Thread: Cannot get to compile

import javax.swing.*;
public class Circle {
 
    public double showRadius;
    public Circle (double showRadius){
            input=showRadius;
    }
    public void main(String[] args) {
        double myRadius = Double.parseDouble(JOptionPane.showInputDialog("Enter first integer"));
        double myDiameter;
        double myArea;
        calcRadius(1);
        calcRadius(myRadius);
        calcArea(1);
        calcArea(myRadius);
        calcDiameter(1);
        calcDiameter(myRadius);
 
 
    }
    public void calcRadius (double myRadius){
        double newRadius;
        newRadius = Double.parseDouble(JOptionPane.showInputDialog("Enter Radius"));
 
    }
    public void calcDiameter (double myRadius){
        double newDiameter;
        newDiameter = showRadius * 2;
 
    }
    public void calcArea (double myRadius){
        double newArea;
        newArea = 2 * myRadius * 3.14;
    }

The error that I am receiving is:

C:\Users\Michael\Documents\NetBeansProjects\Circle \src\circle\Circle.java:6: cannot find symbol
symbol : variable input
location: class Circle
input=showRadius;

I am new to this whole thing, and I have no clue how to fix that.

PS: Yes, I know I'm bad at coding Java.

For future reference, please use the code tags. The error refers to the constructor of Circle - where is the variable input defined?

Isn't the variable input now defined within the method?

No. Every has what is called a scope. For example, variables declared outside a method cannot by seen by the method (with a few exceptions such as the case where the variable is passed to the method or they are class instance variables). In the case of the constructor

public double showRadius;
    public Circle (double showRadius){
            showRadius=input;//what is input?
    }

Input is nowhere to be found...however

public double showRadius;
    public Circle (double input){
            showRadius=input;//now input has been passed, is within scope and can be used
    }

input is passed to the method, and is now within scope. Think about if from the computer's standpoint - look at a single method knowing nothing about the other methods - what can that method see with regards to variables?