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Why do we need a copy constructor and when should we use a copy constructor in Java?
A copy constructor is a parameterized constructor and it can be used when we want to copy the values of one object to another.
Example:
class Employee {
int id;
String name;
Employee(int id, String name)
{
this.id = id;
this.name = name;
}
Employee(Employee e)
{
id = e.id;
name = e.name;
}
void show()
{
System.out.println(id + " " + name);
}
public static void main(String args[])
{
Employee e1 = new Employee(001, "Aditya");
Employee e2 = new Employee(e1);
e1.show();
e2.show();
}
}In the above code, e1 is passed as an argument to the second constructor. Thus values of e1 are copied into object e2.
Output:
1 Aditya 1 Aditya
Updated on 30-Jul-2019 22:30:26
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