Copy Constructor in Java

This is a technique that creates a copy of an existing object of the same class. In this example, first, an object c is created. Later, we want to create another object cnew which is nothing but a copy of the object c. Here, the second constructor receives the object c as a parameter and creates a new object cnew.

ComplexNum.java

public class ComplexNum { float x; float y; public ComplexNum(int x, int y) { this.x = x; this.y = y; } // copy constructor public ComplexNum(ComplexNum ob) { this.x = ob.x; this.y = ob.y; } }

TestMain.java

public class TestMain { public static void main(String[] args) { ComplexNum c = new ComplexNum(10, 5); // copy constructor call ComplexNum cnew = new ComplexNum(c); } }

Happy Exploring!