I need helppp!

Question

Read my code and teach me what is wrong

https://code.sololearn.com/cHTJJZi2d6ST/?ref=app

Answer 1

| ¤(8,8)
|
|
|
| ¤(5,5)
|
| ¤(3,3)
|
|_____________________________________

Answer 2

You'll need to be a bit more descriptive than that. Currently your case 1 doesn't really do anything. Due to it being in a loop and the variable being both declared and instantiated within that loop the Points are created and then destroyed. They are not saved or added to the Polyline anywhere. case 3 just gets an int from the user and doesn't do anything with it. In case 2 you create and print the Polyline, but it doesn't have any Point's to work with. If all you're working on right now is case 2 then you could fix this issue by either creating 2 default Points in the Polylines default constructor or create 2 Points in the switch and create a Polyline with the other constructor. I'm trying to help without changing your program in a way that you don't intend for it to work or one that will help you to solve the issue by yourself by pointing you in the right direction.

Answer 3

The only place I see that you're printing out the point is from the switch under case 2 in main. Here you're creating a Polyline that uses the default constructor. Your default constructor is empty so p1 and p2 in the polyline are never initialized, hence they are null.

Answer 4

It might be that the package is not supported by SoloLearn

Answer 5

I am not all that good with Java even if I have basics, what is the error shown ?

Answer 6

then what is the problem ?

Answer 7

Describe exactly what you want main to do.

Answer 8

Let me try again to write the code and update.

Answer 9

Thanks guys!

Answer 10

make 3 classes
1st class Point.java (copy the index od my code)
2nd class PolyLine.java (copy the code)
and
main class Main.java

Answer 11

please use the pc

Answer 12

ok but just see my code

Answer 13

Thank you!
First of all i insert two points eg (3,3) and (5,5)
I want to print the line eg (3,3)-->(5,5)
Or if i insert a third point eg (8,8) the result is (3,3)-->(5,5)-->(8,8)

Answer 14

If you run the program the output is
(null)-->(null)

Answer 15

Could you show me the correct?

Answer 16

print a line as (3,3)-->(5,5) when i insert them

Answer 17

Change default constructor so that it gives the values you want for your points I guess

Answer 18

I am on my phone and can't go to my PC ... Sorry ...