Tencent byte and other big companies interview real questions summary, Android programmers how to gracefully cross the 30K barrier

As a 3-5 Year of Android The engineer , We often encounter these bottlenecks ：

1. The technology vision is narrow
For a long time in small software companies , Outsourcing company work , Technology vision is too limited

2. Difficult to raise salary
intermediate Android There is limited room for salary growth , Basically you want to take 15k above , You can't get things that don't point to the source layer

3. Less learning resources
It's hard to improve after you get started , Simple business projects that you touch on your own , To drill those over and over again cv technology . Most of the technologies in blogs and books are abstract and fragmented , It can be used for reference and guidance , But there's no way to copy it into your own

With this Ali people P7 It's arranged by the great God Android Developing core knowledge notes , All bottlenecks can be broken quickly .

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JVM Language has to put itself in the right place , Consider your own abilities , We have to consider the course of history .

Java It's a son , again JVM Of “ Aborigines ”, Leading JVM Development direction , a big tree strikes roots deeply , with luxuriant foliage ,“ This sincerity cannot compete with ”.

Compare with others JVM Language ,Kotlin I can put myself in a better position , No, “ It's better to have a kind of ”、 take Java Instead of ambition , On the contrary, they always insist on cooperating with Java Very strong compatibility , A lot of use Java API, Put the bloated Java The code is packaged in short statements , Quietly doing “ The paster ” The job of . For now ,Kotlin Quite competent for the role , Type inference 、 Expand 、 Air safety 、 Higher order function , Which is not a practical and powerful syntax enhancement ？

in my opinion ,Kotlin Yes Java The biggest change for developers is not to reduce the time wasted writing code , It's a series of changes in ways of thinking ：

• Instead of letting developers control the loop manually , It's better to encapsulate the loop inside the class library , class C The three paragraph form of language for Circulation and while The cycle is just bug And complex code ;
• object-oriented , But you can't be tied to classes and objects , Free up functions ！
• Every line of code has to be used on the blade , Minimize template code and redundant declarations ;
• Programming languages should be well designed “ The default configuration ”, Guide developers to use “ The default configuration ”, For example, classes are not inheritable by default 、 The access control character defaults to public、 Collection is read-only by default 、 The default type is not null wait ;
• ** Invariant objects are better than mutable objects ,** multi-purpose val To use less var、 Use more read-only sets and less variable sets 、 Use more nonempty types than nullable types ;
• ** Class summary “ Return to one's true heart ”, Only undertake “ Abstract objects ” The function of ,**Kotlin Encourage more use of extensions 、 Don't cram a bunch into a class API And the implementation , Use as far as possible “ Class basic framework + External extension function ” The pattern of .

These things are all learning Kotlin、 Write Kotlin The process is imperceptibly conveyed to developers , Can guide the traditional conservative Java Developers embrace modern programming languages .

Kotlin It's not a science , It's a set of tools , It is not like Scala, Not so bookish , All features are practical 、 Brevity comes from ;

Kotlin Not a revolutionary , It's the reformer , It is not Go, There is no ambition to take over the world , Only “ Give Way Java Better to use ” A solid goal for us , A long way to go ;

Kotlin Not perfect , But it's improving , It is not like Java By Oracle One family controls , No uncontrolled features are allowed ,Kotlin The birth and development of the community are inseparable from the promotion of , More and more new features are being added at the call of developers ;

Kotlin Not everything , It's to make up for Java The short board is the first ,Kotlin Will not become C++.

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