Iam new to java. Can you fix my error?

public class sudoku2 {
    static int[][] grid = new int[9][9];

    public static void main(String[] args) {
        showSudoku();

        tryNumber(0, 4, 5);
        tryNumber(1, 8, 1);
        tryNumber(2, 6, 9);
        tryNumber(3, 0, 2);
        tryNumber(4, 1, 9);
        tryNumber(5, 7, 3);
        tryNumber(6, 8, 7);
        tryNumber(7, 3, 6);
        tryNumber(8, 7, 5);
        tryNumber(4, 4, 1);
        tryNumber(7, 3, 9);
        tryNumber(6, 7, 8);
        tryNumber(5, 6, 7);
        tryNumber(4, 5, 6);
        tryNumber(3, 4, 7);
        tryNumber(2, 3, 4);
        tryNumber(1, 2, 3);
        tryNumber(2, 4, 2);
        tryNumber(2, 4, 2);

        showSudoku();
    }

    static void showSudoku() {
        System.out.println("-------------------------");
        for (int x = 0; x < 9; x++) {
            System.out.print("| ");
            for (int y = 0; y < 9; y++) {
                if (grid[x][y] == 0) {
                    System.out.print(".");
                } else {
                    System.out.print(grid[x][y]);
                }
                System.out.print(" ");
                if (y % 3 == 2) {
                    System.out.print("| ");
                }
            }
            System.out.println();
            if (x % 3 == 2) {
                System.out.println("-------------------------");
            }
        }
    }

    static void insert(int x, int y, int zahl) {
        if (!(x < 0 || x > 8 || y < 0 || y > 8 || zahl < 1 || zahl > 9) && grid[x][y] == 0) {
            grid[x][y] = zahl;
        } else {
            // Do nothing
        }
    }

    static boolean conflictInRow(int x, int y) {
        for (int i = 0; i < 9; i++) {
            if (grid[x][i] == y)
                return true;
        }
        return false;
    }

    static boolean conflictInColumn(int x, int y) {
        for (int i = 0; i < 9; i++) {
            if (grid[i][y] == x)
                return true;
        }
        return false;

    }

    static boolean conflictInSquare(int x, int y) {
        int zeile = x - x % 3;
        int spalte = y - y % 3;

        for (int i = zeile; i < zeile + 3; i++) {
            for (int j = spalte; j < spalte + 3; j++)
                if (grid[i][j] == 9)
                    return true;

        }
        return false;
    }

    static boolean anyConflict(int x, int y) {
        if (conflictInRow(x, y) == true && conflictInColumn(x, y) == true && conflictInSquare(x, y) == true) {
            return true;
        }
        return false;
    }

    static boolean tryNumber(int x, int y, int zahl) {
        if (anyConflict(x, y) == false) {
            insert(x, y, zahl);
            return true;

        }
        showSudoku();
        return false;
    }
}

I’ve edited your post for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read.

You can also use the “preformatted text” tool in the editor (</>) to add backticks around text.

See this post to find the backtick on your keyboard.
Note: Backticks (`) are not single quotes (’).

What is your error? What are you expecting this code to do versus what it does do?