I am writing a java application to parse a command line string such as java ParseEval 3.5 - 7.0 + 8.1. Only + and - operations are allowed. The string can contain spaces. I am at the point where I can find the position of the + or minus signs, but I am having trouble putting the numbers to be evaluated into a statement that can be evaluated. Can anyone help me with this? I am pretty new to java programming.