fixed some mistakes 5

src/main/java/core/basesyntax/Application.java

@@ -1,13 +1,13 @@
 package core.basesyntax;
 
 public class Application {
+    private static final int NUMBER_OF_BALLS = 3;
+
     public static void main(String[] args) {
 
         Lottery lottery = new Lottery();
 
-        final int numberOfBalls = 3;
-
-        for (int i = 0; i < numberOfBalls; i++) {
+        for (int i = 0; i < NUMBER_OF_BALLS; i++) {
             Ball ball = lottery.getRandomBall();
             System.out.println(ball);
         }

src/main/java/core/basesyntax/Ball.java

@@ -4,8 +4,8 @@ public class Ball {
     private final Color color;
     private final int number;
 
-    public Ball(String color, int number) {
-        this.color = Color.valueOf(color);
+    public Ball(Color color, int number) {
+        this.color = color;
         this.number = number;
     }
 

src/main/java/core/basesyntax/ColorSupplier.java

@@ -3,13 +3,11 @@
 import java.util.Random;
 
 public class ColorSupplier {
-    private Random random = new Random();
-
-    public String getRandomColor() {
+    private final Random random = new Random();
 
+    public Color getRandomColor() {
         Color[] colors = Color.values();
-        int randomIndex = random.nextInt(colors.length);
-
-        return colors[randomIndex].name();
+        int index = random.nextInt(colors.length);
+        return colors[index];
     }
 }

src/main/java/core/basesyntax/Lottery.java

@@ -4,13 +4,13 @@
 
 public class Lottery {
 
-    private final int maxBallCount = 100;
-    private Random random = new Random();
-    private ColorSupplier colorSupplier = new ColorSupplier();
+    private final static int MAX_BALL_COUNT = 100;
+    private final Random random = new Random();
+    private final ColorSupplier colorSupplier = new ColorSupplier();
 
     public Ball getRandomBall() {
-        String color = colorSupplier.getRandomColor();
-        int number = random.nextInt(maxBallCount) + 1;
+        Color color = colorSupplier.getRandomColor();
+        int number = random.nextInt(MAX_BALL_COUNT) + 1;
         return new Ball(color, number);
     }
 }