包含标签：Java 的文章
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Reduce map using java 8 stream API
I have a map of the following table: Map<Integer,Map<String,Double>> START Make inner an internal map, i.e…… -
java – JDK 1.4. 2 “contains (charsequences)” method in string class
In Java 1.5, the contains (charsequences) method was added to the string class This method How would you do this in Ja…… -
java – Jersey：com. sun. jersey. spi. inject. Errors $ErrorMessagesException
I'm having trouble using the Jersey (1.8), Maven and hibernate I received this error (full log) INFO: Scanning for roo…… -
Java NullPointerException for null condition check
I have a very basic method as part of the binary search tree. If the current binary node has a correct child node, it …… -
Base-n series generator for a given number in Java,
I want to create a program to generate a given base-n series, Is there any general mechanism to find these numbers so …… -
Which simulates the optional parameters in Java better?
I have a Java method with three parameters, and I hope it also has the fourth "optional" parameter I know that Java do…… -
Java program for factorial incorrect output
I execute the following java code in the eclipse ide public class Programs { public static void main(String[] arg…… -
Java – make jlabel disappear
I am writing an application to perform a task and notify the user when the task is successfully completed Inform the u…… -
Java – order and difference between HashSet and JDK 7 / 8
This is a two-part question: >Whether HashSet implements some hidden sorting mechanisms, or just references documen…… -
Java string format
I have a property file containing strings in the following format: audit.log.events.purged=The audit events were purge…… -
How do I force two Java threads to run on the same processor / core?
I want a solution that does not include critical parts or similar synchronization alternatives I'm looking for somethi…… -
Java 8 – restrict the flow of the first object and convert it to a specific object?
I used earlier: List<Person> person = UserDB.getUserDetails(); Person p = person.get(0); // index of first posit…… -
Java – how to use regular expressions to check whether HTML documents contain non empty script tags
I try to check whether an HTML document contains script tags that are not empty using regular expressions Regular expr…… -
The best way to translate this java code into kotlin
URL url = new URL(urlSpec); URL url = new URL(urlSpec); HttpURLConnection connection = (HttpURLConnection)url.openConn…… -
Duplicate code blocks in sonar for import statements in Java
On sonar 4.5 6 (default setting), I see the message duplicated blocks as The Java code of the message I received is as…… -
Java – converts two Boolean values to int
This can be very easy If I have two Boolean values a and B, how can I get the equivalent "binary" number? false and fa…… -
Java – refactoring a simple populated long method
I'm refactoring a method with more than 500 lines (don't ask me why) @ h_ 403_ 7@ public List<Hashmap> getProduc…… -
Java – why does my jdialogs leak?
I have a JFrame from which I open a jdialog and another jdialog – menas from the dialog. I have three windows visible …… -
Java – Tomcat server timeout in eclipse
I encountered a Tomcat server problem in eclipse I received the following timeout error: Server Tomcat v7.0 Server at …… -
Combining functions and predicates in Java 8
In the isbigorder method, if the total price of the products in the order is greater than 1000, it must return true Ho…… -
What is = =?
>Search this website, no references found int[] test = {0,1,2,3}; System.out.println("test1[3] ++== 0 is " + (test[…… -
Java: how to access jobs in try catch – loop?
This problem got me into a huge try catch loop I want smaller So how do I access assignments in a loop? $javac TestIni…… -
An attempt to use resources in a multithreaded server in Java
I'm reading a book "java networking 4th Edition" and Chapter 9 on server sockets, while explaining the multi-threaded …… -
Java – other languages in PHP and Hadoop / MapReduce implementations and other languages in the cloud
I began to learn some Hadoop / MapReduce, mainly from PHP background, and only need some Java and python However, it s…… -
Lambda – converts the string list to a sorted map string length as the key
I have a list < string > and I have to convert it into a map. By grouping strings of the same length into a list…… -
Java – how do I know what exceptions can be thrown from a method?
How do I know what exceptions a method call might throw? Solution Look at the throws clause of the method signature to…… -
Java – call again: < >
What's this called? List<String> ids = new ArrayList<String>(sectionIDs); (< > section) I know this …… -
Java – Custom swing components: questions about methods
I'm trying to build a new Java swing component. I realize that I may be able to find something that can meet my needs …… -
How to add a thread and other threads in Java?
I have a main thread to start 10 other threads I want to finish the main thread only after all other threads stop So I…… -
Why should I use null (string []) in Java?
In some fragments, I noticed that the array is initialized by converting null values into string arrays, such as: Stri…… -
How to round 0.0 to 0.00 in Java?
I use the following functions float val=0.0; DecimalFormat toTheFormat = new DecimalFormat("#.##"); float value=Float.…… -
Java – find coordinates in circles
I'm using Google maps under Grails for mashup. Users can create geonces by selecting points and radii on the map This ……