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plusNanos(int offset): increases the specified nanosecond Reduce related methods minusYears(int offset): decrease the specified year minusMonths(int offset): decrease the specified month minusWeeks(int offset): decreases the specified week minusDates(int offset): decrease the specified date minusHours(int offset): decrease the specified ...

Find equivalent difference Knowledge summary: symmetric difference. Mathematically, the symmetric difference of two sets is A set composed of elements belonging to only one set but not the other set. For example, the symmetric difference of set let A = [1,2,3] and let B = [2,3,4] is A △ B = C = [1,4]. This operation in set theory is equiva ...

Definition: exceptions in Exception except RuntimeException and its subclasses. Features: the Java compiler will check it. If such an exception occurs in the program, For example, ClassNotFoundException (the specified class exception is not found) and IOException (IO stream exception), either declare and throw it through throws or catch it thr ...

if (result == null) throw new IOException("Canceled"); return result; } catch (IOException e) { eventListener.callFailed(this, e); throw e; } finally { client.dispatcher().finished(this); } } We'll use it here `client` Object (actually created above) `RealCall` Passed in when `OkHttpClien ...

In the interview, I often ask about JUC. The common one is CHM. Let's talk about the methods and operations of different versions of CHM The underlying implementation of CHM in JDK7 is implemented by segmented segment array. Segment contains hashentries, and each HashEntry forms a linked list. Common get methods: First, obtain the lock of se ...

java written test handwriting algorithm interview questions with answers 1. Count the number of words in an English article. public class WordCounting { public static void main(String[] args) { try(FileReader fr = new FileReader("a.txt")) { int counter = 0; boolean state = false; int currentChar; while((currentChar= fr.read()) != -1) { if(cur ...

catalogue preface Cache pool (constant pool) 1. Prove the existence of cache pool 2. Cache value range Implicit type conversion keyword final static 1. Static variable 2. Static inner class this,super Access modifier java8 features abnormal Java collection (container) 1,List, Set, Queue, Map preface This series focuses on t ...

0 - problem description SQL tests whether there is a value in a group of data. You want to generate a Boolean value according to whether a group of row records contain a specific value. Imagine an example where a student will take several exams over a period of time. Suppose he takes three exams every three months. As long as he has pas ...

Blog address: Coding Lemon's blog All articles will be updated on the blog at the first time! Big factory interview series fifth bullet! This chapter is special. It may summarize all the common design patterns, and then I will mark out some of the most frequently asked design patterns. There are many contents, but they are dry goods! In or ...

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