Java
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Find substrings in strings in Java
I'm writing a program to find substrings in strings in Java without using any Java libraries I wrote a function substr…… -
Java – quicksort partitioning algorithm
I'm trying to write a quick sort algorithm using the cormen algorithm textbook Here is my code class Quicksort { p…… -
Java – replace decimals 1 to 10 with names (“one”, “two”.)
I try to take a string and then return a string of numbers 1 to 10 and replace it with the words of these numbers For …… -
Java – why can’t I add the first header to getpreferencescreen?
The standard setting activity from Google Android studio now displays the first title "general" So I modified the code…… -
Verify java version compatibility
I have a jar file compiled with JDK 1.7. I want to check whether the Java runtime environment of my jar is 1.7 or upda…… -
Java – NullPointerException reflected when robolectric starts – any hint?
I'm developing an Android project on eclipse and I'm trying to switch from running tests on the simulator / device (ve…… -
Is there a Java enum in European countries and languages?
Are there any Java (> 5) enumerations for listing European countries and languages somewhere? But if I can avoid th…… -
Java – (simple) dateformat, allowing 24:00:00 and 00:00:00 as input
I've been looking for this, but I haven't succeeded so far Do you know if there is a "dateformat" ish class, which wil…… -
Java – you can specify an integer value for char, but you cannot assign an integer variable to char
Why not compile the following code int n = 5; char c = n; But the following compilation char c = 5; In both cases, don…… -
Java – when to use doget, dopost, and service
See English answers > doget and dopost in servlets5 >Dopost has no limit on the number of parameters, while doge…… -
Java – Functional Programming: how to handle exceptions or their equivalents in functional programming
Let's say I have the following code public int divide(int dividend,int divisor) { if( divisor == 0 || (dividend ==…… -
Java – why are variables allowed to be declared in a for loop?
I'm a student. I'm learning java at school. I'm confused about it That's what I mean: for (int i = 0; i < 3; i ++) …… -
Java – find a simpler way to prime than this?
Is there a more effective, cleaner / more elegant way to find primes? The code works normally, but I just wrote some o…… -
Rewriting conditional statements in Java
Suppose I have the following code, which basically determines some condition matches, then assigns Boolean values, and…… -
Java – view global / static / inherited variables in the eclipse debugger
This is a little trouble for me, rising When I debug the program, I can see the variables in the direct scope, but I c…… -
Multithreading – the sender becomes an actor [akka: / / main / deadletters]
I can't figure out why I made a mistake "dead letters" class MyActor extends Actor { private def getIdList = Future…… -
Java – how to reference / handle “this” before the constructor ends?
I think the specific usage of this problem is as follows, but it is more common I have a custom JFrame class, which ca…… -
Java HTTP post request UTF-8
My J2EE application can receive post requests from JSP pages, no problem But if I send a post request using another Ja…… -
Java – add external in eclipse Jar file
I'm adding a download for a java project There was a problem with the jar file This is really my first time using ecli…… -
A complete switch of enumeration in Java will result in a “missing return statement” error
Suppose we have a switch statement, which completely covers all possible cases of enumeration parameters, and also car…… -
Java – pass an argument instead of returning it from a function
It is clear from the title which method should we adopt? The intent is to pass some method parameters and get the outp…… -
Java – why can variables be declared without an initial value?
I'm reading Gilles Dowek's programming principles: He said that it is also possible to declare a variable without givi…… -
Java – why is it faster to iterate buckets in linked HashMap than HashMap?
It's hard for me to understand that Google search, I found and If this is the case, why does the only HashMap have to …… -
Is there something similar to the spring @ transactional annotation available in Java EE 6?
In my company, I do not encourage the use of spring framework, but promote Java EE 6 But recently I read about the spr…… -
Java – the target fragment declared by the fragment does not belong to this fragmentmanager
I did an activity a, in which there is a fragment X. through fragment x, edit and click the text item on the event. I …… -
Java – how to iterate over lists such as list >
I have a method to return list < map < string, Object > > How to iterate like list < map < string, O…… -
Java – how does this cause deadlocks?
I was brushing my java and was asked this question in the exercise How can the following cause deadlock? private Objec…… -
Convert int to object in Java
I have a problem: I work in an eclipse environment Sometimes the computer does not give the following conversion: int …… -
Java – how to set a custom object in the JTable line
I should first tell it that this is not about rendering table cells This is the tablemodel I'm building using a 2D arr…… -
How to get the logical part of a sentence in Java?
Suppose there is a sentence: On March 1,he was born. Change it to He was born on March 1. Without breaking the meaning…… -
How do I get string values from ArrayList and store them in a comma separated single string in Java 8?
I have an ArrayList with some strings I want to store the list of numbers in ArrayList in a single string separated by…… -
Why are Java generic type parameters not implemented at run time?
My understanding is that C # and Java differ in some aspects in terms of generics. One of them is that generic type pa……