Shenzhen Prudential written examination record

Foreign enterprises in Britain , Written examination in pure English , I can't turn my mind around in the back .

altogether 11 To the question , Each question has a time limit , The total time is one hour and fifty minutes . There is not enough time for some questions , There is still a lot of time left for some questions .

The overall difficulty of the topic is not big , The difficulty lies mainly in English reading comprehension .

Multiple choice questions are basically random , There are several details , I don't know which one to choose in Chinese .

Make a note of ：

choice question

sql topic

And then there's a sql topic , Didn't do it , I really don't know what the problem is ：

Just now, I found that , And the appearance of use cases , I didn't read the examples given , Is really a pity . I'm not careful about the topic ！

SELECT d.name, count(*)
FROM DIRECTOR d left join MOVIES m
on d.id = m.directorid
GROUP BY name

Let the output director and film number , And the director of the movie . There should be no problem with what is written .
But there has never been an example , I've been fiddling and changing , I don't know where the problem is .

Test examples

A question for writing test cases , Relatively simple ：

Situational programming problem

A programming problem ：

The main difficulty is reading comprehension , A few points ：
1、 Implementation interface , Rewrite function . It was used lamda Function to generate callable Input ：new ReptileEgg(() -> new FireDragon())
2、 preservation ReptileEgg Input parameters of constructor , stay hatch Function through call start-up callable, Return the output parameters of its package
3、 Multiple calls hatch When , Returns the specified exception

The first two points were stumbled and realized , When it comes to the third , Starting to return null, It didn't .

Paste the initial exception , Still just . Read the question again , It seems that let me return to the exception written in the title , See time left 30 second , Web pages cannot be copied , Just copy it , The result reminds that there is no such exception . Later, I thought it should be to return IllegalStateException, I wrote IlegalStateException

Ten seconds left , Roll back to null The state of , Immediately submitted the answer . Later, I thought of returning directly null It's a mistake , And when I changed it back, it seemed that I deleted an extra semicolon . If the code can't run, it's estimated that the whole problem won't be scored . deadly , It's estimated that the whole written examination will only get half the score . I don't think so .

Forget it , To sum up the problem , Or code skills are not very good , When writing, I forgot or reported mistakes in many places , I can't remember how to write . Also, English is almost interesting , Reading is difficult in many places . Keep trying , Don't give up learning English , In time of peace prepare for war , After finding a job, you have to recite words , Listen to English

Ps：

establish Callable Methods of wrapping class instances

stay Java 8 in , Already used @FunctionalInterface The comments Callable Interface .
Now? , We can use lambda Expression creation Callable example .

Callable<Integer> callableObj = () -> {
     return 2*3; };

Equate to ：

Callable<Integer> callableObj = new Callable<Integer>() {
    
	@Override
	public Integer call() throws Exception {
    
		return 2*3;
	}
};

If the class to be passed in , You just need to implement an interface , It can be replaced by lamda
Lambda A single sentence , Quotations can be omitted return, Such as Callable jsonObjectSupplier = () -> JSON.parseObject(s);

Return to topic ：
ReptileEgg Constructor needs to pass through parameters Callable, and FireDragon Realized Reptile Interface , Therefore, enter directly new ReptileEgg(() -> new FireDragon()), amount to ：

Callable<Reptile> callableObj = new Callable<Reptile>() {
    
	@Override
	public Reptile call() throws Exception {
    
		return new FireDragon();
	}
};