question on the working of instanceof
instanceof, java
Solution
This has nothing to do with `instanceof`. The method `Long.getLong()` does not parse the string, it returns the contents of a system property with that name, interpreted as long. Since there is no system property with the name 23, it returns null. You want `Long.parseLong()`
Problem
``` Long l1 = null; Long l2 = Long.getLong("23"); Long l3 = Long.valueOf(23); System.out.println(l1 instanceof Long); // returns false System.out.println(l2 instanceof Long); // returns false System.out.println(l3 instanceof Long); // returns true ``` I could not understand the output returned. I was expecting true atleast for 2nd and 3rd syso's. Can someone explain how instanceof works?