substring 无法编译

Java code

dollars = Long.parseLong(stringAmount, substring(0,length-3));cents = Long.parseInt(stringAmount, substring(length-2,length));

substring 都为小写，，，，但是上下两个substring都画着红线无法编译，，显示无法编译，，

试问一下这是为什么啊？

谢谢


[解决办法]
dollars = Long.parseLong(stringAmount, substring(0,length-3));
cents = Long.parseInt(stringAmount, substring(length-2,length));
替换成
dollars = Long.parseLong(stringAmount.substring(0,length-3));
cents = Long.parseInt(stringAmount.substring(length-2,length));

逗号换成.
。。。