Intro | Primitive Types | Reference Types | Stack and Heap | Code Example | Quiz |
Unit 1 - Reference Types
An overview of Reference Types
Refrence Types
Reference types in Java include classes, arrays, and interfaces. Unlike primitive types, reference types store addresses (references) to objects rather than the objects themselves.
Classes
- Create complex data structures by grouping variables and methods.
Example:
class Person {
String name;
int age;
}
Person person = new Person(); // `person` reference in stack, `Person` object in heap
Arrays
- Collections of variables of the same type.
Example:
int[] numbers = new int[5]; // `numbers` reference in stack, array in heap
Popcorn Hack
public class Main {
public static void main(String[] args) {
// Create a reference type variable of type String
______ myString = "Hello, World!";
// Create a reference type variable of type Array
______ myArray = new int[] {1, 2, 3, 4, 5};
// Print the values
System.out.println(myString);
System.out.println(Arrays.toString(myArray));
}
}
Main.main(null);