222 lessons

Java Lessons

Learn Java through a full language tutorial, then branch into Spring Framework, JUnit, Mockito, Jackson, Guava and more.

Java Tutorial

Code preview

java

record User(String name) {}

var names = users.stream()
    .map(User::name)
    .toList();

●[Ada, Grace]

222 lessons across 11 sections. Each example shows real, runnable code with its expected output.

Topics covered

Classes and methodsCollectionsExceptionsStreams