Object Cloning

title: Object Cloning in Java description: Java mein objects ko copy karna

Object ki exact copy banana.

Shallow Copy

Object.clone() — References copy hoti hain, nested objects nahi.

java exampleWoHoTech

class Address {
    String city;
    Address(String city) { this.city = city; }
}

class Person implements Cloneable {
    String name;
    Address address;

    Person(String name, Address address) {
        this.name = name;
        this.address = address;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone(); // Shallow copy
    }
}

Person p1 = new Person("Ram", new Address("Delhi"));
Person p2 = (Person) p1.clone();

p2.name = "Shyam";       // p1 unaffected
p2.address.city = "Mumbai"; // p1.address.city bhi Mumbai ho gaya! (same object)

Deep Copy

Nested objects bhi copy karo.

java exampleWoHoTech

class Person implements Cloneable {
    String name;
    Address address;

    @Override
    protected Object clone() throws CloneNotSupportedException {
        Person cloned = (Person) super.clone();
        cloned.address = new Address(address.city); // Deep copy
        return cloned;
    }
}

Copy Constructor (Alternative)

java exampleWoHoTech

class Student {
    String name;
    int age;

    Student(Student s) {
        this.name = s.name;
        this.age = s.age;
    }
}

Student s1 = new Student();
s1.name = "Ram"; s1.age = 20;
Student s2 = new Student(s1); // Copy

Cloneable Interface

Marker interface hai (koi method nahi)
Implement na karo to CloneNotSupportedException

title: Object Cloning in Java description: Java mein objects ko copy karna

Object ki exact copy banana.

Shallow Copy

Object.clone() — References copy hoti hain, nested objects nahi.

java exampleWoHoTech

class Address {
    String city;
    Address(String city) { this.city = city; }
}

class Person implements Cloneable {
    String name;
    Address address;

    Person(String name, Address address) {
        this.name = name;
        this.address = address;
    }

    @Override
    protected Object clone() throws CloneNotSupportedException {
        return super.clone(); // Shallow copy
    }
}

Person p1 = new Person("Ram", new Address("Delhi"));
Person p2 = (Person) p1.clone();

p2.name = "Shyam";       // p1 unaffected
p2.address.city = "Mumbai"; // p1.address.city bhi Mumbai ho gaya! (same object)

Deep Copy

Nested objects bhi copy karo.

java exampleWoHoTech

class Person implements Cloneable {
    String name;
    Address address;

    @Override
    protected Object clone() throws CloneNotSupportedException {
        Person cloned = (Person) super.clone();
        cloned.address = new Address(address.city); // Deep copy
        return cloned;
    }
}

Copy Constructor (Alternative)

java exampleWoHoTech

class Student {
    String name;
    int age;

    Student(Student s) {
        this.name = s.name;
        this.age = s.age;
    }
}

Student s1 = new Student();
s1.name = "Ram"; s1.age = 20;
Student s2 = new Student(s1); // Copy

Cloneable Interface

Marker interface hai (koi method nahi)
Implement na karo to CloneNotSupportedException

Object Cloning

Shallow Copy

Deep Copy

Copy Constructor (Alternative)

Cloneable Interface

Continue learning this concept

Object Cloning

Shallow Copy

Deep Copy

Copy Constructor (Alternative)

Cloneable Interface

Continue learning this concept