Recent questions tagged JAVA

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I have a problem with JButton in Java. Basically, I want to disable the button's border (the button is added ... (with a light-blue background)? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Unable to put null values in JSON object

I am trying to pass parameter to api using JSON. class Sample { ... String token; ... void method ... that uninitialized value are not included? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Velocity string function

I just start using Java Velocity. Now I want to create a java class template. package $app.package_namespace public class ... know how to do it? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Default for XX:MaxDirectMemorySize

What is the default value for XX:MaxDirectMemorySize? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How can I get the "Eclipse >Generate>Jaxb classes" option back?

I recently had to migrate to a new machine and re-installed Eclipse. At the moment, I need to generate JAXB classes from ... .6 and Java SE 1.6. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Correct JPA Annotation for PostgreSQL's text type without Hibernate Annotations

I'm developing an application using: Java 1.7 JPA (included in javaee-api 7.0) Hibernate 4.3.8.Final ... /hibernate.atlassian.net/browse/JPA-48 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Will not closing a stringwriter cause a leak?

I realize that in java the GC will eventually cleanup objects, but I'm asking if it is bad practice to not close ... ; } Is this better to do? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to handle "any other value" with Mockito?

I have an interface Foo with method int Foo.bar(int) that I want to mock with Mockito. I want the mocked method ... the other is just a value? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Error: "setFile(null,false) call failed" when using log4j

I have added log4j.properties file in source folder of project but I am still getting a log4j:error. Here is ... I got the above exception. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to reuse existing JUnit tests in another test class?

how can I reuse JUnit tests in another testclass? For example: public TestClass1 { @Test public void testSomething() ... test something else } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Test default value and setter in same test-case or separate test cases

Would you recommend doing any grouping of test cases within @Test methods, or have one @Test method per test ... feedback would be appreciated. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - Spring mvc Ambiguous mapping found. Cannot map controller bean method

I am trying to build an app which can list some values from the database and modify, add, delete if necessary using ... <scope>test</scope> </dependency> <dependency> <groupId>java...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to suppress specific Kotlinc/Javac compiler warnings?

How to suppress deprecations in for KotlinCompile in Gradle similar to JavaCompile? JavaCompile(works): tasks.withType( ... warnings as errors? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - SINGLE_TABLE inheritance strategy using enums as discriminator value

Is it possible to use an enum as a discriminator value when using SINGLE_TABLE inheritance strategy? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to automatically convert if-else if statement to switch

Is there a hot key or easy way to replace an if-else if statement with a switch in IntelliJ? I would prefer ... of keys or use a menu button. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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255 views

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java - Methods visibility in interface

Do all methods in an Interface has by default Public visibility mode? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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411 views

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java - Which tag should be used as paragraph separator in Javadoc?

Which is the more appropriate HTML tag for breaking up paragraphs/long sections of javadoc so according to best practices? ... or <br />? Why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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374 views

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java - Is there a way to force the return type of Arrays.asList

I have a method returning a collection of a base class: import java.util.*; class Base { } class Derived extends Base ... a ')' at the comma. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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389 views

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java - $null check in velocity

I came to know about null check using $null in velocity 1.6 through a resource updated by you. Resource: ... velocity. Thanks in Advance lucky See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to specify a target package for ANTLR?

If I call: java org.antlr.Tool -o outdir sources/com/example/Java5.g ...with antlr-3.1.3 the parser and ... a way to specify the target package? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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241 views

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java - Does instanceof return true if instance of a parent?

I have a class Child that extends Parent. Parent child = new Child(); if (child instanceof Parent){ // Do ... returns true or false, and why? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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243 views

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java - static imports in c#

Does C# has feature like Java's static imports? so instead of writing code like FileHelper.ExtractSimpleFileName( ... method from FileHelper. See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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454 views

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java - Inheritance in protocol buffers

How to handle inheritance in Google Protocol Buffers 3.0? Java equivalent code: public class Bar { String name; } public ... { string id = 2; } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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512 views

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java - Rounding Bigdecimal values with 2 Decimal Places

I want a function to convert Bigdecimal 10.12 for 10.12345 and 10.13 for 10.12556. But no function is satisfying ... ::10.12 10.12556::10.12 See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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java - How to return a list of keys from a Hash Map?

I'm currently trying to make a program that conjugates verbs into Spanish. I've created a Hash Table that contains ... way to go about this? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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368 views

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java - Intellij maven project Fatal error compiling: invalid flag: --release

I am trying to start with Spring-boot, Maven in Intellij Please help me I am getting the error: [ERROR] Failed ... /plugins> </build> </project> See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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363 views

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java - How to do an instanceof check with Scala(Test)

I'm trying to incorporate ScalaTest into my Java project; replacing all JUnit tests with ScalaTests. At one point ... that way in Scala? See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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153 views

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java - Unable to decrypt String in android App

I was trying to develop an android application that could encrypt and decrypt values. So I have followed this link enter ... b & 0x0f)); } } See Question&Answers more detail:os...

asked Oct 24, 2021 in Technique[技术] by 深蓝 (71.8m points)

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