StudyToCert

All certifications / OCP Java / Lessons

Oracle Certified Professional: Java SE Developer 1Z0-831 (Java SE 25) · Domain 6: Working with streams and lambda expressions

Terminal operations: forEach, reduce, collect, count, findFirst, anyMatch, toList

▶ Watch the overview video

Last reviewed September 25, 2026 · Leer en español

A terminal operation ends a pipeline, triggers the processing and produces a result or a side effect. After it runs the stream is consumed. Knowing each operation's return type is essential, because exam code often assigns the result to a variable of the wrong type.

Free account

Keep reading for free

Create a free StudyToCert account to read the rest of this lesson: 5 more sections, 5 key terms, a real-world example, an exam tip and self-check questions. Every lesson, lab and practice test is free with an account.

Sign up free Log in

Study OCP Java for free
A week-by-week plan with every lesson, quizzes, checkpoint tests, a practice exam and hands-on labs.
Open the OCP Java study plan