包含标签：Java 的文章
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Java – NoSuchElementException when finding a match in the list
The following old-fashioned, simple code works normally (traversing the string list and returning true because it shou…… -
Instance initializer in java interface
Hey, I wonder if I can initialize the interface when making the implementer It's like a blank constructor in an abstra…… -
Java, Apache POI, memory leak and excel file
I need to read (15000) Excel files for my thesis I'm using Apache POI to open them and analyze them later, but after a…… -
Java – how to sort HashMap entries by comparing values, where each value is int []?
I have a HashMap defined as HashMap < string, int [] > The value is int [], where there are only 2 numbers What …… -
Java 8 Lambdas and concurrent interpretation
I'm reading Lambdas in Richard Warburton's Book Java 8 Lambdas He began to discuss the use of concurrency in modern CP…… -
Java – how many calculations must a computer perform in a binary search?
Here, I have an array: {1,3,5,6,7,8,9,11,13,14,15} It's simple. However, we will use binary search to search the index…… -
Java – the cron expression of the spring scheduler – runs only once a year
I like spring service @Scheduled( cron="0 0 7 * * SUN") public void doSomething() { // do something } I know you …… -
Java – error while trying to run weld se application – weld se container failed to initialize – bean archive not found
I created a simple java se application using weld se :compileJava UP-TO-DATE :processResources UP-TO-DATE :classes UP-…… -
Java – use mockito to simulate enumeration?
I need to simulate the following enumeration: public enum PersonStatus { WORKING,HOLIDAY,SICK } This is beca…… -
Java – how to insert millions of data into a database
I tried to insert a million records into the database table I want to create at least three threads, each thread trigg…… -
Compilation of generic class using generic interface failed
As far as I know, the following code should run without any compilation errors However, when I run this program, I get…… -
Java – performance analysis using IntelliJ and debug in visualvm
I want to describe the test application launched by IntelliJ For analysis, I used visual VM I use the parameter - j-do…… -
Java – is the order of variables important in packet change read / write operations in Parcelable?
I have the following implementation of a Parcelable class: public class DemoModel implements Parcelable { private …… -
Java lambda – finds whether any string element of a list matches any element part of another list
I have two string lists A = {"apple","mango","pineapple","banana",... } B = {"app","framework",...} What I'm looking …… -
Java – algorithm – the largest left sub array with smaller elements
I'm developing a program. I need to get the index of elements in the integer array, so that all elements on the right …… -
Java – what is the difference between these generic statements?
See the English answer > is this raw type assignment type safe? List = new ArrayList(); 1 Map<String,Intege…… -
Java 8 option list collection list compilation error
I can't understand the difference Stream<Optional<Integer>> optionalStream = Stream.of( Op…… -
java – /google-play-services_ lib/AndroidManifest. XML parser exception: premature end of file
I'm trying to import Google play services into eclipse_ Lib, as they said in this tutorial（ http://developer.android.…… -
Traditionally, where do you store Java Class file?
I have a Java SRC folder where I store my Java file Then I use terminal to compile them and finally get them in the sa…… -
Java – replace the list of arrayadapters
I have a custom arrayadapter that uses ArrayList < orderedproductitem > For my listview In this listview, I have…… -
Java – how to protect yourself from parameter misalignment
Suppose I have this important method: int generateId(int clientCode,int dataVersion) { return clientCode * 2 + dat…… -
Java – JPA entities with collections return false to the contains method on detached members
I have two JPA entity classes, group and user Group. java： @Entity @Table(name = "groups") public class Group { …… -
Java – use jodatime to UTC to local time in milliseconds
I try to use jodatime to display transactions in a specific time period Our server requires the start date and end dat…… -
Java – unable to parse the import org. Org springframework. test. context. junit4. SpringRunner
I'm trying to solve this problem from now on But I still haven't solved it I just got out of spring IO downloads a spr…… -
Java – Android spinner has a different background for each line
I know this topic has been solved many times. I have found several such problems, but I can't meet my needs I want a l…… -
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Java – starts the enumeration as a value
I want to declare enumeration variables as values How can I do this? For example: public enum CardSuit { SPADE(0),H…… -
jsf-2 – javax. faces. Facesexception: public key for catpcha not found
I want to implement the verification code in my application, but I get this error. Can someone tell me the reason? Sol…… -
Java – sorted concurrentmodification exception
I wrote this applet to sort arrays According to my understanding, it should print 0,1,2 However, when I run this progr…… -
Java generics – a comparable interface
In the following code, the comparable interface is used to ensure that X and y should have the same reference type, bu…… -
Accessing private variables through static methods in Java
Suppose I have the following Java classes: public class A { private int x; public A(int x){ this.x…… -
What protocol does java socket use?
I started using the socket and socketserver classes in Java As mentioned above, I want to know which protocol (or what……