Java基础复习笔记8——异常处理

异常处理

a)       异常

                              i.             Throwable

1.       Error

2.       Exception

a)       RuntimeException非检查异常

                                                                        i.             空指针异常NullPointerException

                                                                     ii.             数组下标越界异常ArrayIndexOutOfBoundsException

                                                                   iii.             类型转换异常ClassCastException

                                                                    iv.             算术异常ArithmeticException

                                                                      v.             else

b)       CheckException检查异常

                                                                        i.             文件异常IOException

                                                                     ii.             SQL异常SQLException

b)       Try-catch-finally

                              i.             Try{}Catch(){}[catch(){}……]

1.       顺序，先小后大

                           ii.             Try{}Catch(){}[catch(){}……]finally{//最终执行的一些代码}

c)       异常抛出

                              i.             throw         //抛出异常

1.       可由catch语句接收

2.       可由调用方法的catch接收——异常链

                           ii.             throws       //声明抛出何种异常

d)       自定义异常

                              i.             class 自定义异常 extends 异常类型{}

e)       异常链