SCJP Study Guide 2026
Everything you need to pass the SCJP exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 SCJP Exam Format at a Glance
📚 SCJP Topics to Study (31)
✍️ Sample SCJP Questions & Answers
1. What is the difference between `Iterator` and `ListIterator` in Java?
`ListIterator` extends `Iterator` with the ability to traverse a list in both forward and backward directions and also supports `add()` and `set()`.
2. What is a race condition in Java concurrency?
A race condition occurs when the program's outcome depends on the non-deterministic ordering of unsynchronized thread operations.
3. Which class should be used to format a number as currency for a specific locale in Java?
`NumberFormat.getCurrencyInstance(Locale)` returns a NumberFormat preconfigured for the currency of the given locale. While DecimalFormat can approximate it, the standard SCJP answer is `NumberFormat.getCurrencyInstance()`. java.util.Currency represents a currency but doesn't format numbers.
4. In Java, can a class implement more than one interface?
A Java class can implement multiple interfaces by listing them with commas: `class Foo implements A, B, C`.
5. Which keyword is used to prevent method overriding in Java?
Declaring a method as 'final' prevents it from being overridden in any subclass.
6. What happens when `Thread.start()` is called more than once on the same Thread object?
Once a thread has been started and has terminated, calling `start()` again on the same Thread object throws `IllegalThreadStateException`.
🎯 Free SCJP Practice Tests
📖 SCJP Guides & Articles
What Practice Test Geeks adds beyond an AI chat for SCJP
An AI chatbot can quiz you, but it can't reproduce the exam conditions or keep your record. Here you get:
- A timed, full-length SCJP mock exam — 72 questions in 210 minutes with a 65% pass mark, modeled on the official exam's question count and time limit, followed by a score report broken down by exam domain.
- A fixed SCJP question bank: the same test every attempt, so your score is comparable from one try to the next instead of changing with every regenerated quiz.
- Progress saved on your device: completed tests, scores and missed questions stay in My Progress, so you can retake only what you got wrong.
- A printable SCJP cheat sheet you can print or save as a PDF.
- SCJP flashcards built from the same question bank.
- Free SCJP practice tests with the correct answer shown after each question.
How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. We have not yet matched this exam's facts to an official source, so confirm fees, dates and rules with the exam body. Not reviewed by a subject-matter expert. Editorial policy