Java 面试题目，顶者有分

[WeiWY]

1.What are delegation? Give an example.
2.Whe are constructors not specified as part of an interface?
3.Some are of the view that it would be simpler to abandon the idea of abstract calsses,and instead to use an ordinary class with null or aborting implementations of methods that the user is supposed to override. Is this a good idea?

[auzn3224]

我要回去学英语啊，
快六级考试了

[kidonline]

顶

[wb0622]

这么多人顶了,只有20分怎么够呀?

楼主再开个贴子我们继续顶

[wyvern2x]

ding

[quleaf]

Some are of the view that it would be simpler to abandon the idea of abstract calsses,and instead to use an ordinary class with null or aborting implementations of methods that the user is supposed to override. Is this a good idea?
i think so

[xiayh1002]

顶
We must study english more hardly.

[gdmmking]

明天六点起床背词了

[yy80680169]

迷糊，UP

[learnerfeifei]

唉 看来我得去学英语先哦

[cozmic]

Q1: Proxy, or Delegation? The former is a design pattern. In java Class Refection is a good example. The latter means the same as the former do in java.
Q3: Actually a more elegant and effective way to programe contains there lays, that is,Interface, Abstract Class, Class, just as Java API implies. The first one tells the property and action of an objective thing, and second one prescribe how it will be like, and the last one define what it is. Based on this idea, it is not hard for us to understand why abstract class is indispensable. In fact, when programming, we usually reduce the problem to a set of interface, then we use Abstract Classes which implement the interface to descripe possible actions of this kind of problem; each Abstract Class for each possible actions. and finally we define exactly how the problem is respectively solved.

[cozmic]

Q3: 共享的代码上移原则

[bboyyang]

问题看懂了 就是不知道答案 还要努力学习

[chw8219]

英文啊，头痛!

[mylove001]

英文啊，头痛!

[霖湘凝]

up

[bsrweibin]

不是很难啊 可是我看不懂啊

[pauliuyou]

up

[WeiWY]

谢谢大家，whe 系why拼写错误。delegation好像是java中的委托吧？

[WeiWY]

谢谢大家，分太少了，不知道怎么加分

[anleey]

唉，e文不好啊。