Primitive vs reference storage in Java - Quick Revision & Key Differences

overview

Recall & Review

beginner

What is a primitive type in Java?

A primitive type in Java is a basic data type that stores simple values directly in memory, such as int, double, boolean, and char.

beginner

How does Java store reference types differently from primitive types?

Java stores reference types as addresses (references) pointing to objects in the heap memory, not the actual object data itself.

beginner

What happens when you assign one primitive variable to another?

The value of the primitive variable is copied directly, so both variables hold independent copies of the data.

beginner

What happens when you assign one reference variable to another?

The reference (address) is copied, so both variables point to the same object in memory.

intermediate

Why is understanding primitive vs reference storage important?

It helps avoid bugs by knowing when changes affect original data or just copies, and how memory is managed in Java.

Which of these is a primitive type in Java?

A int

B String

C ArrayList

D Object

When you assign one reference variable to another, what happens?

A A new object is created

B The reference is copied, both point to the same object

C The object data is copied

D The reference variable becomes null

Which memory area stores primitive variables in Java?

A Stack

B Method Area

C Heap

D Permanent Generation

If you change the value of a primitive variable copied from another, what happens to the original?

A It throws an error

B It changes too

C It becomes null

D It remains unchanged

Which of these is true about reference types?

A They cannot be assigned to other variables

B They store actual data directly

C They store memory addresses pointing to objects

D They are always immutable

Explain the difference between primitive and reference storage in Java.

Describe what happens in memory when you assign one reference variable to another in Java.