Wrapper Class | Part 2.2 | Unit 2 | Programming in Java

Publicado el: 04 marzo 2026
en el canal de: BunkToBrains

In this lecture of Programming in Java Unit 2, we study Wrapper Classes, an important concept in Java that allows primitive data types to be treated as objects. Wrapper classes play a key role in object oriented programming and are widely used in Java collections, utilities, and frameworks.

The lecture begins with the basic idea of primitive data types and the limitation that they are not objects. You will understand why Java provides wrapper classes and how they help convert primitive data into object form so that they can be used in object oriented structures.

We then discuss different wrapper classes provided in the Java language such as Integer, Float, Double, Character, Boolean, Byte, Short, and Long. Students will learn how each wrapper class corresponds to a primitive data type and how values are stored inside objects.

The lecture also explains the concept of boxing and unboxing. Manual conversion between primitive types and wrapper objects is discussed first, followed by the concept of autoboxing and auto unboxing introduced in modern versions of Java.

Important methods of wrapper classes such as parseInt(), valueOf(), toString(), and comparison methods are also explained with examples so students can clearly understand their practical use.

From an exam perspective, wrapper class definitions, differences between primitive types and wrapper objects, and concepts like autoboxing and unboxing are commonly asked in 5 mark and 10 mark questions and also appear in viva examinations.

🎯 Who Should Watch This?
• B.Tech (CSE / IT) students
• BCA students
• MCA students
• Diploma Computer Engineering students
• Students preparing for semester exams

🔥 Why Watch This Video?
✔ Simple and clear explanations
✔ Helpful for 5-mark & 10-mark questions
✔ Exam-oriented teaching approach
✔ Ideal for revision and concept strengthening

📚 Related Units:
Programming in Java Unit 2
Programming in Java Unit 3
Programming in Java Unit 4

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This lecture covers wrapper classes in Java, primitive to object conversion, boxing and unboxing, autoboxing, wrapper class methods, and object oriented usage of primitive values, making it highly useful for Programming in Java semester examinations.

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