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How to Passing Objects to a Method?

class Sphere {
double radius; // Radius of a sphere

Sphere() {

}

// Class constructor
Sphere(double theRadius) {
radius = theRadius; // Set the radius
}
}

public class MainClass {
public static void main(String[] arg){
Sphere sp = new Sphere();

aMethod(sp);

}
private static void aMethod(Sphere sp){
System.out.println(sp);
}
}