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1Z0-811 · topic practice

Object-Oriented Programming practice questions

Practise RAM questions covering identification, installation, speeds, dual-channel, and troubleshooting for the 1Z0-811 exam.

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: Object-Oriented Programming
Practice 10 questionsBrowse domain →

What the exam tests

What to know about Object-Oriented Programming

RAM tests your ability to identify, install, and troubleshoot memory types, speeds, and configurations for PCs.

Identifying DDR3 vs DDR4 vs DDR5 physical and electrical differences

Matching RAM speed (MHz) to motherboard and CPU support

Calculating total memory capacity from module size and slots

Troubleshooting common RAM errors like beep codes and blue screens

Why learners struggle

Why Object-Oriented Programming questions are commonly missed

RAM questions are commonly missed because learners confuse physical form factors (DIMM vs SO-DIMM) and fail to distinguish between memory speed (MHz) and latency (CL).

  • ·DIMM vs SO-DIMM — desktop vs laptop form factor confusion
  • ·DDR3 vs DDR4 vs DDR5 — notch position and voltage differences
  • ·MHz vs CL — speed vs latency trade-offs in performance
  • ·Single-channel vs dual-channel — bandwidth impact misconception
  • ·ECC vs non-ECC — error correction support in servers vs desktops
  • ·32-bit vs 64-bit — maximum addressable RAM limit

Watch out for

Common Object-Oriented Programming exam traps

  • ▸Confusing DDR3 and DDR4 notch positions and voltage requirements
  • ▸Assuming dual-channel requires identical size modules only
  • ▸Mixing ECC and non-ECC RAM in a single system
  • ▸Forgetting that 32-bit OS limits usable RAM to 4 GB

Practice set

Object-Oriented Programming questions

20 questions · select your answer, then reveal the explanation

Question 1mediummultiple choice
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A developer writes a class 'Vehicle' with a method 'move()' that prints 'Vehicle moves'. A subclass 'Car' overrides 'move()' to print 'Car moves'. Given: Vehicle v = new Car(); v.move(); What is the output?

Question 2easymultiple choice
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In a banking application, a class 'Account' has a private field 'balance'. Which is the best way to allow subclasses to read but not directly modify 'balance'?

Question 3hardmultiple choice
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A class 'Base' has a method 'public void display() throws IOException'. Subclass 'Derived' overrides display(). Which exception specifications are allowed in the overriding method?

Question 4mediummultiple choice
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Which design principle is violated by making all fields public in a class?

Question 5hardmultiple choice
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Given: abstract class Shape { abstract void draw(); } class Circle extends Shape { void draw() {} } Which is true?

Question 6easymultiple choice
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Which is the correct way to call a superclass constructor from a subclass constructor?

Question 7mediummultiple choice
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A developer wants to prevent a method from being overridden. Which modifier should be used?

Question 8hardmulti select
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Which TWO statements are true about interfaces in Java?

Question 9mediummulti select
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Which THREE are benefits of using inheritance?

Question 10easymultiple choice
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What is the output of: System.out.println(new Manager("Alice", 5).getName());

Exhibit

Refer to the exhibit.
public class Employee {
    private String name;
    public Employee(String name) { this.name = name; }
    public String getName() { return name; }
}
public class Manager extends Employee {
    private int teamSize;
    public Manager(String name, int teamSize) {
        super(name);
        this.teamSize = teamSize;
    }
}
Question 11hardmultiple choice
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What is the result of: new Document().print();

Exhibit

Refer to the exhibit.
interface Printable {
    default void print() { System.out.println("Printable"); }
}
interface Showable {
    default void print() { System.out.println("Showable"); }
}
class Document implements Printable, Showable {
    // no override
}
Question 12mediummultiple choice
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A development team is building a library management system. The system has classes 'LibraryItem', 'Book', and 'DVD'. LibraryItem has a method 'getTitle()' that returns the title. Book and DVD extend LibraryItem. The team wants to ensure that when a LibraryItem is borrowed, a message specific to its type is displayed. They have a 'Borrower' class with a method 'borrow(LibraryItem item)', which currently calls 'item.getTitle()' and prints the title. Now they need to display 'Book borrowed' or 'DVD borrowed' based on the actual item type. They want to avoid using 'instanceof' checks in the 'borrow' method to keep it open for new item types. Which design should they use?

Question 13mediumdrag order
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Arrange the steps to implement an interface in a Java class 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 14mediummatching
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Match each Java exception class to its category.

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

Concepts
Matches

Runtime exception (unchecked)

Checked exception

Runtime exception (unchecked)

Checked exception

Runtime exception (unchecked)

Question 15mediummultiple choice
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A company is developing a configuration manager that must be shared across all components to ensure consistent settings. The manager should prevent direct instantiation and provide a single access point. Which design pattern and implementation should be used?

Question 16easymultiple choice
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A junior developer writes a method that attempts to modify a String: public void update() { String s = "Hello"; s.concat(" World"); System.out.println(s); } What will be printed when update() is called?

Question 17hardmultiple choice
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A banking application has a base class 'Account' with a method 'withdraw()' marked as final. A subclass 'SavingsAccount' tries to override 'withdraw()'. What is the outcome?

Question 18mediummultiple choice
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A company's HR system uses an Employee class with sensitive salary information. The team wants to allow other classes to read the salary but not modify it. Which approach best preserves encapsulation?

Question 19hardmultiple choice
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A developer creates an interface 'Drawable' with a single abstract method 'draw()'. They then create a class 'Circle' that implements Drawable but forgets to provide the draw() method. Circle is not declared abstract. What will happen when compiling Circle?

Question 20easymultiple choice
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A security-sensitive class should not be extended by any other class. Which modifier should be applied to the class declaration?

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Frequently asked questions

What does the 1Z0-811 exam test about Object-Oriented Programming?
RAM tests your ability to identify, install, and troubleshoot memory types, speeds, and configurations for PCs.
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 Object-Oriented Programming questions in a focused session?
Yes — the session launcher on this page draws every question from the Object-Oriented Programming 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.