apply solution

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

@@ -0,0 +1,23 @@
+package core.basesyntax;
+
+public class Ball {
+
+    private String color;
+    private int number;
+
+    public Ball(String color, int number) {
+        this.color = color;
+        this.number = number;
+    }
+
+    @Override
+    public String toString() {
+        return "Ball{"
+                +
+                "color=" + color
+                +
+                ", number=" + number
+                +
+                '}';
+    }
+}

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

@@ -0,0 +1,7 @@
+package core.basesyntax;
+
+public enum Color {
+    RED,
+    GREEN,
+    BLUE
+}

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

@@ -1,7 +1,10 @@
 package core.basesyntax;
 
+import java.util.Random;
+
 public class ColorSupplier {
+
     public String getRandomColor() {
-        return null;
+        return Color.values()[new Random().nextInt(0, Color.values().length)].name();
     }
 }

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

@@ -0,0 +1,10 @@
+package core.basesyntax;
+
+import java.util.Random;
+
+public class Lottery {
+
+    public Ball getRandomBall() {
+        return new Ball(new ColorSupplier().getRandomColor(), new Random().nextInt(0, 100));
+    }
+}