How to convert a String into Arithmetic Expression

 import bsh.*;
 class Operation
 {
    public static void main(String[] args)throws Exception
    {
        Interpreter i=new Interpreter();
        int r=(Integer)i.eval(args[0]);
        System.out.println(r);
    }
}
you just need to compile above code and interpret as follows
C:\java Operaraion 1+2+\4*6