java-9

问题 There are a lot of questions around about illegal reflective access in Java 9. Now what I can't find because all Google spews up is people trying to work around the error messages, is what an illegal reflective access actually is. So my question fairly simple is: What defines an illegal reflective access and what circumstances trigger the warning? I have gathered that it has something to do with the encapsulation principles that were introduced in Java 9, but how it all hangs together and

问题 There are a lot of questions around about illegal reflective access in Java 9. Now what I can't find because all Google spews up is people trying to work around the error messages, is what an illegal reflective access actually is. So my question fairly simple is: What defines an illegal reflective access and what circumstances trigger the warning? I have gathered that it has something to do with the encapsulation principles that were introduced in Java 9, but how it all hangs together and

问题 As per the documentation, There’s also the option to load a script on startup, including some special predefined options. These are specified using the —startup flag, passing in either a filename or one of: DEFAULT – load the default behavior. This acts the same as if this is not specified at all JAVASE – Imports all Java SE packages by default PRINTING – defines the functions print, println and printf for use But, when i started the jshell with DEFAULT, JAVASE or PRINTING options, i could

问题 As per the documentation, There’s also the option to load a script on startup, including some special predefined options. These are specified using the —startup flag, passing in either a filename or one of: DEFAULT – load the default behavior. This acts the same as if this is not specified at all JAVASE – Imports all Java SE packages by default PRINTING – defines the functions print, println and printf for use But, when i started the jshell with DEFAULT, JAVASE or PRINTING options, i could

问题 I've got a maven project that uses Java 9 . It imported into IntelliJ IDEA 2017.2.3 Community . But for some reason it cannot find standard java classes like String or Float . For example When I try to Setup Project JDK it changes nothing What is the problem? module-info looks like this module com.lapots.breed.platform.cloud.javacloudsample { requires spring.boot; requires hibernate.jpa; requires spring.web; requires spring.boot.autoconfigure; } Project itself is there java-cloud-sample 来源：

问题 I've got a maven project that uses Java 9 . It imported into IntelliJ IDEA 2017.2.3 Community . But for some reason it cannot find standard java classes like String or Float . For example When I try to Setup Project JDK it changes nothing What is the problem? module-info looks like this module com.lapots.breed.platform.cloud.javacloudsample { requires spring.boot; requires hibernate.jpa; requires spring.web; requires spring.boot.autoconfigure; } Project itself is there java-cloud-sample 来源：

问题 util.zip.ZipException: zip END header not found exception when try to load javafx fxml view in java-9. Details My Application is a Javafx (uses fxml view ) which is built and compiled using java-8(jdk-8 64-bit) and accessed as a WebStart with jre-9(64-bit). Webpages(xhtml) are loaded and rendered in this javafx application. Also note that There are already two similar bugs reported (ie. JDK-8170276, JDK-8172872) and these two bugs mentioned that the issue is not reproducible with latest java

问题 In Java, when I create a set with Set.of() or a map with Map.of() what is the time complexity of the contains and get operations? Is it O(1)? 回答1: The Set.of and Map.of APIs return instances of JDK-private implementations. The performance of these implementations is not guaranteed by the specification. However, the APIs do return specific implementations about which performance statements can be made. Thus, the question is reasonable and is distinct from a (hypothetical) question such as

问题 I am executing below code snippet System.out.println(List.of(1, 2).getClass()); System.out.println(List.of(1, 2, 3).getClass()); output of this code is; class java.util.ImmutableCollections$List2 class java.util.ImmutableCollections$ListN I am expecting java.util.ImmutableCollections$List3 as output for the second statement because there is of() method which takes three parameter, Why java creating ImmutableCollections$ListN but not ImmutableCollections$List3 ? Edited: It is Java-9 question.

问题 My context: 9-ea-113 (that is javafx now fully modularized, without jfrt.jar) eclipse-neon-M6 with the current beta support for java9 (running on java8, if that matters) win7 Something simple like import javafx.application.Application; public class FirstApplication extends Application { // } doesn't compile because the javafx.xx packages are not found. What to do? 回答1: Edit the .classpath file of the project and add the entry below - seems to work. <classpathentry kind="con" path="org.eclipse