fixed common mistakes mentioned in README:

-added constants
-added for loop
-added class-level variables
-changes static method

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

@@ -2,8 +2,8 @@
 
 public class Application {
     public static void main(String[] args) {
-        System.out.println(Lottery.getRandomBall());
-        System.out.println(Lottery.getRandomBall());
-        System.out.println(Lottery.getRandomBall());
+        for (int i = 0; i < 3; i++) {
+            System.out.println(Lottery.getRandomBall());
+        }
     }
 }

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

@@ -3,7 +3,11 @@
 import java.util.Random;
 
 public class ColorSupplier {
-    public static Color getRandomColor() {
-        return Color.values()[new Random().nextInt(6)];
+    private static final int COLOR_ENUM_SIZE = Color.values().length;
+
+    private static final Random random = new Random();
+
+    public Color getRandomColor() {
+        return Color.values()[random.nextInt(COLOR_ENUM_SIZE)];
     }
 }

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

@@ -3,7 +3,12 @@
 import java.util.Random;
 
 public class Lottery {
+    private static final int MAX_NUMBER = 100;
+
+    private static final ColorSupplier colorSupplier = new ColorSupplier();
+    private static final Random random = new Random();
+
     public static Ball getRandomBall() {
-        return new Ball(new Random().nextInt(101), ColorSupplier.getRandomColor());
+        return new Ball(random.nextInt(MAX_NUMBER + 1), colorSupplier.getRandomColor());
     }
 }