Master Java from core fundamentals to Java 21 — OOP, collections, streams, concurrency, JVM internals, and everything asked in backend interviews.
4 courses available
OOP, collections, generics, exceptions — the complete Java foundation every backend interview tests.
Threads, executors, locks, volatile, and the Java memory model — the hardest Java interview topic made clear.
Lambdas, streams, optionals, method references — write modern Java and answer every functional-style interview question.
Virtual threads, records, sealed classes, pattern matching — everything new in Java 17–21 that interviewers now ask about.
