2.3 Wrapper Classes

• Wrapper classes allow primitive types to be used in collections like ArrayList.


  True
• Wrapper classes provide additional methods beyond what is available for primitive types.


  True
• The example `Integer num = 10;` demonstrates autoboxing
• Match the wrapper class with its corresponding method:

  Integer ↔️ parseInt()

  Boolean ↔️ valueOf()

  Double ↔️ compareTo()
• Autoboxing reduces the need for explicit type conversions.


  True
• Autoboxing converts primitive types to wrapper class objects
• Wrapper classes allow primitive types to be stored in collections
• Autoboxing and unboxing are Java's automatic conversion between primitive types and their corresponding wrapper classes.


  True
• Which type of operation can wrapper classes perform that primitive types cannot?

  Parsing
• Autoboxing converts primitive types to wrapper class objects
• Autoboxing and unboxing reduce the need for explicit type conversions.


  True
• Autoboxing and unboxing eliminate the need for manual type conversions.


  True
• The `int` primitive type in Java corresponds to the `Integer` wrapper class.


  True
• Match the primitive type with its corresponding wrapper class:

  int ↔️ Integer

  double ↔️ Double

  boolean ↔️ Boolean

  char ↔️ Character
• Autoboxing and unboxing simplify the conversion between primitive types and their wrapper classes
• What do wrapper classes in Java convert primitive data types into?

  Objects
• What does unboxing convert wrapper class objects into?

  Primitive types
• What are autoboxing and unboxing in Java?

  Automatic type conversions
• What is the purpose of autoboxing in Java?

  Convert primitive to object
• Unboxing converts wrapper class objects to primitive types.


  True
• Wrapper classes provide additional methods beyond primitive types.


  True
• What is the primary purpose of wrapper classes in Java?

  Convert primitives to objects
• Order the following wrapper classes based on their corresponding primitive types:

  1️⃣ `Integer`

  2️⃣ `Double`

  3️⃣ `Boolean`

  4️⃣ `Character`
• Unboxing converts wrapper class objects to primitive types implicitly.


  True
• What is the purpose of autoboxing and unboxing in Java?

  Automatic type conversions
• Unboxing converts wrapper class objects to primitive types implicitly.


  True
• Why are wrapper classes needed for storing primitive types in collections like `ArrayList` or `HashMap` in Java?

  They accept only objects
• What is the wrapper class for the `double` primitive type in Java?

  Double
• Autoboxing in Java automatically converts a primitive type to its corresponding wrapper object.


  True
• The code `Integer obj = 10;` demonstrates autoboxing in Java.


  True
• Parametric polymorphism, also known as generics, enhances type safety in Java collections.


  True
• The code `intList.add(10);` in Java illustrates autoboxing.

  True
• The example `Integer obj = 10;` demonstrates autoboxing
• What are autoboxing and unboxing in Java?

  Automatic type conversions
• What do wrapper classes in Java convert primitive data types into?

  Objects
• Match the primitive type with its wrapper class:

  `int` ↔️ `Integer`

  `double` ↔️ `Double`

  `boolean` ↔️ `Boolean`

  `char` ↔️ `Character`
• Wrapper classes allow primitive types to be stored in collections like ArrayList
• What is the automatic conversion between primitive types and wrapper classes called?

  Autoboxing and unboxing
• What is one benefit of autoboxing and unboxing in Java?

  Simplifies code
• Autoboxing converts primitive types to wrapper class objects