Final solution.

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

@@ -3,5 +3,11 @@
 public class Application {
     public static void main(String[] args) {
         // create three balls using class Lottery and print information about them in console
+      Ball[] ballArray = new Ball[3];
+      Lottery lottery = new Lottery();
+      for (int i = 0; i < 3; i++) {
+        ballArray[i] = lottery.getRandomBall();
+        System.out.println(ballArray[i]);
+      }
     }
 }

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

@@ -0,0 +1,27 @@
+package core.basesyntax;
+
+public class Ball {
+  private Color color;
+  private int number;
+
+  public Color getColor() {
+    return color;
+  }
+
+  public void setColor(Color color) {
+    this.color = color;
+  }
+
+  public int getNumber() {
+    return number;
+  }
+
+  public void setNumber(int number) {
+    this.number = number;
+  }
+
+  @Override
+  public String toString() {
+    return this.color + " " + this.number;
+  }
+}

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

@@ -0,0 +1,12 @@
+package core.basesyntax;
+
+public enum Color {
+  RED,
+  WHITE,
+  BLUE,
+  ORANGE,
+  GREEN,
+  BLACK,
+  GOLD,
+  SILVER
+}

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;
+    public Color getRandomColor() {
+      Random randomColor = new Random();
+      int index = randomColor.nextInt(Color.values().length);
+      return Color.values()[index];
     }
 }

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

@@ -0,0 +1,15 @@
+package core.basesyntax;
+
+import java.util.Random;
+
+public class Lottery {
+  public Ball getRandomBall() {
+    Random randomNumber = new Random();
+    Ball ball = new Ball();
+    ColorSupplier randomColor = new ColorSupplier();
+    ball.setColor(randomColor.getRandomColor());
+    ball.setNumber(randomNumber.nextInt(101));
+
+    return ball;
+  }
+}