The constructor which is used to copy one object into another object, is known as copy constructor. Actually it is the constructor in C++, not in java. Since java supports all C++ features, so this concept is supported.

Example3;

package java8s;

class A
{
	int x,y;
	A(int p, int q)    //parameterized constructor
	{
		x=p;
		y=q;
	}
	A(A r)            // copy constructor
	{
		x=r.x;
		y=r.y;
	}
	void show()
	{
		System.out.println("x="+x);
		System.out.println("y="+y);
	}
}
class Example1 {

	public static void main(String[] args) {
		A ob1=new A(100,200);
		A ob2=new A(ob1);
		System.out.println("in ob1");
		ob1.show();
		System.out.println("in ob2");
		ob2.show();
	}

}