public class Foo
{
        private double var1;
        private double var2;

        public Foo(double val)
        {
                init(val);
                doSomething();
        }

        private void init(double val)
        {
                var1 = val;
        }
        
        private void doSomething()
        {
                var2 = Math.sqrt(var1);
        }

        public double getResult()
        {
                return var2;
        }
}