java-10

问题 I have a substantial web-app that is built using GWT-2.5.1 and Java 8. With the deprecation of Java 8, I need to migrate this to Java 10 / 11. I've managed to get past a few issues, but I've hit one I cannot get past. When building the app, I get the following error: [INFO] Compiling module com.<xxx> [INFO] [ERROR] Unable to find type 'java.lang.Object' [INFO] [ERROR] Hint: Check that your module inherits 'com.google.gwt.core.Core' either directly or indirectly (most often by inheriting

问题 Java 10 brings a C#-like var keyword for local type-inference. But does Java 10 also provide a val keyword, as is found in Scala? val would work like var but the binding would be final . var x = "Hello, world. "; x = "abc"; // allowed val y = "Hello, world. "; y = "abc"; // forbidden If it does not, is there a reason that this is the case? 回答1: There is no val in Java 10, as stated in JEP 286: Local-Variable Type Inference: Syntax Choices There was a diversity of opinions on syntax. The two

问题 Firstly, I do realize this question has been asked in many permutations all over stackoverflow. I searched quite a bit before posting, so please don't link to another SO question unless it answers my specific question and scenario. I recently upgraded from Java 8 to 10. Now, however, I cannot view source or javadocs for any Java class or library. Makes coding a lot more cumbersome. How can I attach the source and/or javadocs for Java 10, either OpenJDK's version of it and/or Oracle's? I've

问题 Followings are the main sections of my pom.xml: properties: <properties> <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding> <project.build.targetEncoding>UTF-8</project.build.targetEncoding> <jdk.release>10</jdk.release> <jdk.vendor>oracle</jdk.vendor> <maven.compiler.source>1.10</maven.compiler.source> <maven.compiler.target>1.10</maven.compiler.target> <dependency.asm.version>6.2</dependency.asm.version> <dependency.log4j2.version>2.11.0</dependency.log4j2.version> <plugin

问题 So I'm building this music player app which plays notes which are dragged and dropped onto a JLabel. When I hit the play button, I want each note to be highlighted with a delay value corresponding to that note. I used a Swing Timer for this but the problem is, it just loops with a constant delay which is specified in the constructor. playButton.addActionListener(e -> { timerI = 0; System.out.println("Entered onAction"); Timer t = new Timer(1000, e1 -> { if (timerI < 24) { NoteLabel thisNote =

问题 I moved my RCP application from Eclipse Oxygen to Photon, and also from Java 8 to Java 10. The code compiles and the application works fine if I start it from Eclipse. However, when I try to build my application, I get an error: plug-in JavaSE_0.0.0 has not been found Missing Constraint: Bundle-RequiredExecutionEnvironment: JavaSE-10 Host plug-in JavaSE_0.0.0 has not been found. I can't find any useful solution on Google. Maybe some of you can help me. My manifest file contains this header:

问题 I installed JDK 10 to try out the new features, and I got a big hung up on var - for some reason, even though the JDK was added to IntelliJ (version 2018.1), the following code still won't compile, saying Java cannot find the symbol var : public class Variations { public static void main(String[] args) { var local = "foo"; System.out.println(local); } } Am I missing something obvious here, or is there an option in IntelliJ I should enable? EDIT: Both project and module SDK and Language Level

问题 Following the link Upgrade to Java 10 breaks links in Javadoc comments to JDK packages and trying to reproduce the same while I could set the build configuration to : <build> <plugins> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.7.0</version> <configuration> <source>9</source> <target>9</target> </configuration> <dependencies> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm</artifactId> <version>6.1</version> <

问题 I've installed the version 2018.1 of IntelliJ IDEA (COMMUNITY EDITION) , which added support for Java 10 . When I tried to use new "var" to type local variable, the IDE highlights it with red colour and the lovely phrase: "Cannot resolve the type "var". Please see attachment varRed I've read another post that happens exactly the same issue in which a member gave a possible solution https://stackoverflow.com/a/49719734/9478809 I've done that as well, I've created a live template for that type

问题 Since upgrading to install4j 7.0.5 and Java 10, users that run our application on Windows more and more often report that the application throws java.lang.NoSuchMethodError: <init> at javafx.graphics/com.sun.glass.ui.win.WinApplication.staticScreen_getScreens(Native Method) at javafx.graphics/com.sun.glass.ui.Screen.initScreens(Unknown Source) at javafx.graphics/com.sun.glass.ui.Application.lambda$run$1(Unknown Source) at javafx.graphics/com.sun.glass.ui.win.WinApplication._runLoop(Native