Sorting is common functionality required by many applications. Questions like: How do we sort in Java? or What should we use as sorting algorithm? need to answered before we can perform any kind of ...

05-14 11:30:54.272 29119 18266 E AndroidRuntime: java.lang.NullPointerException: Attempt to invoke interface method 'int java.lang.Comparable.compareTo(java.lang.Object)' on a null object reference ...