包含标签：Java 的文章
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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…… -
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/…… -
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…… -
java – ClassCastException：org. springframework. orm. jpa. Entitymanagerholder cannot be cast to org springframework. orm. hibernate5. SessionHolder
I tried to create a simple user login and registration page But I can't create users using the service method @Service…… -
Java – how to simulate an actor based on actorselection?
I have searched a lot about this, but there is no answer I have an actor "a" (user / a). When I receive the message "m…… -
Java-8 – Java prevents a lot of if and replaces it with design patterns
I use this code in my application and I find it very ugly for (final ApplicationCategories applicationCategorie : appl…… -
Java – spring resttemplate send list get list
I want to use spring's resttemplate to provide services. In terms of my services, the code is as follows: @PostMapping…… -
Java – eclipse cannot start the tomcat-7 server in debug mode
I'm trying to debug my code. Eclipse doesn't explain it in debug mode, but it works well when it starts normally Here …… -
Reentrant locks – Java concurrency in practice
Here are some sample code for reentry locking for "Java concurrency in practice": class Widget { public synchronized v…… -
Java – how to use the “dynamic optimization import” option to prevent Android studio from deleting wildcard imports
If you use editor > How do I prevent Android studio from using wildcards to delete imports? General > auto impor…… -
Java – Tomcat 7 and spring start the war
When I deployed the war to Tomcat 7, I received the following message: nested exception is java.lang.NoClassDefFoundEr…… -
Java – Dropbox V2 uploadbuilder: “string ‘path’ does not match pattern”
I'm trying to use Drop@R_817_2419 @The V2 API uploads my application data files (SQLite and preferences) from my Andro…… -
Java – accepts only a few characters of EditText
I need to implement EditText on Android, which only accepts a specific range of characters, namely: "s, a, Q, W, R, B,…… -
Java – how to sort an array composed of “null” and a string?
I have an array of 20: private Karte[] deckArr; deckArr = new Karte[20]; Now I want to sort the array by name every ti……