Advanced Java

Theory

Advanced Java features enable writing more expressive, efficient, and robust code. The Collections Framework, exception handling, streams, and lambdas are essential tools.

Collections Framework

Java provides a rich set of collection interfaces and implementations:

• List — Ordered, allows duplicates (ArrayList, LinkedList)
• Set — No duplicates (HashSet, TreeSet)
• Map — Key-value pairs (HashMap, TreeMap)
• Queue — FIFO processing (LinkedList, PriorityQueue)

List<String> names = new ArrayList<>();
names.add("Alice");
names.add("Bob");
 
Map<String, Integer> ages = new HashMap<>();
ages.put("Alice", 25);

Exception Handling

Exceptions disrupt normal program flow. Use try/catch/finally to handle them gracefully:

try {
    int result = 10 / 0;
} catch (ArithmeticException e) {
    System.out.println("Cannot divide by zero");
} finally {
    System.out.println("This always runs");
}

Streams and Lambdas

Lambdas provide a concise way to express functional interfaces. Streams process sequences of data declaratively:

Why this matters

Collections, streams, and lambdas are essential for writing modern, expressive Java code. These features let you process data efficiently, handle errors gracefully, and build robust enterprise applications.

What's next

In the next lessons, you'll dive deeper into each topic with hands-on examples and exercises.

Exercises

[ALICE, CHRISTOPHER]

Mini Quiz