Java Program to Create an Array of Objects

Summary: In this programming example, we will learn to create an array of objects in Java.

A class in Java can be interpreted as a user-defined type, hence we can use it as a type to create an array (like an array of primitive types) that will store its objects.

Example:

//Array of Integers
int numbers[] = new int[size];

//Array of Objects
class_name object_name[] = new class_name[size];

Here is a Java program that create an array of the Student class and output the same:

import java.util.Scanner;
 
class Student{
  public int roll;
  public String name;
 
  Student(int roll, String name){
    this.roll = roll;
    this.name = name;
  }
 
  //Override toString() to print object directly
  public String toString(){
    return "{roll: "+this.roll+", name: "+this.name+"}";
  }
  
}
 
class Main {
  public static void main(String[] args) {
    Scanner in = new Scanner(System.in);
 
    //Declare Array of class Students
    Student stdArray[]= new Student[3];
 
    System.out.println("Enter 3 students details");    
    for(int i=0; i<3; i++){
      //Create a new object of class Student
      Student newStudent = new Student(in.nextInt(),in.next());
      //Assign the object to the object array
      stdArray[i] = newStudent;
    }
 
    System.out.println("Students details are:");    
    for(int i=0; i<3; i++){
      //Student.toString() method will be used to output object
      System.out.println(stdArray[i]);
    }
 
  }
}

Output:

Enter 3 students details
1 Ak
2 AAk
3 Avk
Students details are:
{roll: 1, name: Ak}
{roll: 2, name: AAk}
{roll: 3, name: Avk}

In the above program, we have overridden the toString() method in the Student class to display object information in a structured format.

The this keyword in the string ensures that the values corresponding to the current instance is returned.

When we output stdArray[i], the data member values of instance at index i of the array gets printed.

Hope now you can easily create an array of objects in Java. If you have any doubts or suggestion then comment below.