Closing scanners.

DataStructures/Graphs/BellmanFord.java

@@ -100,6 +100,7 @@ start vertex, end vertes and weights. Vertices should be labelled with a number
                 System.out.println();
             }
         }
+        sc.close();
     }
     /**
      * @param source Starting vertex

DataStructures/HashMap/Hashing/Main.java

@@ -42,6 +42,7 @@ public class Main {
 					return;
 				}	
 			}
+			In.close();
 		}
 	}
 }

DataStructures/Trees/RedBlackBST.java

@@ -309,6 +309,7 @@ public class RedBlackBST {
             printTreepre(root);
             break;
         }
+        scan.close();
     }
 
     public void deleteDemo() {