@@ -68,4 +68,12 @@ public void turnOn() {
         color = ON;
     }
 
+	public void flip() {
+		if (isOn()) {
+			turnOff();
+		} else {
+			turnOn();
+		}
+	}
+
 }
@@ -61,11 +61,7 @@ public Cell getCell(int r, int c) {
      */
     public void flip(int r, int c) {
         Cell cell = array[r][c];
-        if (cell.isOff()) {
-            cell.turnOn();
-        } else {
-            cell.turnOff();
-        }
+        cell.flip();
     }
 
     /**
@@ -119,5 +115,4 @@ public void paint(Graphics g) {
     public void update(Graphics g) {
         draw(g);
     }
-
 }
Original file line number	Diff line number	Diff line change
`@@ -68,4 +68,12 @@ public void turnOn() {`
`68`	`68`	`color = ON;`
`69`	`69`	`}`
`70`	`70`
	`71`	`+ public void flip() {`
	`72`	`+ if (isOn()) {`
	`73`	`+ turnOff();`
	`74`	`+ } else {`
	`75`	`+ turnOn();`
	`76`	`+ }`
	`77`	`+ }`
	`78`	`+`
`71`	`79`	`}`
Original file line number	Diff line number	Diff line change
`@@ -61,11 +61,7 @@ public Cell getCell(int r, int c) {`
`61`	`61`	`*/`
`62`	`62`	`public void flip(int r, int c) {`
`63`	`63`	`Cell cell = array[r][c];`
`64`		`- if (cell.isOff()) {`
`65`		`- cell.turnOn();`
`66`		`- } else {`
`67`		`- cell.turnOff();`
`68`		`- }`
	`64`	`+ cell.flip();`
`69`	`65`	`}`
`70`	`66`
`71`	`67`	`/**`
`@@ -119,5 +115,4 @@ public void paint(Graphics g) {`
`119`	`115`	`public void update(Graphics g) {`
`120`	`116`	`draw(g);`
`121`	`117`	`}`
`122`		`-`
`123`	`118`	`}`