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Java program to create a vector to store objects of a class

Java example to create a vector to store objects of a class.
Submitted by Nidhi, on May 18, 2022

Problem Solution:

In this program, we will create an object of Vector class to store objects of a Complex. Then we will add objects using add() method. After that, we will access objects of the Complex class and print the complex numbers.

Program/Source Code:

The source code to create a vector to store objects of a class is given below. The given program is compiled and executed successfully.

// Java program to create a vector to 
// store objects of a class

import java.util.*;

class Complex {
  int real;
  int imaginary;

  Complex(int r, int i) {
    this.real = r;
    this.imaginary = i;
  }

  void printComplex() {
    System.out.println("Complex Number: " + real + " + " + imaginary + "i");
  }
}

public class Main {
  public static void main(String[] args) {
    Vector < Complex > vec = new Vector < Complex > ();

    vec.add(new Complex(10, 11));
    vec.add(new Complex(20, 21));
    vec.add(new Complex(30, 31));
    vec.add(new Complex(40, 41));

    System.out.println("Vector Elements:");
    for (Complex c: vec) {
      c.printComplex();
    }
  }
}

Output:

Vector Elements:
Complex Number: 10 + 11i
Complex Number: 20 + 21i
Complex Number: 30 + 31i
Complex Number: 40 + 41i

Explanation:

In the above program, we imported the "java.util.*" package to use the Vector class. Here, we created two classes Complex and Main. The Complex class contains two data members real, and imaginary.

The Main class contains a main() method. The main() method is the entry point for the program. Here, we created an object vec of the Vector class and added objects of the Complex class to it using add() method. After that, we access complex numbers and printed them.

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