Java
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Java – how to calculate the length of multiple strings
I have a string like this: Hey, my name is $name $; I'm over $years old. I like playing $sport $. I live in $country $…… -
Java 8: merge 2 string lists into the map
See English answers > clearest way to combine two lists into a map (Java)? 15 List<String> keys List<Strin…… -
Java – mulestudio Studio: Studio target failed to execute
I copied / pasted a work project in the mule studio workspace (from mule studio) to create a new project After that, I…… -
Java – regular expressions that begin with an underscore but do not contain any underscores
I try to get the name of the file from the last underscore until the end For example, ABC_ AA. XML should be ABC and A…… -
Java – Maven: exclude the “meta-inf / Maven” folder from the jar
I use Maven to build jars When I checked the jar, I saw a maven folder in the meta - inf folder I want it to be exclud…… -
How to wrap Java util. Iterator to change the type of the object being iterated
I'm providing some appearance classes for third-party APIs. I need to wrap an iterator so that I can replace things it…… -
Java – method of overriding with different parameters
Suppose I have a parent class: class Parent{ public void aMethod() { //Some stuff } } It is a children…… -
Java – does the HTTP protocol version “http / 1.1” contain HTTPS?
I don't actually see this problem, perhaps because it is so basic I am using java Apache httpcomponent and check the r…… -
Understanding Java executorservice
I'm trying to learn how to use Java's executorservice, I am reading the following discussion java thread simple queue …… -
Haskell pattern matching vector
I'm following an online tutorial on Haskell We define a function to add a two-dimensional vector, represented by tuple…… -
Java – getters for display
I'm studying getters / incubators. The general idea is that they are evil and should be avoided You should let the obj…… -
RX Java – how to explicitly unsubscribe observable after oncomplete
In the following code, how and where does unsubscribe explicitly unsubscribe observable after completing oncomplete? g…… -
Java does not recognize elements in ArrayList?
I have a program where I make an ArrayList to save some cab objects I always get an error. What I get from the message…… -
Java – cannot save integers in an object array
I want to parse the string in object [] into integer and save it in the same place, as shown below: public class ArrPa…… -
Java – the special behavior of ArrayList remove () – why?
When we delete - 1 and empty the ArrayList, it will throw concurrentmodificationexception. When we delete 0 from the s…… -
Java – how to create different classes for database connections
I am developing a spring startup application. I need a general class to provide me with database connections for all c…… -
Java – cut and stack arrays
I have an int array as input The length of the array is always 2 ^ n. I want to cut the array in half and stack it Rep…… -
How does the Java – XOR (^) exchange algorithm work?
This is a way to swap a and B without requiring a third variable I understand whether XOR means "true" or "false" in t…… -
How to prevent Java from separating JSON strings passed as command-line parameters into single subunits of args []
I want to pass this JSON string to the Java class through command - line arguments However, in each space, the string …… -
Why if comparison doesn’t work in Java
I create a hash table in Java This is part of my code while (table[pos]!=null) { if (table[pos]==key) { …… -
Java – is it better to use inline local variables or chain methods?
If I have a series of method calls, each value for the next call, I should store them in local variables, as follows: …… -
How to create a general placeholder function in Java and use the function as a parameter later?
I don't know how to express my question, but it's simple I want to create a generic placeholder function that takes a …… -
Java – @ before / @ beforeclass doesn’t seem to work, and the object represents null
I was learning JUnit and had a problem at the beginning At the beginning, I want to initialize the object that will be…… -
java. Lang.unsupported operationexception: cannot resolve property at index 13: typedvalue {t = 0x2 / D = 0x7f010046 a = – 1}
I work for Android attrs XML file adds an attribute for different color shades In styles In the XML file, I give these…… -
I should put Java stream Is the map function used with the switch statement?
I want to stream objects to different objects according to type Stream<Animal> animals = Arrays.stream(Arrays.as…… -
Java – (floating point value, integer value, long value) how to give unexpected results?
import java.util.*; import java.util.*; import java.lang.*; class Main { public static void main (String[] args) …… -
Why does the java compiler generate strange local variables and stack mapping frames? How can they be used to reliably determine variable types?
With the help of ASM framework, I create a Java bytecode detection tool, which needs to determine and possibly change …… -
How to retrieve parent objects by filtering from child objects in a Java stream
People are my root poja, and I have a list of phone numbers for my children String firstName; String lastName; Long …… -
Java – an alternative to if else statements when using double precision
According to the salary, I need to assign a specific tax rate to the employee object Salary is defined by annual salar…… -
Compilation of generic class using generic interface failed
As far as I know, the following code should run without any compilation errors However, when I run this program, I get…… -
Java – performance analysis using IntelliJ and debug in visualvm
I want to describe the test application launched by IntelliJ For analysis, I used visual VM I use the parameter - j-do…… -
Java – is the order of variables important in packet change read / write operations in Parcelable?
I have the following implementation of a Parcelable class: public class DemoModel implements Parcelable { private ……