Recent Posts
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Java – why does hashcode () return the same value for an object in all successive executions?
I try some code about object equality in Java As I read somewhere Now I have a sample program that I run 10 times in a…… -
Java – how to get the depth of the current node in JTree?
I have a JTree with several nodes and children When I click on a node, I want to know its depth (0,1,3) How should I k…… -
Java – JSF CDI: dialog scope bean [S] best practices
I am currently learning JSF 2.0 and am very happy with the existence of this session scope function, which is very use…… -
Java – cannot set setvisibility() parameter dynamically
I am setting the visibility of a button as follows: public Bundle setActivityState(Bundle bundle){ startBtn = (But…… -
Java – interruptedexception cancel file open dialog box – 1.6 0_ twenty-six
The output of the following code is: java.vendor Sun Microsystems Inc. java.version 1.6.0_26 java.runtime.versi…… -
Java – what is the Maven coordinate of the Tomcat JDBC connection pool?
What is the Maven coordinate of Tomcat JDBC connection pool? Solution Through the improved search function on the Mave…… -
How do I convert a string to a Java 8 character stream?
I found that this question is about getting Java from a Java string util. streams. Intstream, but I haven't found this…… -
Java – get wrap_ Content height
My goal is to animate an invisible linear layout when a specific button is clicked To do this, I set the default heigh…… -
java-ee – Web. XML: invalid content found starting with element JavaEE
I encountered this error on the eclipse ide <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http:/…… -
Java – JSF CDI: dialog scope bean [S] best practices
I am currently learning JSF 2.0 and am very happy with the existence of this session scope function, which is very use…… -
How to suppress the “picked up java_tool_options: – javaagent: / usr / share / Java / jayatanaag. Jar” message
I use Ubuntu 15.04 and Java 1.7 After updating to 15.04, whenever I enter any Java command, I will receive the followi…… -
Java – executable can be called Jar file instead of using its full path?
I have one Jar file, I want to be able to call it without using the full file path to its location For example, if The…… -
Return ArrayList from WebService in Java
I have a problem returning ArrayList from Web Service (Java) I have written a test web service and client that consume…… -
Java – what is the Maven coordinate of the Tomcat JDBC connection pool?
What is the Maven coordinate of Tomcat JDBC connection pool? Solution Through the improved search function on the Mave…… -
Java – interruptedexception cancel file open dialog box – 1.6 0_ twenty-six
The output of the following code is: java.vendor Sun Microsystems Inc. java.version 1.6.0_26 java.runtime.versi…… -
Introduction to Java graphics library
I have just entered information visualization and scientific visualization and have used Piccolo and some with JfreeCh…… -
Java – how to insert batch generated keys from JDBC into oracle?
I use JDBC to batch insert many records I'm using Oracle jdbc. OracleDriver final String insert = "Insert into Student…… -
Java – is there any 2D game engine better than libgdx?
I started programming with libgdx a few months ago, and I found many basic tutorials I like the cross platform nature …… -
Java – lists all possible subsets
I have a list of elements (1, 2, 3), and I need to get a superset (no duplicate elements) of the list So basically I n…… -
Java – liquibase inserts bit column, mysql, column with too long data
In liquibase, I define a table with a column of type bit (1), <changeSet author="foobar" id="create-configuration-t…… -
Java – timer – how to calculate the difference between two dates using joda time?
I want to use joda time to get the difference between P (start time) and Q (end time) twice P and Q may be different d…… -
Java – after reasoning, l must be specified as long, F and D as float and double
Here are a few related questions According to the title, why should you specify the variable type as long or float, do…… -
Java – custom string class creation
I tried to use Java. Net in my eclipse workspace Lang package to create a custom class string Now I'm confused 1) why …… -
Why does the same code work differently in Java?
I wrote the following code in Java and C, but the output of these programs is different Can you describe it This is ja…… -
Java – spring boot: persistence cannot be used
I've entered this stage, and - although I'm learning a lot - I'm starting to despair I've tried all the suggestions on…… -
Java – soap WS – make @ webparam optional
I have a very simple method. I use jax-ws annotation in WS API: @WebMethod public MyResponse sendSingle2( @WebPara…… -
Java – what is digital promotion?
Can anyone tell me what digital promotion is? Solution Number promotion is to convert a smaller number type to a large…… -
Java – templates in spring MVC web applications
I have many common areas in my web application design, such as footnote, title, sidebar, block... And change some thin…… -
Java immutable classes are much slower
I need some complex math libraries, so I hesitate to use immutable complex libraries and variable complex libraries Ob…… -
Pop up and start JPA2 hibernate – enable L2 cache
I use spring boot 1.2 5 and JPA 2 annotation entities (and Hibernate as the underlying JPA Implementation) I want to u…… -
1 field of multiple regex @ patterns?
I tried to apply multiple @ pattern annotations to a single field: @Pattern(regexp = "(?=.*[0-9])",message = "Password…… -
Java – how do I get all the files indexed by Lucene?
I created a Lucene index I want to get all the files, just sort according to the fields, no search criteria! Solution ……