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1Z0-811 · topic practice

What is Java practice questions

Practise Oracle Java Foundations 1Z0-811 What is Java practice questions — original exam-style scenarios with answer choices, explanations, and analysis of common mistakes.

Courseiva uses original exam-style practice questions designed for learning and revision. The goal is to understand the concepts, recognise exam patterns, and improve through explanations — not memorise copied exam dumps.

Reviewed byJohnson Ajibi· MSc IT Security
20 questionsDomain: What is Java
Practice 10 questionsBrowse domain →

What the exam tests

What to know about What is Java

What is Java questions test whether you can apply the concept in context, not just recognise a definition.

How the topic appears in realistic exam-style scenarios.

Which detail in the question changes the correct answer.

How to eliminate plausible but wrong options.

How to connect the question back to the wider exam objective.

Watch out for

Common What is Java exam traps

  • ▸Answering from memory before reading the full scenario.
  • ▸Missing a constraint such as cost, availability, security, scope or command context.
  • ▸Choosing a broad answer when the question asks for the most specific fix.
  • ▸Ignoring why the wrong options are tempting.

Practice set

What is Java questions

20 questions · select your answer, then reveal the explanation

Question 1mediummultiple choice
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A developer is writing a Java application that processes a large number of transactions. The application must ensure that each transaction is committed only if all steps complete successfully, otherwise the entire transaction should be rolled back. Which Java concept should the developer use to implement this requirement?

Question 2easymultiple choice
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A team is designing a Java application that needs to run on different operating systems without modification. Which Java feature makes this possible?

Question 3hardmulti select
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Which TWO statements correctly describe the Java language? (Choose two.)

Question 4mediummultiple choice
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A developer runs the command shown in the exhibit. The developer wants to ensure the application uses the latest available language features. Which action should the developer take?

Exhibit

Refer to the exhibit.
```
$ java -version
java version "1.8.0_201"
Java(TM) SE Runtime Environment (build 1.8.0_201-b09)
Java HotSpot(TM) 64-Bit Server VM (build 25.201-b09, mixed mode)
```
Question 5hardmultiple choice
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A company is developing a Java-based inventory management system. The system runs on a single server and processes up to 1000 concurrent requests. The development team has implemented the code using multiple threads to handle requests. Recently, the system has been experiencing intermittent data corruption in the inventory counts. After reviewing the code, the team suspects that the issue is related to thread safety. The team is considering the following solutions: (A) Use the 'synchronized' keyword on all methods that update inventory counts. (B) Use 'volatile' keyword on the inventory count variables. (C) Use 'AtomicInteger' for inventory counts. (D) Increase the number of threads to handle requests faster. Which solution should the team implement to fix the data corruption issue with minimal performance impact?

Question 6mediumdrag order
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Arrange the steps to compile and run a Java program from the command line in the correct order.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5
Question 7mediumdrag order
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Arrange the steps to overload a method in Java in the correct order.

Drag steps to the numbered slots on the right, or tap a step then tap a slot.

Steps
Order
1Step 1
2Step 2
3Step 3
4Step 4
5Step 5
Question 8mediummatching
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Match each Java term to its correct definition.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Java Virtual Machine that executes bytecode

Runtime environment including JVM and core libraries

Development kit including JRE and tools like javac

Just-In-Time compiler that optimizes bytecode at runtime

Garbage Collector that automatically manages memory

Question 9mediummatching
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Match each OOP concept to its Java implementation.

Drag a concept onto its matching description — or click a concept then click the description.

Concepts
Matches

Using private fields with public getters/setters

Using extends keyword to derive a class

Method overriding and overloading

Using abstract classes and interfaces

Using fields that reference other objects

Question 10easymultiple choice
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A developer says Java is platform-independent because of the JVM. Which statement best explains this?

Question 11mediummultiple choice
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A company is developing a security-sensitive banking application. Which Java feature most directly enhances security?

Question 12hardmultiple choice
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A team deploys a Java application and observes frequent Full GC pauses. Which garbage collector is designed to minimize pause times?

Question 13easymultiple choice
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What is the primary role of the Java Development Kit (JDK) compared to the JRE?

Question 14mediummultiple choice
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An application is designed with private fields and public getter/setter methods. Which OOP principle does this exemplify?

Question 15hardmultiple choice
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In the Java memory model, where are primitive local variables declared inside a method stored?

Question 16easymultiple choice
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What is the primary purpose of Java bytecode?

Question 17mediummultiple choice
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During execution, the JVM uses Just-In-Time (JIT) compilation. What is its primary benefit?

Question 18hardmultiple choice
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A company wants to run existing Java SE application code on an embedded device with limited resources. Which Java edition is designed for such environments?

Question 19easymulti select
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Which TWO statements are true about the Java programming language?

Question 20mediummulti select
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Which THREE are valid components of the Java Virtual Machine (JVM)?

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1Z0-811 scenario practice questions

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1Z0-811 troubleshooting practice questions

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Frequently asked questions

What does the 1Z0-811 exam test about What is Java?
What is Java questions test whether you can apply the concept in context, not just recognise a definition.
How should I use these practice questions?
Select your answer before revealing the explanation. Then read why each option is right or wrong — this active recall approach builds retention far faster than re-reading notes.
Can I practise just What is Java questions in a focused session?
Yes — the session launcher on this page draws every question from the What is Java domain. Use a 10-question session first to gauge your baseline, then move to 20 or 30 once the weak spots are clear.
Where can I practise other 1Z0-811 topics?
Use the topic links above to move to related areas, or go back to the 1Z0-811 question bank to see all topics.
Are these real exam questions or dumps?
These are original practice questions written to test the same concepts the 1Z0-811 exam covers. They are not copied from any real exam or dump site.