Acm java programming problems

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Hello all I've started Programming since 2 days and I have an assignment to do ; the assignment is """ Write a Java program that takes applied force[N] and mass[kg] of an object from user and calculate its acceleration """"" so here is the code that I wrote """ in the message below
'''' my problem is that the program won't run till giving the FORCE and MASS certain values and what I want from the program to take any value the user gives. what should I do ?

What I have tried:

package physics;


import acm.program.ConsoleProgram;

public class Physics extends ConsoleProgram {
public void run() {

readDouble("Please entre the Force applied ");
double Force =

readDouble("Please entre the Mass");

double Mass=

double acceleration = ( Force/Mass ) ;
println("The accelration is : "+Force/Mass);





}



}