Mis vahe on primitiivsete ja viidete andmetüüpide vahel?

Primitive data types in Android (and Java) are basic types that store values directly in memory. They include int, boolean, char, float, and others. They occupy a fixed amount of memory and do not contain methods.

Reference types are objects stored on the heap, and the variable contains a reference (address) to the object. Examples: classes, arrays, interfaces.

Main differences:

• Storage: primitives are stored directly in the variable, references — at the address of the object.
• Passing: primitives are passed by value, references — by reference value (i.e., the address is copied).
• Mutability: primitives are immutable, objects can be mutable.
• Memory: primitives occupy less memory, objects more.

For example:

int a = 5; // primitive
String s = "Hello"; // reference type

Understanding the difference is important for memory management and program behavior.