add tasks starting with a number

Task/100-doors/Java/100-doors-1.java

@@ -0,0 +1,13 @@
+public class HundredDoors {
+    public static void main(String[] args) {
+        boolean[] doors = new boolean[101];
+        for (int i = 1; i <= 100; i++) {
+            for (int j = i; j <= 100; j++) {
+                if(j % i == 0) doors[j] = !doors[j];
+            }
+        }
+        for (int i = 1; i <= 100; i++) {
+            System.out.printf("Door %d: %s%n", i, doors[i] ? "open" : "closed");
+        }
+    }
+}