changed return type boolean of Method setField

javadoc added

src/Gamefield.java

@@ -1,48 +1,59 @@
+
+
 public class Gamefield {
-    private int field1, field2, field3, field4, field5, field6, field7, field8, field9;
+    private int field1 = 0, field2 = 0, field3 = 0, field4 = 0, field5 = 0, field6 = 0, field7 = 0, field8 = 0, field9 = 0;
 
-    Gamefield() {
-        field1 = 0;
-        field2 = 0;
-        field3 = 0;
-        field4 = 0;
-        field5 = 0;
-        field6 = 0;
-        field7 = 0;
-        field8 = 0;
-        field9 = 0;
-    }
+    /**
+     * Constructor of class Gamefield
+     */
+    Gamefield() {}
 
-    public void setField(int field, int player) {
-            if(field == 1) {
+    /**
+     * Method to set a field when it is set from player
+     * @param field the field which should be set. (1-9)
+     * @param player the player who sets the field (1 or 2)
+     * @return true --> field is set, false --> field isn't set because it's already set or it doesn't exist.
+     */
+    public boolean setField(int field, int player) {
+        if(field == 1 && field1 == 0) {
             field1 = player;
         }
-            else if(field == 2) {
+        else if(field == 2 && field2 == 0) {
             field2 = player;
         }
-            else if(field == 3) {
+        else if(field == 3 && field3 == 0) {
             field3 = player;
         }
-            else if(field == 4) {
+        else if(field == 4 && field4 == 0) {
             field4 = player;
         }
-            else if(field == 5) {
+        else if(field == 5 && field5 == 0) {
             field5 = player;
         }
-            else if(field == 6) {
+        else if(field == 6 && field6 == 0) {
             field6 = player;
         }
-            else if(field == 7) {
+        else if(field == 7 && field7 == 0) {
             field7 = player;
         }
-            else if(field == 8) {
+        else if(field == 8 && field8 == 0) {
             field8 = player;
         }
-            else if(field == 9) {
+        else if(field == 9 && field9 == 0) {
             field9 = player;
         }
+        else {
+            return false; //if field is already set or it doesn't exist.
+        }
+        return true; //if change is done
     }
 
+
+    /**
+     *
+     * @param field the number of the requested field
+     * @return integer of the player, which has set the requested field (1 -> Player 1, 2 -> Player 2, -1 --> the requested field doens't exist.)
+     */
     public int getField(int field) {
         if(field == 1) {
             return field1;
@@ -71,30 +82,25 @@ public class Gamefield {
         else if(field == 9) {
             return field9;
         }
-        return -1;
+        return -1; //if the requested field doesn't exist, -1 will be returned.
     }
 
+    /**
+     * Method to print field
+     */
     public void outputField() {
-        System.out.print(getSymbol(field1));
-        System.out.print("|");
-        System.out.print(getSymbol(field2));
-        System.out.print("|");
-        System.out.println(getSymbol(field3));
-        System.out.println("_____");
-        System.out.print(getSymbol(field4));
-        System.out.print("|");
-        System.out.print(getSymbol(field5));
-        System.out.print("|");
-        System.out.println(getSymbol(field6));
-        System.out.println("_____");
-        System.out.print(getSymbol(field7));
-        System.out.print("|");
-        System.out.print(getSymbol(field8));
-        System.out.print("|");
-        System.out.println(getSymbol(field9));
-
+        System.out.println(getSymbol(field1) + "|" + getSymbol(field2) + "|" + getSymbol(field3));
+        System.out.println("-----");
+        System.out.println(getSymbol(field4) + "|" + getSymbol(field5) + "|" + getSymbol(field6));
+        System.out.println("-----");
+        System.out.println(getSymbol(field7) + "|" + getSymbol(field8) + "|" + getSymbol(field9));
     }
 
+    /**
+     *
+     * @param player number of player who has set the field (1 or 2)
+     * @return the Symbol of the player who has set the field (X or O)
+     */
     private String getSymbol(int player) {
         if(player == 1) {
             return "X";

src/TicTacToe.java

@@ -1,7 +1,10 @@
 public class TicTacToe {
 
     public static void main(String[] args) {
-        System.out.println("test");
+        Gamefield gamefield = new Gamefield();
+        gamefield.setField(1, 1);
+        gamefield.setField(7, 2);
+        gamefield.outputField();
     }
 
     public TicTacToe(String int1, int int2) {