Question

Here is my class that implements copy constructor

public class TestCopyConst
{
    public int i=0;
    public TestCopyConst(TestCopyConst tcc)
    {
       this.i=tcc.i;
    }
}

i tried to create a instance for the above class in my main method

TestCopyConst testCopyConst = new TestCopyConst(?);

I am not sure what i should pass as parameter. If i have to pass a instance of TestCopyConst then again i have to go for “new” which in turn will again prompt for parameter

TestCopyConst testCopyConst = new TestCopyConst(new TestCopyConst(?));

what is missing here? or the concept of copy constructor is itself something different?

Answer 1

You’re missing a constructor that isn’t a copy constructor. The copy constructor copies existing objects, you need another way to make them in the first place. Just create another constructor with different parameters and a different implementation.