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 (50)
✍️ Sample SCJP Questions & Answers
1. What is the default value of an instance variable of type boolean in Java?
The default value for an instance boolean variable is false in Java.
2. 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()`.
3. 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.
4. 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.
5. 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`.
6. Which keyword is used to prevent method overriding in Java?
Declaring a method as 'final' prevents it from being overridden in any subclass.