
Array of Objects in Java
✅What is an 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.
✅How to Create an Array of Objects in Java?
To create an array of objects in Java, follow these steps:
- Declare an array of object references.
- Instantiate the array with a specific size.
- Initialize each array element by creating an object.
Syntax:
javaClassName arrayName[] = new ClassName[array_size];
or
javaClassName[] arrayName = new ClassName[array_size];
✅Example Program: Creating and Using an Array of Objects:
javaclass 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:
yamlAccount 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
✅Key Benefits of Using Arrays of Objects in Java:-
- Efficient Storage – Allows managing multiple objects in a single array.
- Easy Iteration – Enables processing objects using loops.
- Better Code Organization – Helps structure data effectively in applications.
- Memory Optimization – Stores references instead of actual objects, optimizing memory usage.
✅Use Cases of Arrays of Objects in Java:-
- 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).
✅Common Mistakes & How to Avoid Them:
- Not Instantiating Objects Before Use
- Mistake: javaCopyEdit
Account accounts[] = new Account[2]; accounts[0].display(); // Causes NullPointerException
- Solution: Initialize objects before calling methods.
- Mistake: javaCopyEdit
- Using Wrong Index
- Always check the array length before accessing elements to prevent
ArrayIndexOutOfBoundsException
.
- Always check the array length before accessing elements to prevent
- Forgetting to Allocate Memory
- Just declaring an array does not create objects. You must instantiate each element separately.
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By understanding arrays of objects in Java, developers can write efficient, scalable, and structured code for real-world applications. 🚀.