004_Java Instance Variables

What is the default value of an `int` instance variable in Java?

• 1

• 0

• -1

• null

Which of the following is true about instance variables in Java?

• They are shared across all objects of a class.

• They belong to an instance of a class.

• They are always initialized to zero.

• They can only be accessed through the class name.

In the given class `Car`, what will be the output of `car1.displayCarInfo()` if `car1` is initialized as `new Car("Toyota", 2022)`?

• Car Model: Honda, Year: 2021

• Car Model: Toyota, Year: 2022

• Car Model: Toyota, Year: 2021

• Car Model: Honda, Year: 2022

How are instance variables accessed in Java?

• Through the class name

• Through an instance of the class

• Directly without any reference

• Using the `static` keyword

What is the default value of a `String` instance variable in Java?

• ""

• "null"

• null

• "undefined"

Which of the following statements is true about static variables in Java?

• They are initialized with default values only if explicitly declared.

• They are unique to each instance of a class.

• They are shared across all instances of a class.

• They cannot be accessed through the class name.

Consider the following code snippet: ```java Car car3 = new Car("Ford", 2020); ``` What will be the value of `car3.year` after this statement is executed?

• 2020

• 0

• null

• 2021

What is the primary difference between instance variables and static variables in terms of memory allocation?

• Instance variables are allocated per object, while static variables are shared across all objects.

• Both are allocated per object.

• Both are shared across all objects.

• Static variables are allocated per object, while instance variables are shared across all objects.

Why might you use access modifiers like `private` or `public` with instance variables?

• To control the memory allocation of the variables.

• To control the visibility and accessibility of the variables.

• To ensure the variables are initialized with default values.

• To make the variables static.

If a class has an instance variable of type `boolean`, what is its default value?

• true

• false

• null

• 0