Java Collections & Generics

Java Collections are difficult to learn, but once you understand them, they can provide you very powerful functions.

Java Collections

• Collections Hierarchy Diagram
• Summary table
• Set: HashSet vs. TreeSet vs. LinkedHashSet
• List: ArrayList vs. LinkedList vs. Vector
• Map: HashMap vs. TreeMap vs. Hashtable vs. LinkedHashMap
• More examples
  • Set for unique data
  • TreeSet
  • Implement Comparable for a TreeSet
  • PriorityQueue
  • Sorting arrays
  • Convert Hashtable to Hashmap

Generics

• Why do we need generic types in Java?
• 3 examples to explain common mistakes when using Java Generics
  • 1). Example of a common mistake
  • 2). Yet another tricky problem
  • 3). Two more problems from SCJP

There are more Java API Examples from programcreek.