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Java Basics and Syntax practice questions

Practise Oracle Java Foundations 1Z0-811 Java Basics and Syntax 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: Java Basics and Syntax
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What the exam tests

What to know about Java Basics and Syntax

Java Basics and Syntax 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 Java Basics and Syntax 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

Java Basics and Syntax questions

20 questions · select your answer, then reveal the explanation

Question 1hardmultiple choice
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Which code snippets correctly create a two-dimensional array with 3 rows and 4 columns? (Select all that apply)

Question 2hardmulti select
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Which FOUR statements about the main method are correct? (Choose four.)

Question 3easymultiple choice
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A developer needs to declare a constant for the value of PI (3.14159) in a class. Which declaration follows Java best practices?

Question 4hardmulti select
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Which THREE are valid Java identifiers? (Choose three.)

Question 5mediummultiple choice
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A class has two methods: void setValue(int a) and void setValue(double a). Which call will result in a compilation error?

Question 6hardmultiple choice
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You are tasked with debugging a Java application that processes temperature sensor readings. The application reads an array of double values representing temperatures in Celsius, and should output the number of readings that exceed a threshold of 30.0°C. The current implementation is:

public class TemperatureAnalyzer {
    public static void main(String[] args) {

double[] readings = {25.5, 32.1, 30.0, 28.9, 35.7};

int count = 0;
        for (int i = 0; i < readings.length; i++) {
            if (readings[i] > 30.0) {

count++;

}
        }

System.out.println("Count: " + count);

}
}

However, the output is "Count: 3" instead of the expected 2 (since 30.0 is not above the threshold). The developer believes the issue is that the condition should be '>=' to include 30.0, but the specification says strictly above 30.0. After further investigation, you discover that the problem is due to floating-point imprecision when comparing with the literal 30.0. Which of the following changes would correctly fix the comparison to reliably count readings strictly greater than 30.0, considering floating-point representation?

Question 7hardmultiple choice
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A developer is building a Java application for a bank that processes account transactions. The application reads transaction amounts from a CSV file provided by a third party. The amounts are in string format, e.g., '1,234.56' or '$5,000.00'. The developer uses Integer.parseInt() to convert these strings to integers for processing. However, many transactions fail with NumberFormatException. The developer adds a try-catch block to catch the exception and log the error. But still, the application fails to process valid transactions because the parsing does not handle the formatting. The development team is considering several approaches to fix this issue. The goal is to parse the string into an integer representing the whole dollar amount (ignoring cents and formatting). Which course of action should the developer take?

Question 8easymultiple choice
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A developer writes the following code: int x = 5; System.out.println(x++); What is the output?

Question 9mediummultiple choice
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A team decides to use a single Java source file for a small application. Which statement is true about the file structure?

Question 10hardmultiple choice
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Given the code: String s1 = "Java"; String s2 = new String("Java"); if (s1 == s2) { System.out.print("Equal"); } else { System.out.print("Not Equal"); } What is the output?

Question 11easymultiple choice
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Which primitive data type should be used to store a single character?

Question 12mediummultiple choice
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A method is declared as: public static void main(String[] args) { }. Which statement is true?

Question 13easymultiple choice
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What is the value of the expression (10 > 5) && (3 < 2)?

Question 14mediummultiple choice
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Which loop construct guarantees that the body executes at least once?

Question 15hardmultiple choice
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Given the code: int[] arr = {1,2,3}; for(int x : arr) { if(x==2) continue; System.out.print(x); } What is the output?

Question 16mediummultiple choice
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Which access modifier makes a member visible only within its own class?

Question 17easymultiple choice
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What is the result of the expression 10 % 3?

Question 18mediummulti select
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Which TWO are valid identifiers in Java? (Choose two.)

Question 19hardmulti select
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Which THREE are valid ways to declare and initialize an integer variable in Java? (Choose three.)

Question 20easymulti select
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Which TWO keywords are used for decision-making in Java? (Choose two.)

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Frequently asked questions

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