包含标签：Java 的文章
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Java – get all rejected additions to set
I'm not very good at hashsets. I want to know if I can use them The addall method retrieves duplicates deleted by hash…… -
After adding the default method in Java 1.8, does the interface remain completely abstract?
After adding the default method in Java 1.8, does the interface remain completely abstract? I'm sorry if I can't state…… -
Java – how to invert large arrays?
OK, so I know it's very easy to reverse the array by swapping items until you reach the middle like this: int array[SI…… -
Java-8 – three possible Java 8 optional values – how do you cleanly return any existing?
See English answers > teaching options in Java 8 5 return optionalA.orElseIfPresent(optionalB).orElseIfPresent(opti…… -
Avoid using global variables in Java 8 stream reduce methods
I'm trying to use Java 8 to rewrite the implementation of Moore's voting algorithm to find the major elements in the a…… -
Java – does the playframework return absolute URLs in HTTP instead of HTTPS?
I'm using only HTTPS in nginx play! A project is implemented in the framework Everything is normal, SSL is recognized,…… -
Is java “public static void main (string [] args)” the only way to create a main method?
I wonder if "Java main method" is the only way to create a main method in Java Java main methods: Solution The JVM nee…… -
How to initialize 2D string array in Java
I know how to declare arrays. I've done this: String[][] board1 = new String[10][10]; Now I want to do this. By defaul…… -
Java – build executables from different jars
I wrote a program that contains various Java libraries used in the program I used NetBeans to make the jar file of my …… -
Lambda – iterates over two lists using a Java 8 stream
How do I write the following in a Java 8 stream? int total = 0; for (ObjectA obja : rootObj.getListA()) { for (O…… -
How to make Java wait for user input
I'm trying to make an IRC robot for my channel I hope the robot can get commands from the console In order to make the…… -
Java – why is the difference between specific dates (03 / 12 / 2018) not the exact number of days?
I'm facing a strange problem with Java (versions 6, 7, 8) In this code, I try to calculate the date difference between…… -
Java – spring data JPA cannot be configured: the specified class is an interface
I have started using spring data JPA Unfortunately, I can't configure it I have entity class and repository interface,…… -
How to create a string representing Java as if it were an unsigned 64 bit value
My component was passed a long value, which I later used as a key in the cache The key itself is a string representati…… -
The Java iterator gets the next one without incrementing
I write the following loop in Java for each loop that I want to access the current and next elements of the link list …… -
How to cut the Java of each loop in half?
I'm working a lot for each loop in Java I'm using them to "draw" every class of my object, but it requires a lot of me…… -
I want to use string in Java Replaceall (regex, regex) instead of (regex, string)
Example: input = "10N10N"; input = input.replaceAll("1|N","N|1"); // Syntax not correct Expected output: n01n01 What I…… -
What is the purpose behind the static final field in the Java – collections class?
The collections class has three static final fields named empty_ LIST,EMPTY_ Map and empty_ SET. They are all interfac…… -
Java – Tomcat – learn about credentialhandler
I recently need to use containers to manage security and authentication >First, what about the credentialhandler de…… -
The value passed by Java is explicit
See English answer > is java "pass by reference" or "pass by value"? 78 Cell boardGame[][] = new Cell[8][8]; I need…… -
Lambda function in Java 8 has no parameters and return values
I want to transform a simple Java function into a lambda 8 function without any parameters, and then call it: public i…… -
Java – why must variables be initialized?
Here, I try to get the output month by entering the number of months, but why do I make a mistake Why must monthstring…… -
Switch statement found in Java method Does the method need to return something?
I was reading some Java textbooks trying to learn a new language, and I encountered this method private String monthNa…… -
Java – @ suppresswarnings annotation benefits
@Is the suppresswarnings annotation for clearer code, or is there any performance improvement or advantage by adding i…… -
Java – how to dynamically get fields from POJOs
The following is my POJO class, which has 50 fields with setters and getters Class Employee{ int m1; int m2; int m3; .…… -
JavaFX callback lambda expression
So I'm trying to update the old JavaFX application I created on the Java 6 release I got a hint that I can convert the…… -
Java – how to print the largest number in a map
I'm reading a map in Java I want to browse a map with different numbers and print out the three largest numbers in the…… -
Java – this method standard uses varags Length instead of Boolean?
I call this method many times in many places: private String changeFirstCharCase(String word) { return Character.t…… -
Java cache array length calculation in loop
See English answer > what is the cost of calling array Length 8 int[] someArray = {1,2,3,4} for (int i = 0; i <…… -
Java – compare the efficiency of two o (n) algorithms
I'm studying linked lists, and the problem is - write a function to print the middle items of a given linked list (ass…… -
Java – Maven integration test cannot find my class in the same package structure
This is my file: POM parents: <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/……