Create Valid-Sudoku

Valid-Sudoku

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+Determine if a 9 x 9 Sudoku board is valid. Only the filled cells need to be validated according to the following rules:
+
+Each row must contain the digits 1-9 without repetition.
+Each column must contain the digits 1-9 without repetition.
+Each of the nine 3 x 3 sub-boxes of the grid must contain the digits 1-9 without repetition.
+Note:
+
+A Sudoku board (partially filled) could be valid but is not necessarily solvable.
+Only the filled cells need to be validated according to the mentioned rules.
+
+Input: board = 
+[["5","3",".",".","7",".",".",".","."]
+,["6",".",".","1","9","5",".",".","."]
+,[".","9","8",".",".",".",".","6","."]
+,["8",".",".",".","6",".",".",".","3"]
+,["4",".",".","8",".","3",".",".","1"]
+,["7",".",".",".","2",".",".",".","6"]
+,[".","6",".",".",".",".","2","8","."]
+,[".",".",".","4","1","9",".",".","5"]
+,[".",".",".",".","8",".",".","7","9"]]
+Output: true
+
+class Solution {
+    public boolean isValidSudoku(char[][] board) {
+        HashSet<String> seen= new HashSet();
+        for(int i =0;i<9;i++){
+            for(int j=0;j<9;j++){
+                char Current_value = board[i][j];
+                if(Current_value != '.'){
+                    if(!seen.add(Current_value +"found in row"+i) || !seen.add(Current_value+"found in column"+j) || !seen.add(Current_value +"found in sub box"+i/3+ j/3))
+                        return false;
+                }
+            }
+        }
+        return true;
+
+
+    }
+}