Check if Matrix Is X-Matrix LeetCode solution in Java

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class Solution {
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  public boolean checkXMatrix(int[][] grid) {
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    int n = grid.length;
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    for (int i = 0; i < n; i++) {
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      for (int j = 0; j < n; j++) {
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        if (i == j || i + j == n - 1) {
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          if (grid[i][j] == 0) return false;
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        } else if (grid[i][j] != 0) return false;
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      }
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    }
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    return true;
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  }
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}