Add 2 and 4

src/main/java/adapter/ModelAdapter.java

@@ -24,28 +24,24 @@ public class ModelAdapter implements IModelAdapter, IObservable{
     @Override
     public void goUp() {
         model.goUp();
-        model.addRandomNumber();
         this.notifyObservers();
     }
 
     @Override
     public void goDown() {
         model.goDown();
-        model.addRandomNumber();
         this.notifyObservers();
     }
 
     @Override
     public void goLeft() {
         model.goLeft();
-        model.addRandomNumber();
         this.notifyObservers();
     }
 
     @Override
     public void goRight() {
         model.goRight();
-        model.addRandomNumber();
         this.notifyObservers();
     }
 

src/main/java/model/Board.java

@@ -20,6 +20,8 @@ public class Board implements IModel{
     }
 
     public void goUp() {
+        int [][] lastBoard=this.getCloneOfBoard();
+
         for(int i=0;i<this.board[0].length;i++){
 
             int[] column=this.lineAlgorithm.reverseLine(this.getColumn(i));
@@ -28,30 +30,48 @@ public class Board implements IModel{
             this.setColumn(this.lineAlgorithm.reverseLine(this.lineAlgorithm.mergeRight(column)), i);
 
         }
+        if(!boardsIsEquals(this.board,lastBoard)){
+            this.addRandomNumber();
+        }
 
     }
 
     public void goDown() {
+        int [][] lastBoard=this.getCloneOfBoard();
+
         for(int i=0;i<this.board[0].length;i++){
             int[] column=this.getColumn(i);
             this.setColumn(this.lineAlgorithm.mergeRight(column), i);
         }
+        if(!boardsIsEquals(this.board,lastBoard)){
+            this.addRandomNumber();
+        }
     }
 
     public void goLeft() {
+        int [][] lastBoard=this.getCloneOfBoard();
+
         for(int i=0;i<this.board.length;i++){
             int[] tmp=this.lineAlgorithm.reverseLine(board[i]);
             tmp=this.lineAlgorithm.mergeRight(tmp);
             tmp=this.lineAlgorithm.reverseLine(tmp);
             this.board[i]=tmp;
         }
+        if(!boardsIsEquals(this.board,lastBoard)){
+            this.addRandomNumber();
+        }
     }
 
 
     public void goRight() {
+        int [][] lastBoard=this.getCloneOfBoard();
+
         for(int i=0;i<this.board.length;i++){
             this.board[i]=this.lineAlgorithm.mergeRight(board[i]);
         }
+        if(!boardsIsEquals(this.board,lastBoard)){
+            this.addRandomNumber();
+        }
     }