Array Declaration, Allocation, and Default Values

Beginner13 min read•Updated: 2026-10-22

📦 Array Declaration, Allocation, and Default Values in Java

Introduction

An array in Java is a container object that holds a fixed number of values of a single type. Unlike C/C++ where arrays can be on the stack, all Java arrays are objects allocated dynamically on the heap, managed by the garbage collector.

🛠️ Array Syntax & Allocation

1public class ArrayBasics {
  public static void main(String[] args) {
      // 1. Declaration and Allocation with 'new'
      int[] scores = new int[5]; // Allocated on heap with default values
5 
      // 2. Initializing via Array Literal
      String[] branchCities = {"Shikohabad", "Firozabad", "Agra", "Mainpuri"};
8 
      // 3. Array Length Property (Notice: .length is a property, NOT a method!)
      System.out.println("Cities count: " + branchCities.length);
      System.out.println("First city:   " + branchCities[0]);
      System.out.println("Last city:    " + branchCities[branchCities.length - 1]);
  }
14}

📋 Default Initialization Values in Java

When an array is allocated using new Type[N], all elements are automatically initialized to zero-equivalents:

Numeric types (byte, short, int, long): 0
Floating point (float, double): 0.0
Booleans: false
Objects / Strings / References: null

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Array Iteration, Linear Search, and Min/Max Algorithms

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Nested Loops and Algorithmic Pattern Output	Array Iteration, Linear Search, and Min/Max Algorithms

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Array Iteration, Linear Search, and Min/Max Algorithms

Array Declaration, Allocation, and Default Values

Beginner13 min read•Updated: 2026-10-22

Study Materials

📦 Array Declaration, Allocation, and Default Values in Java

Introduction

🛠️ Array Syntax & Allocation

1public class ArrayBasics {
  public static void main(String[] args) {
      // 1. Declaration and Allocation with 'new'
      int[] scores = new int[5]; // Allocated on heap with default values
5 
      // 2. Initializing via Array Literal
      String[] branchCities = {"Shikohabad", "Firozabad", "Agra", "Mainpuri"};
8 
      // 3. Array Length Property (Notice: .length is a property, NOT a method!)
      System.out.println("Cities count: " + branchCities.length);
      System.out.println("First city:   " + branchCities[0]);
      System.out.println("Last city:    " + branchCities[branchCities.length - 1]);
  }
14}

📋 Default Initialization Values in Java

When an array is allocated using new Type[N], all elements are automatically initialized to zero-equivalents:

Numeric types (byte, short, int, long): 0
Floating point (float, double): 0.0
Booleans: false
Objects / Strings / References: null

Next Lesson

Array Iteration, Linear Search, and Min/Max Algorithms

Continue learning with hands-on practice, examples, and exercises in the upcoming topic.

Related Lessons

Previous Lesson	Next Lesson
Nested Loops and Algorithmic Pattern Output	Array Iteration, Linear Search, and Min/Max Algorithms

Practice Quiz

Test your understanding of this lesson with 1 questions. Each question has one correct answer.

Previous Next