Exceptions Exceptions类描述由程序 ClassNot Found Exception 和外部环境引起的错误 这些错误能通过程序 IOException 捕获和处理。 Arithmetic Exception ception AWTException INullPointer Except RuntimeException IndexOutOfBounds Exception hrowab Several more classes IllegalArgument Exception LinkageError Several more classes Virtualmachine erro Error AWTError Several more classesExceptions LinkageError Error AWTError AWTException Throwable ClassNotFoundException VirtualMachineError IOException Exception RuntimeException Object ArithmeticException NullPointerException IndexOutOfBoundsException Several more classes Several more classes Several more classes IllegalArgumentException Exceptions类描述由程序 和外部环境引起的错误 ，这些错误能通过程序 捕获和处理