how to convert a string with operands to an integer

[System_Error]

I guess it's obvious I've been working on a Calculator. I got stumped pretty soon into the project. How can I get the String entered and then convert it to an int when it has operands? I've tried so many different ways:

String s = textfield.getText();// were the text might be 1+1
int i = integer.parseInt(s);

I thought if there was no spaces between the 1 and + it would work...

The only sensible way I can think of is using a string tokenizer. But how would you append the operand to the numbers?



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