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Array of Objects in Java – Great Opportunity Organize Your Data Like a Pro 2025

By Shiva

Updated On:

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Array of Objects in Java

In Java, an array of objects is a data structure that holds multiple objects of the same class. Unlike primitive arrays (e.g., int[], double[]), an array of objects stores references to object instances. This approach allows handling multiple objects efficiently, making it a powerful feature in Java programming.

To create an array of objects in Java, follow these steps:

  1. Declare an array of object references.
  2. Instantiate the array with a specific size.
  3. Initialize each array element by creating an object.

Syntax:

java

ClassName arrayName[] = new ClassName[array_size];

or

java

ClassName[] arrayName = new ClassName[array_size];
java

class Account {
int accountNumber;
double balance;

// Constructor
Account(int accNum, double bal) {
this.accountNumber = accNum;
this.balance = bal;
}

// Method to display account details
void display() {
System.out.println("Account Number: " + accountNumber);
System.out.println("Balance: $" + balance);
}
}

public class ObjectArrayExample {
public static void main(String[] args) {
// Step 1: Create an array of object references
Account accounts[] = new Account[3];

// Step 2: Initialize objects in the array
accounts[0] = new Account(101, 5000);
accounts[1] = new Account(102, 7000);
accounts[2] = new Account(103, 9000);

// Step 3: Display the details of each account
for (int i = 0; i < accounts.length; i++) {
System.out.println("Account " + (i + 1) + " details:");
accounts[i].display();
System.out.println();
}
}
}

Output:

yaml

Account 1 details:
Account Number: 101
Balance: $5000.0

Account 2 details:
Account Number: 102
Balance: $7000.0

Account 3 details:
Account Number: 103
Balance: $9000.0

  1. Efficient Storage – Allows managing multiple objects in a single array.
  2. Easy Iteration – Enables processing objects using loops.
  3. Better Code Organization – Helps structure data effectively in applications.
  4. Memory Optimization – Stores references instead of actual objects, optimizing memory usage.
  • Banking Systems (to store multiple customer accounts).
  • Student Management Systems (to store student records).
  • Employee Databases (to manage employee details).
  • Inventory Systems (to store product details in e-commerce platforms).
  1. Not Instantiating Objects Before Use
    • Mistake: javaCopyEditAccount accounts[] = new Account[2]; accounts[0].display(); // Causes NullPointerException
    • Solution: Initialize objects before calling methods.
  2. Using Wrong Index
    • Always check the array length before accessing elements to prevent ArrayIndexOutOfBoundsException.
  3. Forgetting to Allocate Memory
    • Just declaring an array does not create objects. You must instantiate each element separately.

  • Java Array of Objects Example.
  • How to create an array of objects in Java.
  • Java Object Array with Examples.
  • Arrays in Java with Objects.
  • Java Object Array Explained.
  • Java Array of Class Objects.
  • Java Data Structures Array of Objects.

By understanding arrays of objects in Java, developers can write efficient, scalable, and structured code for real-world applications. 🚀.

JAVA ARRAY

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