2 files changed, 22 insertions, 0 deletions
diff --git a/src/App.java b/src/App.java
index e1c9498..4fdb55f 100644
--- a/src/App.java
+++ b/src/App.java
@@ -38,6 +38,9 @@ public class App {
         case 8:
           Q8.BadmintonScoring.main(args);
           break;
+        case 9:
+          Q9.MovingRobot.main(args);
+          break;
         default:
           System.out.println("Bye");
           System.exit(0);
diff --git a/src/Q9/MovingRobot.java b/src/Q9/MovingRobot.java
index a7b462c..c063c14 100644
--- a/src/Q9/MovingRobot.java
+++ b/src/Q9/MovingRobot.java
@@ -53,6 +53,8 @@ public class MovingRobot extends Robot {
 
   public void move() {
     this.nextMove = generateNextMove();
+    if (!validateNextMove(this.nextMove)) this.move();
+
     this.move(this.nextMove);
   }
 
@@ -125,4 +127,21 @@ public class MovingRobot extends Robot {
   private void moveLeft() {
     this.setX(this.getX() - 1);
   }
+
+  public static void main(String[] args) {
+    System.out.println("=== Question 9 ===");
+    MovingRobot r1 = new MovingRobot(0, 0);
+    MovingRobot r2 = new MovingRobot(9, 9);
+    while (!MovingRobot.sameSlot(r1, r2)) {
+      r1.move();
+      r2.move();
+    }
+
+    System.out.println(String.format("Collision at: (%d, %d)", r1.getX(), r1.getY()));
+    System.out.println("R1 Route:");
+    System.out.println(r1.printMoves());
+
+    System.out.println("R2 Route:");
+    System.out.println(r2.printMoves());
+  }
 }