Java 归档 - Page 153 of 655

Java – null pointer exception on actionbar on fragmentactivity

I received this error while running Stack trace: 01-22 06:32:55.509: E/AndroidRuntime(3728): FATAL EXCEPTION: main 01-……

Java

2020-08-13

Casting – Java 8 – filtering collections with external parameters

I have an animal map containing specific successors MyBaSEObjectAnimalMap.values().stream(). filter(x -> x ins……

Java

2020-08-13

Get a random subset from the result set in Java

I have a set of 100 objects I'm doing this now, but it only returns one object int size = memberSet.size(); Set&……

Java

2020-08-13

Java – this method must override the superclass method

I recently updated my computer to Ubuntu 11.10 64 bit I had a problem importing the project and it gave me an error "O……

Java

2020-08-13

Java null corresponds to double

I don't know how to raise the question or what title to use I hope I don't break any rules Anyway, can someone explain……

Java

2020-08-13

Doctrine ORM – doctrine 2 case sensitive queries

For some reason, I need to query "case sensitive" 2 in MySQL principles Is it possible? either $em->find('UserEn','……

Java

2020-08-13

My java if statement doesn’t seem to work

I don't know why, but when I use zxing to get barcodes in my Android application, the format is returned as EAN_ 13 bu……

Java

2020-08-13

Java – decimal conversion error

I'm writing a program to convert octal numbers to decimals It compiles correctly and everything, but my conversion cod……

Java

2020-08-13

Java – which method in jsoup can return modified HTML?

When I use jsoup to parse HTML files (stored locally) I modified some elements in the HTML file, so I want to save the……

Java

2020-08-13

Java – uses an object as a variable in the constructor

I have a question about using objects as variables in constructors It may be simple, but I really can't think of what ……

Java

2020-08-13

Java – returns a static HTML without redirection in spring

So I want to return to the HTML page without sending a redirect The reason is that the URL in the browser is changed b……

Java

2020-08-13

Java – @ postconstruct is called multiple times for the @ conversationscoped bean

I have a @ conversationscoped bean with a start method, as follows: @postconstruct public void start() { if (conve……

Java

2020-08-13

How to update tableview items outside JavaFX thread

I have a table view of list user friends. I need to update it every 5 seconds with the data I retrieve from the databa……

Java

2020-08-13

Java – why not call the constructor of the class that implements the runnable interface?

I try to use the constructor of the class that implements the runnable interface But I was surprised to find that it h……

Java

2020-08-13

Each time the new operator is called, Java creates a new object

In Java, when we call a new constructor (), a new object will be created each time, that is; Allocate new memory or as……

Java

2020-08-13

Java – warnings when using reflection and generics

How can I rewrite: <T> T callMethod(String methodName,Object[] parameters) throws ... { ... return (T) S……

Java

2020-08-13

Java security class cast exception

Hi, I'm a beginner of Java security. I encountered the following problems when calling: Cipher cipher = Cipher.getInst……

Java

2020-08-13

Java – is this singleton thread safe?

I have a singleton server instance, and I'm curious if my code is thread safe I've read for different singleton modes,……

Java

2020-08-13

Java file compilation with file extension

When we compile Java programs, we use javac file Java commands, but we use java files at runtime So why is it necessar……

Java

2020-08-13

Java – use auto assembled beans in objects created at run time

I have a class B that implements the w interface It has a default implementation of the W method Classes C and D overr……

Java

2020-08-13

Reusing resultset objects in Java

I'm working on a swing project I use JDBC ODBC connection bridge to access the data in SQL database I use the followin……

Java

2020-08-13

Java Swing Games perform poorly when many sprites are on the screen

I'm making a simple tower defense game in swing. When I try to place many elves (more than 20) on the screen, I encoun……

Java

2020-08-13

Java – pass enum member to constructor: “actual and formal parameter lists are different in length”

I'm confused. I think what I do is very stupid. I just can't see it! Central heating control: Radiator class and radia……

Java

2020-08-13

Java – simulate spring bean

I have the following courses: public class Plugin { private DistributionManager manager; public void init(){……

Java

2020-08-13

Java – compile errors using scanner

This is my current course: package Mathias; import java.util.*; public class Scanner { public static void main(S……

Java

2020-08-13

Java – how do I get the first five values from the linkedhashset?

I have a linkedhashset that contains multiple values LinkedHashSet<String> lhs = new LinkedHashSet<String>……

Java

2020-08-13

Java: how to use currenttimemillis() to obtain a long time and output it in X decimal places?

I have a representative system Long. Of currenttimemillis() Then I'll measure it later in the code I've subtracted two……

Java

2020-08-13

Java – stack multiple bufferedimages together?

I have multiple transparent buffered image instances. I want to stack them together (that is, Photoshop layers) and ba……

Java

2020-08-13

Shift right in Java

I just stick to this little logic. I didn't do it right Int is 32 bits, so assume that binary 20 is like // 0000000000……

Java

2020-08-13

Java – what is the value of a week?

I want to use two long values, system Currenttimemillis() is compared with the pre - recorded long I want to see if it……

Java

2020-08-13

Invisible GUI? (Java)(Swing)

I'm studying this program, using swing Every time I export the program and run it, I try to set up the GUI JFrame can,……

Java

2020-08-13

Use java to convert e-mail to its original format

I have been trying to create an object of mimemessage type using JavaMail API and get its original representation, but……

Java

2020-08-13

搜索内容

Java – null pointer exception on actionbar on fragmentactivity

Casting – Java 8 – filtering collections with external parameters

Get a random subset from the result set in Java

Java – this method must override the superclass method

Java null corresponds to double

Doctrine ORM – doctrine 2 case sensitive queries

My java if statement doesn’t seem to work

Java – decimal conversion error

Java – which method in jsoup can return modified HTML?

Java – uses an object as a variable in the constructor

Java – returns a static HTML without redirection in spring

Java – @ postconstruct is called multiple times for the @ conversationscoped bean

How to update tableview items outside JavaFX thread

Java – why not call the constructor of the class that implements the runnable interface?

Each time the new operator is called, Java creates a new object

Java – warnings when using reflection and generics

Java security class cast exception

Java – is this singleton thread safe?

Java file compilation with file extension

Java – use auto assembled beans in objects created at run time

Reusing resultset objects in Java

Java Swing Games perform poorly when many sprites are on the screen

Java – pass enum member to constructor: “actual and formal parameter lists are different in length”

Java – simulate spring bean

Java – compile errors using scanner

Java – how do I get the first five values from the linkedhashset?

Java: how to use currenttimemillis() to obtain a long time and output it in X decimal places?

Java – stack multiple bufferedimages together?

Shift right in Java

Java – what is the value of a week?

Invisible GUI? (Java)(Swing)

Use java to convert e-mail to its original format

Categories

Recent Posts

Tags