让我们先来看两个类:Base和Derived类注意其中whenAmISet成员变量和思路方法preProcess 1. public Base 2. { 3. Base { 4. preProcess; 5. } 6. 7. void preProcess {} 8. } 01. public Derived extends Base 02. { 03. public String whenA... [阅读全文]