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1Z0-811 · topic practice

Primitives, Strings and Operators practice questions

Practise Oracle Java Foundations 1Z0-811 Primitives, Strings and Operators 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
18 questionsDomain: Primitives, Strings and Operators
Practice 10 questionsBrowse domain →

What the exam tests

What to know about Primitives, Strings and Operators

Primitives, Strings and Operators 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 Primitives, Strings and Operators 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

Primitives, Strings and Operators questions

18 questions · select your answer, then reveal the explanation

Question 1easymultiple choice
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Given the code snippet: int x = 5; int y = 2; double result = x / y; What is the value of result?

Question 2mediummultiple choice
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A developer writes: String s = "Hello"; s.concat(" World"); System.out.println(s); What is the output?

Question 3hardmultiple choice
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Given: String str = "Java"; str = str.concat(" SE"); str.replace('a', 'A'); System.out.println(str); What is the output?

Question 4mediummultiple choice
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Which operator is used to compare two strings for value equality in Java?

Question 5easymultiple choice
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What is the result of: System.out.println(10 + 20 + "30");

Question 6hardmultiple choice
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Given: boolean a = false; boolean b = true; boolean c = true; System.out.println(a || b && c); What is the output?

Question 7mediummultiple choice
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Which of the following is a valid Java identifier?

Question 8easymultiple choice
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What is the output of: int i = 1; i = i++; System.out.println(i);

Question 9mediummultiple choice
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Which primitive type can store a single character?

Question 10hardmultiple choice
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Given: double d = 5.0; int i = d; What is the result?

Question 11easymultiple choice
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What is the default value of a boolean variable in Java?

Question 12mediummulti select
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Which TWO of the following are valid ways to create a String?

Question 13hardmulti select
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Which THREE of the following are valid Java operators?

Question 14easymulti select
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Which TWO of the following are primitive data types in Java?

Question 15mediummulti select
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Which THREE of the following expressions evaluate to true? (Assume int a=5, b=10)

Question 16hardmultiple choice
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What is the value of y?

Exhibit

Refer to the exhibit.

public class Test {
    public static void main(String[] args) {
        int x = 10;
        int y = x++ + ++x;
        System.out.println(y);
    }
}
Question 17hardmultiple choice
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A developer is working on a Java application that processes user input. The application reads a string from the console and needs to compare it with a predefined constant string "ADMIN". The developer writes the following code: if (input == "ADMIN") { grantAccess(); }. During testing, the condition sometimes fails even when the user enters ADMIN. The input string is obtained via Scanner.nextLine(). Which is the most likely cause and best fix?

Question 18mediummultiple choice
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A banking application uses a method to calculate interest: double calculateInterest(double balance) { return balance * 0.05; }. The method is called with an int argument: int accountBalance = 1000; double interest = calculateInterest(accountBalance); System.out.println(interest); The output is 50.0, but the expected output is 50.0. However, the developer notices that if the method is changed to return int, the output becomes 50.0 as well. Which statement about implicit casting is true?

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Frequently asked questions

What does the 1Z0-811 exam test about Primitives, Strings and Operators?
Primitives, Strings and Operators 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 Primitives, Strings and Operators questions in a focused session?
Yes — the session launcher on this page draws every question from the Primitives, Strings and Operators 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.