Java
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Java – write a method to replace all spaces in a string
I have a question about programming, starting with gayl laakmann McDowell's "cracking the code interview" in the fifth…… -
Java 8 lambda api
I'm trying to migrate from RX java to Java 8 Lambdas An example I can't find is the method of buffering requests For e…… -
java – Optional. Ofnullable and method links
I'm interested in optional The ofnullable method surprised me One day I wrote a function that should return an optiona…… -
Java – getters / setters of classes with maps
What are the best practices for implementing / providing getters / setters for courses with maps? The most common impl…… -
Java – get the Maven version of the project programmatically
How do I programmatically get the Maven version of my project? To put it another way: static public String getVersion(…… -
Java – sometimes it takes 45 seconds to close RandomAccessFile
In my program, close Java util. RandomAccessFile sometimes takes 45 seconds (almost exactly between 44.998 and 45.003 …… -
java – org. junit. Assert. Assert is better than org hamcrest. MatcherAssert. assertThat？
I am new to JUnit and hamcrest and want best practice advice, so I can decide which documents to study first For begin…… -
Java – contains type inference for return types, wildcards, and cross types
I'm trying to declare an interface that contains a method that will return an implementation comparator < Object &g…… -
Java – name a loop
While browsing through questions and answers on this forum, I found that a piece of code was given loops to use them f…… -
Does the java compiler optimize repeated mathematical calculations?
The java compiler optimizes simple repetitive mathematical operations, such as: if (prevX / width != curX / width) { …… -
Java – escape in FreeMarker by default
In the FreeMarker template, we can use the escape instruction to automatically apply escape to all interpolation in th…… -
Extend a Java ArrayList
I want to extend ArrayList to add several methods for a specific class, and its examples will be saved by the extended…… -
Java – Hibernate: delete many to many associations
I have two tables associated with many to many – DB segment: Load ID name Meeting Id date sessionsloads LoadId SESSION…… -
Mp3 coding in Java
I need an opensource API in Java that can convert * WAV and * Au format is encoded as MP3 and vice versa I have evalua…… -
Java – polymorphism of member variables I know it’s impossible. I don’t understand the specific situation
I know this behavior, but I'm not 100% sure why it happened class Animal{ String name = "Animal"; public voi…… -
Java – how to extract values from JSON
I get a response string from the server, as shown below {"name":"Json","detail":{"first_name":"Json","last_name":"Scot…… -
Java – Atomic increment of long variables?
If the long variable is declared as: – Long counter = 0; Now, if I use the pre increment operator to increment it, is …… -
Logical solution algorithm (applicable to Sudoku in Java)
I have a problem with my logic algorithm It solves the problem of a large number of hints, which is only a problem wit…… -
Java – can jmenubar be added to the decoration window of JFrame?
I want to know if I can add jmenubar to the decoration window of JFrame or jrootpane, or if I can include the border i…… -
Java – used to define the disadvantages of non static recorders
How do you reduce Java logging boilerplate code? It is strongly recommended not to use recorders as instance member va…… -
Maintain the map (Collection) of inserted orders in Java
I need to use maps for Android Application in Java But the problem is that the list is sorted automatically How to use…… -
Java – partial JSON serialization at runtime (for restful queries)
I'm trying to convert Java objects in Tomcat to JSON (currently using Jackson) Based on the fields in the restful requ…… -
Java – warn: failed to register destroy callback
This warning message appears a lot in my log For each managed bean, as long as it expires After the given time, becaus…… -
Java – convert a for loop to a concat string of a lambda expression
I have the following for loop to traverse a string list and store the first character of each word in StringBuilder I …… -
Java – why is “multiplexing, non blocking I / O, […] more scalable than thread oriented, blocking I / O”?
I was reading the channel in the JDK 7 document (here) and came across: Is there a simple explanation why? Solution "B…… -
Java – is the root cause of log4jlogger missing or unavailable?
I have commons - logging in the classpath Jar (v1.0.4) and log4j-1.2 8. Jar and get the following runtime error: Cause…… -
Java – is the first element of an array returned using split always safe?
I'm sure the answer is yes, but I just want to make sure that no non empty string (whatever it contains) will return a…… -
Example of MD5 encryption algorithm of Java irreversible encryption algorithm
The full name of MD5 is message digest algorithm 5. Message digest generally refers to the hash transformation of byte…… -
Java generates and parses instance code for XML format files and strings
1. Basics: there are generally four methods for parsing XML in Java: DOM, sax, JDOM and Dom4j. 2. Introduction to DOM …… -
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Java network programming identification example to obtain the host network interface list
Get host address information In Java, we use the InetAddress class to represent the target network address, including …… -
Example of finding text content replacement function in Java
Idea: First look at the view layer. There should be a JButton control to select the file, a jtextfield control to disp……