Recent questions tagged java

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java - How to print multiple header lines with MessageFormat using a JTable

I have a table called table and its filled with data, I also have a MessageFormat header I want to use as a ... but that doesn't seem to work. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to run PING command and get ping host summary?

Hi I need to execute the PING command using Java code and get summary of the ping host. How to do it in Java? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - IntelliJ GUI Designer Maven Executable JAR Export

I'm using IntelliJ IDEA's GUI designer and Maven as build system. When I build the executable JAR file via ... with IntelliJ's GUI designer? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Autowired Repository is Null in Custom Constraint Validator

I have a Spring based webapp. I am using several repository classes with annotations @Repository, @Transactional in my ... my question. Thanks! See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Convert a JPanel to an image in a JScrollPane

I want to convert an JPanel to an image. I used the following method: public BufferedImage createImage(){ int w ... the JPanel into an image? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - how is paint() running without being called in the main method?

This is a beginner question for java graphics using the awt package. I found this code on the web to draw some ... the paint() method being run? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Reading an image in Netbeans

I have an image file in my project. The hierarchy looks like this: I'm trying to read Manling.png into Manling ... , using any image you want: See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Convert byte[] to image and display on jsp

I'm trying to display an uploaded picture (which is now a byte array) on a jsp page. Now, the byte[] ... needed, please let me know. Thanks. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Regex to match at least 2 digits, 2 letters in any order in a string

I'm trying to create a regex to pattern match (for passwords) where the string must be between 8 and 30 characters, must ... )(?!.*[\s]))^.* See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Should I add both JAVA_HOME and JRE_HOME in environmental variable, PATH?

I ran into this error while setting up my Tomcat and Java environmental path: Neither the JAVA_HOME nor the ... to the system variable also? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - JVM option to optimize loop statements

I've been told at school that it's a bad practice to modify the index variable of a for loop: Example : for ... not even call once in this case. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - What is the difference between Collectors.toConcurrentMap and converting a Map to ConcurrentHashMap via Collectors.toMap supplier option?

I want to convert a Map into a ConcurrentHashMap via Java 8 Stream and Collector interface, and there are two ... should I use each option? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - HashSet usage with int arrays

As I have an ArrayList of int arrays which contains duplicates, I'd like to use HashSet. Unfortunately, I ... advance Dominique (java newbie) See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Struts2: method attribute in <s:submit> button doesn't work

I have a form in jsp. There are two submit buttons: "Search" and "Add New" button. I had set each button with ... above? I'm using struts v2.3. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How do I pass information from a servlet to a JSP page

Is it possible to have a servlet that contains an object (an ArrayList in this case) that then does the ... the basic Servlet/JSP architecture. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - File upload with okhttp

Im finishing this project which is using okhttp for communication with a webservice. All is going fine for regular ... all strings and ints. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Is CompressedClassSpaceSize area contains MaxMetaspaceSize area?

What is CompressedClassSpaceSize? What is the relationship between CompressedClassSpaceSize and MetaspaceSize? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Read directory inside JAR with InputStreamReader

So, this question has been asked a million times i believed and I've been reading them for a couple of hours and ... . How can I do this??? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to set and get static variables from spark?

I have a class as this: public class Test { private static String name; public static String getName() { return ... global variable and use it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - XmlJavaTypeAdapter not being detected

Hopefully an easy one for JAXB experts: I am trying to marshal an immutable class that does not define a default no- ... am using JDK 1.7.0_05. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Having trouble implementing ACTION_OPEN_DOCUMENT to my project

I have AddActivity, which lets you get the URI from either a picture you can take from the camera, or an image ... to apply this to my project? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Hibernate noob fetch join problem

I have two classes, Test2 and Test3. Test2 has an attribute test3 that is an instance of Test3. In other ... alter table A add index FK412E010759 (b_id), add constraint FK412E01...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - how to do ssl socket programming

I am doing socket communication through follwing IP address it working but no i want to do communication in ssl mode but how ... ", e); } } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Cannot connect to localhost API from Android app

I am new to Django. I have created an API named http://127.0.0.1:8000/api/update/1/ and it works ... help me with this? Thanks in advance. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to call a method function from another class?

I'm writing a java project that has three different classes. This is what i have have so far. I'm just stuck ... +"low"; return rTempRange; } } See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring autowire interface

I have an Interface IMenuItem public interface IMenuItem { String getIconClass(); void setIconClass(String iconClass); ... of the constructor ? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Make Enum.toString() localized

I'm developing an Android application and I want to know if I can set Enum.toString() multilanguage. I'm going to ... you know how can I do it? See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to convert decimal to fractions?

What I need to convert decimal to fractions. It is easy to convert to 10's feet. 1.5 => 15/10 This can ... related question is C#. This is java. See Question&Answers more detail:os...

asked Oct 17, 2021 in Technique[技术] by 深蓝 (71.8m points)

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