Problem implementing Methods in a class

Question

Hi,
I am trying to change this code :
import java.util.Scanner;
public class Test {
public static void main(String[]args) {
Scanner stdin = new Scanner(System.in);
System.out.print("Number: ");
double n = stdin.nextDouble();
System.out.println(n + " * " + n + " = " + n*n);
So that instead of everytime that I get in I have to create an a new state,
I want to create it an object that could be access for every class
and I did this but is not running:
import java.util.Scanner;
public class Miguel {
public static void main(String[]args) {
public double calc(double n)
Scanner stdin = new Scanner(System.in);
System.out.print("Number: ");
double n = stdin.nextDouble();
System.out.println(n + " * " + n + " = " + n*n);
return n
System.out.println(calc());
}

Answer 1

and I did this but is not running:Not only that, it's not compiling. You can't declare methods within methods, as you have done by attempting to declare calc() inside of main().
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