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.

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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 ...

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.