L-17 Arrays - Reference | Complete Java Course 2025 #java

JAVA Complete Course 2025
Chapter 18: Arrays - Reference

**Title:** Java Memory Layout: Arrays of Reference Types Explained! 🚀

**Description:**
Ever wondered how Java handles arrays of reference types in memory? In this video, we dive deep into the memory layout of Java arrays that store objects, explaining stack vs. heap allocation, references, and garbage collection!

📌 **Topics Covered:**
- What happens when you declare `Person[] persons = new Person[5];`
- How Java stores arrays of objects in memory
- Stack vs. Heap allocation explained visually
- Garbage collection and reference management

🔍 **Memory Layout Breakdown:**
- The array itself is stored in the **heap**
- The array elements store **references**, not actual objects
- Objects are **created separately** in the heap and referenced by the array
- Uninitialized elements are **null** until explicitly assigned

💻 **Example Code:**
```java
Person[] persons = new Person[5]; // Step 1: Creates an array of references
persons[0] = new Person("Alice"); // Step 2: Instantiates an object at index 0
persons[2] = new Person("Bob"); // Step 3: Instantiates another object at index 2
```

🔵 **Visual Breakdown of Memory Layout:**
```
Stack Heap
-----------------------------------------------------
persons (reference) [ Ref1 | null | Ref2 | null | null ]
Ref1 Person("Alice")
Ref2 Person("Bob")
```

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#Java #MemoryManagement #Coding #JavaProgramming #Arrays #HeapVsStack #GarbageCollection

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