The program updated to version 0.2

Change "map" and "visualMap" fields to "static map" and "static visualMap" fields.
Change "public Board()" constructor to "public static void initialisingBoard()" method.
Change "public void printMap()" method to "static public void printMap()" method.

Board.java

@@ -3,78 +3,91 @@ import java.io.IOException;
 /**
  * This class represents status of board and update its.
  * @author Rezvanian 9831029
- * @version 0.1
+ * @version 0.2
  */
 
 public class Board implements IBoard  {
-    private final int SIZE = 9;
+    private static final int SIZE = 9;
     //for programmer
+    private static char[] map = new char[81];
+
+    
+    /*
+    Access in version 0.1
     private char[] map;
+    */    
+    
+    
     //for user
+    private static char[][] visualMap = new char[4 * 9 + 1][8 * 9 + 1];
+    
+    /*
+    Access in version 0.1
     private char[][] visualMap;
+    */
 
     /**
      * This constructor, initialise the fields.
      */
-    public Board(){
+    public static void initialisingBoard(){
 
         map = new char[81];
         for (int i = 0; i < SIZE * SIZE; i++){
             switch (i){
                 case 0:{
-                    this.map[i] = '+';
+                    map[i] = '+';
                 }
                 case 1:{
-                    this.map[i] = 'A';
+                    map[i] = 'A';
                 }
                 case 2:{
-                    this.map[i] = 'B';
+                    map[i] = 'B';
                 }
                 case 3:{
-                    this.map[i] = 'C';
+                    map[i] = 'C';
                 }
                 case 4:{
-                    this.map[i] = 'D';
+                    map[i] = 'D';
                 }
                 case 5:{
-                    this.map[i] = 'E';
+                    map[i] = 'E';
                 }
                 case 6:{
-                    this.map[i] = 'F';
+                    map[i] = 'F';
                 }
                 case 7:{
-                    this.map[i] = 'G';
+                    map[i] = 'G';
                 }
                 case 8:{
-                    this.map[i] = 'H';
+                    map[i] = 'H';
                 }
                 case 9:{
-                    this.map[i] = '1';
+                    map[i] = '1';
                 }
                 case 18:{
-                    this.map[i] = '2';
+                    map[i] = '2';
                 }
                 case 27:{
-                    this.map[i] = '3';
+                    map[i] = '3';
                 }
                 case 36:{
-                    this.map[i] = '4';
+                    map[i] = '4';
                 }
                 case 45:{
-                    this.map[i] = '5';
+                    map[i] = '5';
                 }
                 case 54:{
-                    this.map[i] = '6';
+                    map[i] = '6';
                 }
                 case 63:{
-                    this.map[i] = '7';
+                    map[i] = '7';
                 }
                 case 72:{
-                    this.map[i] = '8';
+                    map[i] = '8';
                 }
                 default:{
-                    if (this.map[i] != 'w' || this.map[i] != 'b')
-                        this.map[i] = ' ';
+                    if (map[i] != 'w' || map[i] != 'b')
+                        map[i] = ' ';
                 }
             }
         }
@@ -87,7 +100,7 @@ public class Board implements IBoard  {
                 }else if (yColumn % 8 == 0){
                     visualMap[xRow][yColumn] = '*';
                 } else {
-                    if (this.visualMap[xRow][yColumn] != 'w' || this.visualMap[xRow][yColumn] != 'b')
+                    if (visualMap[xRow][yColumn] != 'w' || visualMap[xRow][yColumn] != 'b')
                         visualMap[xRow][yColumn] = ' ';
                 }
             }
@@ -125,7 +138,7 @@ public class Board implements IBoard  {
         return visualMap;
     }
 
-    public void printMap() throws IOException, InterruptedException{
+    static public void printMap() throws IOException, InterruptedException{
 
         //clear terminal for refresh.
         new ProcessBuilder("cmd", "/c", "cls").inheritIO().start().waitFor();
@@ -141,18 +154,18 @@ public class Board implements IBoard  {
         }
     }
 
-    //Access in version 0.0
+    /*Access in version 0.0
 
-/*    public void setMapByPosition(int position, char nut){
+   public void setMapByPosition(int position, char nut){
         map[position] = nut;
     }
 
     public void setVisualMapByPosition(int xPosition, int yPosition, char nut){
         xPosition = 8 * (xPosition - 1) + 4;
         yPosition = 4 * (yPosition - 1) + 2;
-        this.visualMap[yPosition][xPosition] = nut;
+        visualMap[yPosition][xPosition] = nut;
     }
-*/
+    */
 
     public int searchPosition(char c){
         switch (c){
@@ -186,15 +199,15 @@ public class Board implements IBoard  {
         }
     }
 
-    public void refresh() throws IOException, InterruptedException {
+    public static void refresh() throws IOException, InterruptedException {
         printMap();
     }
 
-    public void setVisualMap(char[][] visualMap) {
-        this.visualMap = visualMap;
+    public void setVisualMap(char[][] map) {
+        visualMap = map;
     }
 
-    public void setMap(char[] map) {
-        this.map = map;
+    public void setMap(char[] map2) {
+        map = map2;
     }
 }
\ No newline at end of file