add tasks starting with a number

Task/100-doors/Java/100-doors-3.java

@@ -0,0 +1,12 @@
+public class Doors
+{
+ public static void main(final String[] args)
+ {
+  StringBuilder sb = new StringBuilder();
+
+  for (int i = 1; i <= 10; i++)
+   sb.append("Door #").append(i*i).append(" is open\n");
+
+  System.out.println(sb.toString());
+ }
+}