implement lottery ball generation logic

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

@@ -1,7 +1,18 @@
 package core.basesyntax;
 
 public class Application {
+    private static final int BALL_COUNT = 3;
+
     public static void main(String[] args) {
-        // create three balls using class Lottery and print information about them in console
+        Lottery lottery = new Lottery();
+        Ball[] balls = new Ball[BALL_COUNT];
+
+        for (int i = 0; i < balls.length; i++) {
+            balls[i] = lottery.getRandomBall();
+        }
+
+        for (Ball ball: balls) {
+            System.out.println(ball.toString());
+        }
     }
 }

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

@@ -0,0 +1,17 @@
+package core.basesyntax;
+
+public class Ball {
+    private final Color color;
+    private final int number;
+
+    public Ball(Color color, int number) {
+        this.color = color;
+        this.number = number;
+    }
+
+    @Override
+    public String toString() {
+        return this.color.name() + " " + "ball" + " "
+                + "with number" + " " + this.number;
+    }
+}

src/main/java/core/basesyntax/Color.java

@@ -0,0 +1,9 @@
+package core.basesyntax;
+
+public enum Color {
+    RED,
+    BLUE,
+    GREEN,
+    WHITE,
+    BLACK
+}

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

@@ -1,7 +1,11 @@
 package core.basesyntax;
 
+import java.util.Random;
+
 public class ColorSupplier {
-    public String getRandomColor() {
-        return null;
+    private final Random random = new Random();
+
+    public Color getRandomColor() {
+        return Color.values()[this.random.nextInt(Color.values().length)];
     }
 }

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

@@ -0,0 +1,17 @@
+package core.basesyntax;
+
+import java.util.Random;
+
+public class Lottery {
+    private static final int MAX_BALL_NUMBER = 100;
+
+    private final Random random = new Random();
+    private final ColorSupplier colorSupplier = new ColorSupplier();
+
+    public Ball getRandomBall() {
+        return new Ball(
+            this.colorSupplier.getRandomColor(),
+            this.random.nextInt(MAX_BALL_NUMBER) + 1
+        );
+    }
+}