Java
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Java – instantiate ArrayList by reading rows from scanner, where to declare objects?
I want to fill the array list with lines from the input file, which is as follows: 7f000000000000000000000000000000000…… -
Java – Jackson captures unrecognized fields in the map
I use Jackson in Java rest API to handle request parameters My class: public class ZoneModifBeanParam extends ModifBea…… -
Java – spring startup projects imported in IntelliJ do not work
I have imported the spring boot project generated by the spring boot initialiazr website, and I can't find the spring …… -
Java – 25 even and even random number generator
I need to generate 25 random numbers and divide them into two arrays, depending on whether they are odd or even This i…… -
java – android. support. v7. app. ActionBarImplICS. Getthemedcontext NullPointerException in Android
Please help me get Java lang.NullPointerException java.lang.NullPointerException at android.support.v7.app.ActionBarIm…… -
Java – spring boot gradle – where to place the environment configuration?
I am using a simple application in spring boot It is developed locally (and effective): >Gradle, > H2 database, …… -
Java-8 – sum and max values in a single iteration
I have a list of custom callrecord objects public class CallRecord { private String callId; private String aN…… -
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 – (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) …… -
Java – replace the list of arrayadapters
I have a custom arrayadapter that uses ArrayList < orderedproductitem > For my listview In this listview, I have…… -
Java – Apache ignite node failed: unable to read magic header
The Apache ignite server deployed on both computers will shut down automatically There is no specific clue in the log …… -
Mutli thread in Java
When I'm at @ L_ 502_ There is a synchronized method in 0 @ and if multiple threads (such as 10 threads) try to access…… -
Multithreading – how to control multithreading synchronization in Perl
I have an array of [A-Z, A-Z] ASCII numbers, as follows: my @ alphabet = (65.. 90,97.. 122); So the main thread functi…… -
Java – in dataflow 2 X is the easiest way to convert a tablerow to a string in JSON format?
If I don't write my own function to complete it, then in data stream 2 What is the easiest way to convert a tablerow o…… -
Java – confused with constructors and subclasses
I can't understand the concept of using constructors with classes This is the parent class: public class A { publi…… -
How to delete a folder containing other folders in Java?
See English answers > delete directories recursively in Java 23 import java.io.*; public class file03 { public …… -
Java – play location service getlastlocation returns null
I'm trying to listen to location changes, but sometimes the onlocationchanged callback is never called, getlastlocatio…… -
Java – the spring boot cannot parse placeholders in strings
I run spring boot on the embedded Tomcat server through Maven and MVN clean install spring boot: run But every time I …… -
Java – ArrayList to array conversion – toarray() function infers that the type does not meet the upper limit error
This is the code simplet: Excel excel = new Excel(); ArrayList<Integer> a1=excel.readExcelSheet("C:\\Users\\Madh…… -
How do I scroll down to click an element in Android using appium and Java?
I wonder how to scroll down to click an element in Android using appium and Java? I have a list of elements in "Androi…… -
Java – eclipse / ant creates a jar in version 1.9, even if everything seems to be set to 1.8
I have a project built using ant and eclipse, and I want it to be compatible with Java 8 When I try to run jar using j…… -
Java – split image into parts
I know there are many topics about this, but none really suits me The image should be saveable I tried bufferedimage, …… -
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 – 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…… -
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 …… -
Java – how to protect yourself from parameter misalignment
Suppose I have this important method: int generateId(int clientCode,int dataVersion) { return clientCode * 2 + dat…… -
Java – where to place the properties file in eclipse and how to access the path locally and on the server
I see some similar questions here, but I don't know much about them, so I want to ask questions and customize them in …… -
Java – use JUnit test in Android studio of firebase
I want to write unit tests for this class in Android studio, but due to the use of firebase, I have a problem creating…… -
Java – the word reversion of a string
I want to reverse the words in the string I try to do it like this: public String reverseWords(String str) { Strin…… -
Multithreading – Delphi Seattle 10, multithreading / core performance
I have a 100% Delphi code application It is a 64 - bit windows console application with workload manager and a fixed n…… -
Java – why does the heap memory usage graph look like this?
I have installed glowroot (Java application monitoring) for my JVM When my application is idle, I get this form of mem…… -
Java – replace the table name in the SQL query and the escape characters around the column name
for example query = " select "2017-06-08" as new_colum,"true" as my_flag,"column1","column2" from "table1" " The above……