包含标签：Java 的文章
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Java – dynamodbmapppingexception: mapping without hash key
When writing dynamodb Java application, if the table and its data model are not configured correctly, you can receive …… -
Java – stream mapping to find the value of the latest key
I have a map < < element, attributes >, which consists of the following (example) classes and instances of en…… -
Java – “unable to parse the symbol ‘request’ of Facebook graph API” error
I will the latest Facebook SDK 4.0 1 is included in the Android studio project I want to make the basic graph API call…… -
When they are Is java integer always = = when equals()?
See English answer > java: integer equals vs. = = 5 Integer x = 5; Integer y = x + 1; Integer z = y - 1; x.equals(z…… -
Get errors in C using vector and struct
What is the error in this Code: #include <iostream> #include <vector> #include <algorithm> using nam…… -
Java – ‘CMD’ is not recognized as an internal or external command and can run programs or batch files
When I build my project in NetBeans, it shows: 'cmd' is not recognized as an internal or external command,operable pro…… -
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…… -
What does Java – compareto() actually return?
The CompareTo () method in Java returns a value greater than / equal to / less than 0 But value itself is my problem W…… -
Java – hashcode contract that maintains specific conditions, and equals () depends on two integers
I have a basic structure class: class Employee { int eId; String eName; Employee(int id,String name) { this.eId= …… -
java – Stream. Is findany a short circuit operation?
Consider this code Object found = collection.stream() .filter( s -> myPredicate1(s)) .filter( s -> myPre…… -
Rxjava in scheduler IO () does not work in the thread
The problem is: I have observable and subscriber I'm trying Start observable in the IO () thread because it applies to…… -
Set boolean flag in Java 8 stream
I wonder what is the best practice for setting boolean flag values from Java streams Here is an example I want to do: …… -
Java – how to correctly throw a NullPointerException?
I need to write a method delete (), which accepts an int parameter K and deletes the k-th element in the linked list (…… -
When using java 8 update101, HashMap Entries cannot be cast to collection
After updating to Java 8 update 101, I encountered an exception in the following code It works well with Java 8 update…… -
How to effectively convert java code to Python?
I would be glad if you could tell me how to translate code from Java to python Solution If you want to translate java …… -
Java – insert different arrays in ArrayList
I inserted an array in ArrayList, but after inserting the second array, the first array is the same as the second arra…… -
Why doesn’t my java exchange function work?
See English answer > is java "pass by reference" or "pass by value"? 78 void swap(int a,int b) { int temp = a; …… -
Dynamic – ownership tracking in rust: difference between box (heap) and t (stack)
Trying to use the programming language rust, I found that the compiler can track the movement of some structural field…… -
Splitting strings at specific locations in Java
Suppose you have a string in the form of "word1 word2 Word3 word4" The easiest way to split it is split [0] = "word1 w…… -
Upgrade from A-Series to D-series azure virtual machines
We installed SQL sever.com on a series of virtual machines We want to upgrade to D series virtual machines Is it as si…… -
Java – isn’t it bad to import unused packages?
For example, when you work in a team with the same file, you can only partially understand the different packages requ…… -
java. Lang. illegalargumentexception “Dao fields cannot be set using spring 4 and Hibernate 4”
I'm trying to follow the tutorial (Using STS): Everything goes well except execution Here's what I got during deployme…… -
Java – appium long press and move elements (drag and drop) do not work
I have a solution to test such IOS applications: I use the following code: TouchAction action = new TouchAction(driver…… -
Java – onitemclicklistener() does not use the list adapter
I extract the data into the list adapter by calling a function called getalldishes() Now I want to add onitemclicklist…… -
The Java – equals method is incompatible with throwable
I have some externally provided callbacks to run Because they can contain anything, I prefer to risk catching throwabl…… -
The Java static method can be invoked in Kotlin.
Suppose we have a Java static method: //Java code public static void printFoo() { System.out.println("foo"); } Can…… -
The shortest representation of special lambda expressions in Java 8
I'm new to Java 8 and I'm messing up a little Now I have tried the andthen method of the function interface consumer i…… -
Why do I get Java Lang.illegalargumentexception: wrong number of parameters when calling method with varargs using reflection
See English answers > wrong number of arguments error when invoking a method class Sample{ public void doSomet…… -
Java – why does it want the method to be static?
I'm building my first game. I rely heavily on various tutorials and guides on the Java website. I have a problem packa…… -
Using lambda’s AWS dynamodb trigger in Java
I tried to trigger AWS lambda function written in Java on dynamodb stream event Amazon has the same guide, which uses …… -
Which class in Java implements the abstract class enumset?
I saw enumset Of() returns an instance of an object of type enumset Solution The following are two classes that extend…… -
Java – decimalformat deletes zeros after a dot
I want to format the user's input, it doesn't matter, but when I try to delete it by clicking decimal format, I enter ……