原创 Java 空指针异常是什么,要如何修复? Q:Whenyoudeclareareferencevariable(i.e.anobject)youarereallycreatingapointertoanobject.Considerthefollowingcodewhereyoudeclareavariableofprimitivetypeint:num=newInteger(10); 2017-02-11 浏览(959) 评论(0) 阅读全文