Using Objects in AP Computer Science A

Autoboxing and unboxing

ONLY WITHIN CONDITIONAL STATEMENTS THAT REQUIRE OBJECTS.

WHEN WE CALL THE VALUEOF AND PARSE METHODS ON WRAPPER CLASSES.

DURING COMPILATION TIME TO OPTIMIZE CODE EFFICIENCY.

They provide additional static utility methods.

They convert primitives into objects.

They ensure type safety through generics.

They handle automatic conversion between strings and primitives.

Double.toString(42.d)

Interger.parseInt("three")

Interger.toString(3)

String.valueOf(true)

Increase security by preventing direct access to machine level data representation.

They can then be used with generic data structures like Collections that only accept objects.

It reduces memory usage by optimizing storage space for simple data types.

It enhances performance by lowering overhead associated with autoboxing operations.

Dividing one Integer by another involves unboxing before performing arithmetic operations.

Comparing two int primitives with '==' does not involve any wrapper classes.

Assigning an int primitive to an Integer object variable performs boxing automatically.

Assigning an Integer object to another Integer object simply copies references without boxing.

null

An error occurs.

true

false

static method

abstract method

private method

final method

When memory efficiency is the top priority and all values are guaranteed non-null.

When the application needs to store null values as part of the data set.

When the array is required to only store primitive data types for faster access time.

When the application must handle computationally intensive arithmetic operations.

.compare()

==

.equalValue()

.equals()

"5"

An instance of the Integer class

null

5