Recent questions tagged JAVA

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java - Moving from JDK 1.7 to JDK 1.8 on Ubuntu

I am on UBUNTU. JDK version currently installed is: java version "1.7.0_51" Java(TM) SE Runtime Environment ... explicitly use the tar.gz. 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 - What is the difference between DVM and JVM?

What is difference between Java Virtual Machine and Dalvik Virtual Machine? 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 - Installing Oracle JDK on Windows subsystem for Linux

When trying to use the Linux version of Oracle's JDK on the latest Windows 10 build having support for bash, ... . Anyone got this working yet? 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 go back in Eclipse?

Is there a way to go back in Eclipse? Basically, when I'm jumping around a big project following the execution ... me back to the calling code? 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 - Long vs Integer, long vs int, what to use and when?

Sometimes I see API's using long or Long or int or Integer, and I can't figure how the decision is made for that? When should I choose what? See Question&Answers more detail:os...

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

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321 views

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java - Hashmap holding different data types as values for instance Integer, String and Object

I need to create a hashmap with key as integer and it should hold multiple values of different data types. For ... single key into the hashmap? 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 get default ZoneOffset in java8?

With java8 we know use ZoneId.default() can get system default ZoneId, but how to get default ZoneOffset? I ... have more than one ZoneOffset? 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 use @Nullable and @Nonnull annotations more effectively?

I can see that @Nullable and @Nonnull annotations could be helpful in preventing NullPointerExceptions but they do ... /or propagate further? 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 add reference to a method parameter in javadoc?

Is there a way to add references to one or more of a method's parameters from the method documentation body? Something like: ... a, int b) {...} 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 - Erlang's let-it-crash philosophy - applicable elsewhere?

Erlang's (or Joe Armstrong's?) advice NOT to use defensive programming and to let processes crash (rather than ... the .NET or Java space? See Question&Answers more detail:os...

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

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280 views

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java - Checkstyle vs. PMD

We are introducing static analysis tools into the build system for our Java product. We are using Maven2 so ... to enforce architectural rules. See Question&Answers more detail:os...

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

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228 views

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java - Why would iterating over a List be faster than indexing through it?

Reading the Java documentation for the ADT List it says: The List interface provides four methods for positional ... conclusion which is drawn. 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 test a component / bean in Spring Boot

To test a component/bean in a Spring Boot application, the testing part of the Spring Boot documentation ... annotation rather than another. See Question&Answers more detail:os...

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

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291 views

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java - How do I prevent Spring 3.0 MVC @ModelAttribute variables from appearing in URL?

Using Spring MVC 3.0.0.RELEASE, I have the following Controller: @Controller @RequestMapping("/addIntake.htm") public ... showing up in the URL? See Question&Answers more detail:os...

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

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328 views

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java - Correct way to initialize HashMap and can HashMap hold different value types?

So I have two questions about HashMaps in Java: What is the correct way to initialize a HashMap? I think it ... as a value within a HashMap? See Question&Answers more detail:os...

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

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194 views

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java - Securing Spring Boot API with API key and secret

I would like to secure the Spring Boot API so it is accessible only for the clients that has valid API key and ... I achieve this? Thank you! See Question&Answers more detail:os...

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

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219 views

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java - How to sort 100GB worth of strings

Given a harddrive with 120GB, 100 of which are filled with the strings of length 256 and 2 GB Ram how do ... ? How long will it take? See Question&Answers more detail:os...

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

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126 views

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java - Asynchronous programming best practices

I have recently written my first Android app which was roughly 8,000-10,000 lines of code. One ... for writing manageable asynchronous code? See Question&Answers more detail:os...

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

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408 views

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java - Difference between logger.info and logger.debug

What is the difference between logger.debug and logger.info ? When will logger.debug be printed? See Question&Answers more detail:os...

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

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611 views

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java - CompletableFuture | thenApply vs thenCompose

I can't get my head around the difference between thenApply() and thenCompose(). So, could someone provide ... thenApply and when thenCompose? See Question&Answers more detail:os...

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

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249 views

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java - Mockito + PowerMock LinkageError while mocking system class

I've got such a code snippet: @RunWith(PowerMockRunner.class) @PrepareForTest({Thread.class}) public class ... classLoader.getResources(path); See Question&Answers more detail:os...

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

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463 views

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java - How can I disable the Maven Javadoc plugin from the command line?

In pom.xml I have declaration like this <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-javadoc- ... is not what I want. See Question&Answers more detail:os...

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

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113 views

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java - Bad idea to use String key in HashMap?

I understand that the String class' hashCode() method is not guarantied to generate unique hash codes for distinct ... the key is a String? See Question&Answers more detail:os...

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

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422 views

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java - Base64 vs HEX for sending binary content over the internet in XML doc

What is the best way of sending binary content between system inside an XML document I know of Base64 and Hex ... could just create a function. See Question&Answers more detail:os...

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

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272 views

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java - Implement a simple factory pattern with Spring 3 annotations

I was wondering how I could implement the simple factory pattern with Spring 3 annotations. I saw in the ... make this work correctly? Thanks See Question&Answers more detail:os...

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

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355 views

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java - How do I run IDEA IntelliJ on Mac OS X with JDK 7?

I use Mac OS X 10.8.2, and use JDK 7. Now I downloaded the latest version of IDEA IntelliJ, 11. But it ... IntelliJ on Mac OS X with JDK 7? See Question&Answers more detail:os...

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

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281 views

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java - Why would I use a templating engine? jsp include and jstl vs tiles, freemarker, velocity, sitemesh

I'm about to choose to way to organize my view (with spring-mvc, but that shouldn't matter much) There are ... of/in addition to plain JSP. See Question&Answers more detail:os...

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

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268 views

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java - Can Mockito stub a method without regard to the argument?

I'm trying to test some legacy code, using Mockito. I want to stub a FooDao that is used in production ... there is reasonable test coverage. See Question&Answers more detail:os...

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

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