Access non static method from another class

Question

public class Canvas {
    public void erase(){}
}

I want to use that erase method in another class but since it doesn´t appear to be static, I can´t just do this

public class Country {
    Canvas.erase();
}

So how do I access that method then?

https://stackoverflow.com/questions/14567360/calling-non-static-methods-from-other-classes — Sachith Wickramaarachchi, Feb 22 '19 at 16:23
Have you tried passing `Canvas canvas` as an argument to your method? — EpicPandaForce, Feb 22 '19 at 16:24

score 2 · Answer 1 · answered Feb 22 '19 at 16:23

2

you'd need to create first an object (instance) of the class, and then call its methods, eg :

Canvas canvasInstance = new Canvas();
canvasInstance.erase();

answered Feb 22 '19 at 16:23

nullPointer

4,419
1
15
27

score 1 · Answer 2 · answered Feb 22 '19 at 16:26

1

Your only options is:

Make the method static

public static void erase(){}
Call the method from an instance of Canvas

new Canvas().erase();

answered Feb 22 '19 at 16:26

André Paris

139
6

score 0 · Answer 3 · answered Feb 22 '19 at 16:26

0

Non static method can be called with object refence only. Create an instance of Canvas class and then call erase method like,

Canvas canvas = new Canvas();
canvas.erase();

answered Feb 22 '19 at 16:26

Vikas

6,868
4
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score 0 · Answer 4 · answered Feb 22 '19 at 16:31

The way I like to do it have a static reference of Canvas so this is how to do it:

public class Canvas
{
    public static Canvas cObj;

    public void erase() { }
} 


public class Country {

    public void CallMethod()
    {
        Canvas.cObj.erase();
    }
}

That way you would be able to call erase on Class Canvas easily from class County

Access non static method from another class

4 Answers4