How do I pass a constructor to a constructor?

Question

The question says "Add a constructor to the Point class that accepts another Point as a parameter and initializes the new Point to have the same (x, y) values. Use the keyword this in your solution."

public  class Point
{
  int x;
  int y;
  //enter your code here
}

What I have applied all the concepts I can think of and hit and trial method,but none of them worked. I mean how can I pass a constructor to a constructor! This is the best I came up with.

 public Point(Point)
 {
     this.x=x;
     this.y=y;
  }

But this generates an error. "< identifier> expected public Point(Point)"

Answer 1

Your constructor should be:

public Point(Point p) {
    this.x = p.x;
    this.y = p.y;
}

This way you assign p 's attributes to your class's attributes.
You did not include the identifier p .
Although if this is the only constructor of the class then the class is useless since it needs a preinstantiated object in order to instantiate a new one.

Answer 2

At least you need to give a constructor parameter variable a name:

public Point(Point p) {
 this.x = p.x;
 this.y = p.y;
}

You don't have to pass a constructor to constructor, just an instance is enough to copy it. Instance of the class has an access to all the private fields of the same class