北大青鸟APTECHJava练习题：AccpSchool.javaAddCust.javaAddition.javaAgeRate.javaApp_01.javaAutoChat.javaAutoLion.java2AutoLionTest.javaCalcDay.javaCalcDiscount.javaCalsAvgNum.javaCalsHRNum.javaCalsSXHNumber.javaCustomer.javaDownBall.javaDownBall_WrongCode.javaFriend.javaFriendAdd.javaGift.javaGiftSend.javaGoodLuck.java