Downloading sources for maven and sbt project dependencies
Command-line options for downloading sources for dependencies in maven and sbt.
Java
Using StringReader to iterate over a String
Iterate over a String character by character.
Creating singleton collections
Collections class provides static methods for immutable singleton collections (List, Map, Set).
Creating unmodifiable & synchronized collections
By default, the classes available in the Java Collections framework are read/write enabled & not thread safe. Sometimes the requirement is to have a read only i.e. unmodifiable collection. The Collections class available in the java.util package provides utility methods to create such collections. Note: Do not confuse this class with the Collection interface which is the root interface of the collection hierarchy. The objects returned by these methods are wrappers over the original collection object you supply to the method (Decorator design pattern)....
Implementing equals(), hashCode(), toString() & compareTo() using reflection
Apache Commons Lang simplifies method implementation (equals(), hashCode(), etc.) with reflection, albeit with slower performance compared to explicit field usage.