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Java’s collections like arrays and lists are foundational building blocks. Functional programming techniques are at times the ideal way to work with these collections.

Do you need to know how to sort Java objects in a collection, array, or map? Here's how to use the Comparable and Comparator interfaces and avoid ClassCastExceptions.

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 ...