Java
-
Java – it is not a good practice to use arrays as parameters to return multiple values
I sometimes (actually, often) find myself using a single element array to return multiple values from a method Somethi…… -
Javac does not have openjdk-6-jdk installed
I've been trying out some different Java compilers over the weekend and decided to stick to javac this morning Then I …… -
Java – cannot inherit from final class
I just created my first Android library In another application, I want to extend a class from it But it shows an error…… -
Java ternary operators and setting circular index values
I have a loop that traverses the for loop of ArrayList If the condition is met in the for loop: >I delete the curre…… -
Java – byte constructor and byte Differences between valueof () methods
Byte byte1=new Byte("10"); Byte byte1=new Byte("10"); Byte byte2=Byte.valueOf("10"); System.out.println(byte1); Syste…… -
A list of all binary combinations of numbers in Java
I'm working on a project involving "dynamic programming". I'm shocked by this trivial thing. Please help Suppose I tak…… -
Java – ArrayIndexOutOfBoundsException when iterating through all elements of an array
How to handle this exception "ArrayIndexOutOfBoundsException" public static void main(String [] arg) { int [] a=ne…… -
Why does Java require char variables to use single quotes?
Why does Java require char variables to contain anything in single quotes instead of double? An example: char s = 's';…… -
Java – how to convert dates to UTC
I need to change the date format to UTC format … I need to convert the LastModified date of the file in UTC format Sol…… -
Java – is it acceptable to always use ‘this’ as a monitor lock?
For example, I have a class with 2 counters (in a multithreaded environment): public class MyClass { private int cou…… -
Java – why are different long values converted to the same date / time?
public static void getTime() { public static void getTime() { SimpleDateFormat sdf = new SimpleDateFormat( "yyyy-M…… -
Java – how to use asserttrue?
I have: package com.darlik.test; import org.junit.Assert; public class Test { public static void main(String[] …… -
Java – Android runs the functions in the class in a new thread
I have this Code: MyClass tmp = new MyClass(); tmp.setParam1(1); tmp.SetParam2("Test"); tmp.setParam3("Test"); ... The…… -
Can I use variables in Java to name variables?
What I want to do is have a loop each time to name a certain number of variables Therefore, sometimes when I run the p…… -
Where can I find Java main functions
Is public static void main (string [] args) a built-in or user-defined or overridden function of some classes provided…… -
Java – a simple leap year logic problem
public class LeapYear { public class LeapYear { public static void main(String[] args) { int year = Int…… -
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 – wait for all threads to complete before closing executors
This is a snippet of my code ExecutorService executor = Executors.newFixedThreadPool(ThreadPoolSize); while(conditionT…… -
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 …… -
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…… -
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…… -
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 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 – 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 – 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…… -
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 – NullPointerException when using customlistadapter
I created customlistadapter in Android appiclation But when I implement it, I get this error NullPointerException This…… -
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…… -
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 – 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…… -
Java – how to avoid instanceof calls?
I defined this simple method: public static boolean isBorder(int x,int y) throws CollisionDetectionException { …… -
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……