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Free Coupon Code Java Generics - Practice Questions 2026 100% OFF
Free Coupon Code Java Generics - Practice Questions 2026 100% OFF

Udemy Free coupon code for Java Generics - Practice Questions 2026 course taught by Jitendra Suryavanshi, which has 465 students and is rated 0.0 out of 0 votes. This course is about in English and was updated on January 10, 2026. You can use this Udemy course with a free certificate and find the coupon at the bottom of this page.

Java Generics 120 unique high-quality test questions with detailed explanations!

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Platform: Udemy

Instructor: Jitendra Suryavanshi

Language: English

Duration: 00:00:00

Student(s): 465

Rate 0 Of 5 From 0 Votes

Expires on: 2026/01/14

Last Update: 2026/01/10

Promoted by: Anonymous

Master the complexities of Java Generics with this comprehensive practice exam course. Designed for developers who want to move beyond basic syntax and truly understand Type Safety, Polymorphism, and the nuances of the Java Collections Framework, this course provides a rigorous testing environment.

Why Serious Learners Choose These Practice Exams

Serious learners understand that watching a video is not the same as writing bug-free code. These practice exams are crafted to challenge your understanding of how the Java compiler handles generic types at compile-time and runtime. By engaging with these questions, you bridge the gap between theoretical knowledge and professional-level implementation. We focus on common pitfalls, edge cases, and the "why" behind every compilation error.

Course Structure

Our curriculum is organized into a progressive learning path to ensure you build a solid foundation before tackling complex logic.

  • Basics / Foundations: This section focuses on the fundamental "Why" of Generics. You will be tested on type safety, the removal of explicit casting, and the basic syntax of generic classes and methods.

  • Core Concepts: Here, we dive into Type Parameters and Type Erasure. You will explore how the JVM handles types and what happens to your generic code after compilation.

  • Intermediate Concepts: This module covers Bounded Type Parameters. You will practice using the extends keyword to restrict the types that can be passed to a generic class or method.

  • Advanced Concepts: This challenging section focuses on Wildcards. You will master Upper Bounded Wildcards, Lower Bounded Wildcards, and Unbounded Wildcards, learning exactly when to use ? extends T versus ? super T.

  • Real-world Scenarios: These questions simulate actual production code. You will deal with generic interfaces, legacy code integration, and complex data structures.

  • Mixed Revision / Final Test: A comprehensive cumulative exam that mixes all previous topics to ensure you are ready for technical interviews or professional certification.

Sample Practice Questions

Question 1

Which of the following code snippets will cause a compilation error?

  • Option 1: List list = new ArrayList();

  • Option 2: List list = new ArrayList();

  • Option 3: List list = new ArrayList();

  • Option 4: List list = new ArrayList();

  • Option 5: List list = new ArrayList<>();

    • Correct Answer: Option 1

    Correct Answer Explanation:

    In Java Generics, subtyping of the type arguments does not mean subtyping of the generic types. While String is a subtype of Object, List is not a subtype of List. This is known as invariance. If this were allowed, you could potentially add an Integer into a List that was actually a List, breaking type safety.

    Wrong Answers Explanation:

    • Option 2: This is valid because the unbounded wildcard is the supertype of all specialized versions of the list.

    • Option 3: This is valid. Integer is a subtype of Number, so the Upper Bounded Wildcard accepts it.

    • Option 4: This is valid. Number is a supertype of Integer, so the Lower Bounded Wildcard accepts it.

    • Option 5: This is valid. It uses the "diamond operator" introduced in Java 7, where the compiler infers the type.

    Question 2

    Given the principle of PECS (Producer Extends, Consumer Super), which declaration is most appropriate for a method that only reads data from a source list of numbers?