Recent Posts
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Java – what is system in
Consider this scanner input example Scanner user_input = new Scanner( system.in ); The scanner is class user_ Input is…… -
Java – what is better shallow or deep cloning?
I'm a little confused about object cloning in Java What is the main difference between shallow cloning and deep clonin…… -
Java multi-level inheritance – protected instance variables in level 1 classes
I have a problem with multi - level inheritance in Java All three classes are in the same package I have class A: publ…… -
Java time implementation
package timeToys; package timeToys; import java.util.regex.Pattern; ** * A DayTime is an immutable object that sto…… -
Java: generic filter mapping function
I'm trying to develop a general function to filter maps My code so far is: public static Map<?,?> filterAttrs(Ma…… -
Java – Android studio autocomplete
I just switched to Android studio, and even with a few errors, I think it's much better than eclipse However, somethin…… -
Java – use thread. Java in my main code currentThread. Is sleep () dangerous?
In my code I'm using Thread.currentThread().sleep(sleepTime); In the main (non thread object) part of the code It seem…… -
Thread contention in Java
I want to know the following procedure If I call new readerthread() Start() it works normally, but if I call new reade…… -
Java Native array length
I have a 2D binary array in Java. It is basically a value table. I want to know how many rows it has It declares elsew…… -
What is the scope of Java variables in the block?
See English answers > why does Java not have block scoped variable declarations? 6 void foo(){ int a = 0; f…… -
java – @Override on Implementation
Will you put comments in the implementation class methods? Is it useful? If you input wrong or no input, it is a compi…… -
Java – what is the purpose of using aslist?
I just want to know the benefits and purpose of the aslist () method in arrays It returns a fixed size list supported …… -
Java – get random numbers from ArrayList?
ArrayList<Integer> lista = new ArrayList<Integer>(); ArrayList<Integer> lista = new ArrayList<I…… -
Java – Maven compilation does not create class files
I have a 3-module Maven project with the parent POM When I run Maven clean compile test from the parent process It fai…… -
How to use java to move the mouse smoothly across the screen?
There is a MouseMove () method that causes the pointer to jump to that position I want to be able to move the mouse sm…… -
Java – how to print arrays easily?
See English answer > What's the simple way to print a Java array? 32 System.out.print("["); for(int i = 0; i < a…… -
Java – how to avoid instanceof calls?
I defined this simple method: public static boolean isBorder(int x,int y) throws CollisionDetectionException { …… -
Java – generate WADL from existing CXF rest Service
I implemented Jax - RS service with CXF How can I generate WADL? Or is there anything like http://path.to.your/restapp…… -
RxJava`Completable. Andthen ` no continuous execution?
I have a use case. I initialize some global variables in a completable and use them in the next step of the chain (usi…… -
Java – how to sort hash map list
I have a HashMap list, as shown below ArrayList l = new ArrayList (); HashMap m = new HashMap (); m.add("site_code","A…… -
Java – NullPointerException when using customlistadapter
I created customlistadapter in Android appiclation But when I implement it, I get this error NullPointerException This…… -
Call the child method when converting to the parent type in Java
I am trying to complete some course work. Any help will be appreciated! I have three types of accounts that extend the…… -
Java – style EditText for Android
I ran Android 2.3 on my phone and noticed many applications that use ICs to edit text fields, such as square up and Tu…… -
Java – when using thymeleaf, the spring security sessionscope appears to be null
When the login fails with spring security, it will throw an exception and display it in my JSP, as shown below: <c:…… -
Java static method parameters
Why does the following code return 100 1 1 instead of 100 1 1 1? public class Hotel { private int roomNr; public Hote…… -
Java integer ArrayList returns elements in a specific range
I have an integer Java ArrayList ArrayList <Integer> ageList = new ArrayList <Integer>(); I have some int…… -
Java – using transformers. Java in Hibernate Aliastobean populates sub beans
I have the following beans: Address { String name; String number; String zipcode; String town; } MyEn…… -
Accessing private collection fields in Java
One of my classes has a field containing set This field is only populated in the constructor and then read by other cl…… -
Is there any way to declare a method “friendly” in Java?
I know you can set the property to public, friendly or private to specify its visibility Is there any way to announce …… -
Java – wait for all threads to complete before closing executors
This is a snippet of my code ExecutorService executor = Executors.newFixedThreadPool(ThreadPoolSize); while(conditionT…… -
How do we divide integers into vectors in r that make up numbers
I think an example should make things clear I have I would like some_ 1 to the following a_ Function of 2 Solution Con…… -
Java – a simple leap year logic problem
public class LeapYear { public class LeapYear { public static void main(String[] args) { int year = Int……