Tag: Tutorial

Store unique unordered elements with HashSet.

Keep unique elements sorted with TreeSet.

Map keys to values with HashMap for fast lookups.

Store sorted key/value pairs with TreeMap.

Traverse collections safely with Iterator and enhanced for-loops.

Write type-safe classes and methods with generics.

Use Integer, Double, Boolean, and other wrappers for primitives in collections.

Organize classes into packages and import what you need.

Handle runtime failures with exceptions instead of ignoring errors.

Use finally for cleanup that must run after try/catch.