 gold badges111 silver badges178 bronze badges

Sign up to request clarification or add additional context in comments.

9 Comments

dumbPotato21 Over a year ago

note that java 7(to which you have linked to) and below, would result in an empty String at the beginning, when using string.split(""). For this reason, you should probably link to the Java 8 Docs. For Java 8, and above, your way is perfect. Take an upvote

Youcef LAIDANI Over a year ago

thank you @ChandlerBing i appreciate it, but i really don't get you what is the difference between split in java 7 and java 8 sorry what did you mean by would result in an empty String at the beginning, when using string.split(""). For this reason, you should probably link to the Java 8 Docs. For Java 8, and above ?

dumbPotato21 Over a year ago

I was referring to this. Why in Java 8 split sometimes removes empty strings at start of result array?

Youcef LAIDANI Over a year ago

waahhh this is really a new information for me, thank you @ChandlerBing you already teach me something new, so i should to change the link to java 8 right?

dumbPotato21 Over a year ago

Haha, I feel honored!

|

Chai T. Rex · Accepted Answer · 2017-06-03 17:31:59Z

0

You generally shouldn't store the same data in different ways (the Don't Repeat Yourself principle), sometimes because it leads to a mess like this.

One correct way to do what you want is the following:

board[0] = String.valueOf(sequence[0].charAt(0));
board[1] = String.valueOf(sequence[0].charAt(1));
board[2] = String.valueOf(sequence[0].charAt(2));

answered Jun 3, 2017 at 17:31

Chai T. Rex

3,0491 gold badge18 silver badges35 bronze badges

Comments

Nadeem · Accepted Answer · 2017-06-03 17:34:33Z

0

As you want only one character as an element in your board array you can use character array instead of String array and then can use

char board[] = new char[9];
board = sequence[0].toCharArray();

answered Jun 3, 2017 at 17:34

Nadeem

1311 gold badge2 silver badges13 bronze badges

Collectives™ on Stack Overflow

How to change one array's values from another array?

3 Answers 3

9 Comments

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

9 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related