尝试以数独样式打印2d数组

Question

So I'm trying to do a method show() for a Sudoku class. which uses a (9x9)2d array. this method show print the array in Sudoku style but I'm not sure how to implement it . I would really appreciate some help.

I'v already tried some "for loops" but as I said I don't really know how to separate the array in 3x3 squares. I'v included a small part of the code.

public void show()

{ 
    for(int[]row : values)
    {
        for(int value : row)
        {
            System.out.print(value);
            System.out.print("\t");
        }
        System.out.println();
    }
}

the output that I need, may be something like this

0 0 0 | 0 0 0 | 0 0 0

0 0 0 | 0 0 0 | 0 0 0

0 0 0 | 0 0 0 | 0 0 0

---

0 0 0 | 0 0 0 | 0 0 0

0 0 0 | 0 0 0 | 0 0 0

0 0 0 | 0 0 0 | 0 0 0

---

0 0 0 | 0 0 0 | 0 0 0

0 0 0 | 0 0 0 | 0 0 0

0 0 0 | 0 0 0 | 0 0 0

current output:

0 0 0 8 5 9 3 0 0
5 0 4 3 2 0 8 0 0
0 0 3 0 0 7 0 9 0
0 4 5 1 0 0 0 0 0
2 7 8 0 0 0 9 1 6
0 0 0 0 0 8 4 2 0
0 3 0 6 0 0 2 0 0
0 0 1 0 9 3 6 0 7
0 0 2 7 8 5 0 0 0

Answer 1

If you are only missing the vertical lines in each row, you can add a conditional print statement in the line, so after the second and sixth element you add a vertical line. Maybe something like the following:

if(rowIndex == 2 || rowIndex == 5) {
    System.out.print("|");
}

edit: one thing to mention with this is that you will need to change your loops to keep track of which index you are at.

Try the following:

for(int[]row:values)
    {
        for(int rowIndex = 0; rowIndex < row.length(); rowIndex++)
        {
            System.out.print(row[rowIndex]);
            System.out.print("\t");

            if(rowIndex == 2 || rowIndex == 5) {
                 System.out.print("|");
                 System.out.print("\t");
            }
        }
        System.out.println();
    }
}

Answer 2

public void show()
{ 
    for(int x = 0 ; x < 9 ; x++)
    {
        for(int y = 0 ; y < 9 ; y++)
        {
            System.out.print(values[x][y]);
            System.out.print("\t");
            if ((y + 1) % 3 == 0) {
                System.out.print("|\t");
            }
        }
        System.out.println();
        if ((x + 1) % 3 == 0) {
            System.out.println("----------------------");
        }
    }
}