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This article mainly explains "what are the pitfalls encountered in the Java interview". Interested friends might as well take a look. The method introduced in this paper is simple, fast and practical. Now let the editor take you to learn "what are the pits encountered in the Java interview?"

1.StringBuilder instead of String often ask the difference of String,StringBuilder,StringBuffer in the splicing interview.

1. If the parameter is not validated short, it is determined that the value is equal.

The following writing puts the constant to the left of the method to prevent NPE.

two。 Many brothers have stepped on this hole. Do you know why?

The print result is false, and the following result is true. Why?

3. Pass the variable as a parameter and change the parameter value in the method. Does the value of the variable change? What is the total value in the following figure?

4. The list converted by the array can only loop through, not look at the length, add elements, delete elements, this is why? The following figure shows an error in the execution of the code!

5. Remove Li Ming's name from the list. Is there any problem with the implementation of the following figure?

6. Which method is used to create a file directory under a specified directory? both methods are correct. Why not create a directory the first time but create it the second time?

7. The boss scolded me when he came back from the client, saying that the amount displayed in the customer interface was very strange, and there was something wrong with my code.

8. Interviewer: can you tell me several ways to implement multithreading in java?

Interviewer: inherit the Thread class and implement the runnable interface!

Interviewer: is there any other way?

Interviewer: only these two kinds of realization?!

Interviewer: let's talk about something else, hehe.

9. I just want this to cycle three times. Is there a problem?

10. This has not been figured out, which true or false will be returned?

At this point, I believe you have a deeper understanding of "what are the pits encountered in the Java interview?" you might as well do it in practice. Here is the website, more related content can enter the relevant channels to inquire, follow us, continue to learn!

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