Java

Copy Constructor in Java

A copy constructor is a constructor that creates a new object using an existing object of the same class and initializes each instance variable of newly created object with corresponding instance variables of the existing object passed as argument.

Syntax

public class_Name(const className old_object)

Example

Public student(student o)

Code Snippet

//Copy Constructor in Java

import java.util.Scanner;

class CopyConstructor {
    int age;
    String name;

    CopyConstructor(int a, String n) {
        age = a;
        name = n;
    }

    CopyConstructor(CopyConstructor cc) {
        age = cc.age;
        name = cc.name;
    }

    void display() {
        System.out.println("Your name is : " + name + "\nAge is : " + age);
    }

    public static void main(String[] arg) {
        System.out.print("Enter your name and age :");
        Scanner scan = new Scanner(System.in);

        String name = scan.nextLine();
        int age = scan.nextInt();

        CopyConstructor cc = new CopyConstructor(age, name);
        CopyConstructor c2 = new CopyConstructor(cc);

        cc.display();
        c2.display();
    }
}