Java基礎複習筆記8——異常處理

異常處理

a)       異常

                              i.             Throwable

1.       Error

2.       Exception

a)       RuntimeException非檢查異常

                                                                        i.             空指針異常NullPointerException

                                                                     ii.             數組下标越界異常ArrayIndexOutOfBoundsException

                                                                   iii.             類型轉換異常ClassCastException

                                                                    iv.             算術異常ArithmeticException

                                                                      v.             else

b)       CheckException檢查異常

                                                                        i.             檔案異常IOException

                                                                     ii.             SQL異常SQLException

b)       Try-catch-finally

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

1.       順序，先小後大

                           ii.             Try{}Catch(){}[catch(){}……]finally{//最終執行的一些代碼}

c)       異常抛出

                              i.             throw         //抛出異常

1.       可由catch語句接收

2.       可由調用方法的catch接收——異常鍊

                           ii.             throws       //聲明抛出何種異常

d)       自定義異常

                              i.             class 自定義異常 extends 異常類型{}

e)       異常鍊