Covenant University

COS 221

Practice 312+ past questions for COS 221 at Covenant University. Organized by topic with explanations. Free preview on Testwiz.

312+ questions40 topics200 LevelTheory questions

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About COS 221 at Covenant University

COS 221 is a 200 Level course at Covenant University. Students preparing for COS 221 exams on Testwiz get 312+ practice questions across 40 topics, including theory questions.

Instead of cramming the night before, students who practice by topic — Java Exception Hierarchy and Handling, Inheritance and Polymorphism in Java, Object-Oriented Programming Concepts, and more — build real familiarity with how Covenant University tests COS 221, catch weak spots early with Testwiz's analytics, and walk into the exam with actual reps under their belt.

Topics covered

Java Exception Hierarchy and HandlingInheritance and Polymorphism in JavaObject-Oriented Programming ConceptsControl Flow and Loop StatementsArrays and String ProcessingFile I/O and Exception ManagementData Types, Operators, and ExpressionsMethods: Definition and UsageJavaFX GUI Programming BasicsJava Program Structure and SetupIntroduction to Java and Problem SolvingJava Overview and History+28 more

Sample questions

1. Which of the following statements about Java exception handling is TRUE?

a.Multiple catch blocks are not allowed for a single try block.

b.A try block must be followed by either a catch or a finally block.

c.The finally block executes only if an exception is caught.

d.The throw keyword is used to declare exceptions that a method can throw.

2. A developer writes a method that reads a file and wants to ensure the file stream is closed even if an exception occurs. Which construct should be used?

a.A catch block that rethrows the exception

b.A throws clause in the method signature

c.A finally block after the try-catch

d.A custom exception class

3. Which of the following is NOT a type of inheritance supported by Java?

a.Multiple inheritance through classes

b.Hierarchical inheritance

c.Single inheritance

d.Multilevel inheritance

4. In Java, the process by which a subclass provides a specific implementation of a method that is already defined in its superclass is BEST described as:

a.Method overloading

b.Method overriding

c.Method abstraction

d.Method encapsulation

5. Which of the following is the PRIMARY purpose of encapsulation in object-oriented programming?

a.To define a common interface for a group of related classes

b.To hide internal data and protect it from direct access

c.To allow a class to inherit features from another class

d.To enable a method to perform different tasks based on input

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Frequently asked questions

How many COS 221 past questions are on Testwiz?

Testwiz has 312+ COS 221 practice questions for Covenant University, organized across 40 topics, including theory questions. Sign up free to start practicing.

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Yes, every student gets a free preview of COS 221 questions on Testwiz. The full question bank, explanations, and weak-spot analytics are available on Pro.

What topics does COS 221 cover on Testwiz?

COS 221 on Testwiz covers Java Exception Hierarchy and Handling, Inheritance and Polymorphism in Java, Object-Oriented Programming Concepts, and more. Practice on Testwiz to see the full topic breakdown and sample questions.